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From: Dipen Patel <dipenp@nvidia.com>
To: <smangipudi@nvidia.com>, <thierry.reding@gmail.com>,
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CC: Dipen Patel <dipenp@nvidia.com>
Subject: [RFC v4 01/11] Documentation: Add HTE subsystem guide
Date: Mon, 17 Jan 2022 16:22:04 -0800
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Adding hte document which can help understand various APIs implemented
in HTE framework for the HTE producers and the consumers.

Signed-off-by: Dipen Patel <dipenp@nvidia.com>
---
Changes in v2:
- Removed explanation, instead added kernel-doc references.

Changes in v3:
- Addressed grammatical errors.

Changes in v4:
- Added new API hte_req_ts_by_linedata_ns description.
- Removed hte_req_ts_by_hte_name.

 Documentation/hte/hte.rst | 83 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 Documentation/hte/hte.rst

diff --git a/Documentation/hte/hte.rst b/Documentation/hte/hte.rst
new file mode 100644
index 000000000000..f82113e540b8
--- /dev/null
+++ b/Documentation/hte/hte.rst
@@ -0,0 +1,83 @@
+============================================
+The Linux Hardware Timestamping Engine (HTE)
+============================================
+
+:Author: Dipen Patel
+
+Introduction
+------------
+
+Certain devices have built in hardware timestamping engines which can
+monitor sets of system signals, lines, buses etc... in realtime for state
+change; upon detecting the change they can automatically store the timestamp at
+the moment of occurrence. Such functionality may help achieve better accuracy
+in obtaining timestamps than using software counterparts i.e. ktime and
+friends.
+
+This document describes the API that can be used by hardware timestamping
+engine provider and consumer drivers that want to use the hardware timestamping
+engine (HTE) framework. Both consumers and providers must include
+#include <linux/hte.h>.
+
+The HTE framework APIs for the providers
+----------------------------------------
+
+.. kernel-doc:: drivers/hte/hte.c
+   :functions: devm_hte_register_chip hte_push_ts_ns
+
+The HTE framework APIs for the consumers
+----------------------------------------
+
+.. kernel-doc:: drivers/hte/hte.c
+   :functions: devm_of_hte_request_ts_ns hte_req_ts_by_linedata_ns hte_release_ts hte_enable_ts hte_disable_ts hte_get_clk_src_info
+
+The HTE framework public structures
+-----------------------------------
+.. kernel-doc:: include/linux/hte.h
+
+More on the HTE timestamp data
+------------------------------
+The struct hte_ts_data is used to pass timestamp details between the consumers
+and the providers. It expresses timestamp data in nanoseconds in u64 data
+type. For now all the HTE APIs using struct hte_ts_data require tsc to be in
+nanoseconds. An example of the typical hte_ts_data data life cycle, for the
+GPIO line is as follows::
+
+ - Monitors GPIO line change.
+ - Detects the state change on GPIO line.
+ - Converts timestamps in nanoseconds and stores it in tsc.
+ - Stores GPIO raw level in raw_level variable if the provider has that
+ hardware capability.
+ - Pushes this hte_ts_data object to HTE subsystem.
+ - HTE subsystem increments seq counter and invokes consumer provided callback.
+ Based on callback return value, the HTE starts a kernel thread and invokes
+ secondary callback in the thread context.
+
+HTE subsystem debugfs attributes
+--------------------------------
+HTE subsystem creates debugfs attributes at ``/sys/kernel/debug/hte/``.
+It also creates line/signal-related debugfs attributes at
+``/sys/kernel/debug/hte/<provider>/<label or line id>/``.
+
+`ts_requested`
+		The total number of entities requested from the given provider,
+		where entity is specified by the provider and could represent
+		lines, GPIO, chip signals, buses etc...
+                The attribute will be available at
+		``/sys/kernel/debug/hte/<provider>/``.
+
+		Read-only value
+
+`total_ts`
+		The total number of entities supported by the provider.
+                The attribute will be available at
+		``/sys/kernel/debug/hte/<provider>/``.
+
+		Read-only value
+
+`dropped_timestamps`
+		The dropped timestamps for a given line.
+                The attribute will be available at
+		``/sys/kernel/debug/hte/<provider>/<label or line id>/``.
+
+		Read-only value

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From: Dipen Patel <dipenp@nvidia.com>
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CC: Dipen Patel <dipenp@nvidia.com>
Subject: [RFC v4 02/11] drivers: Add hardware timestamp engine (HTE)
Date: Mon, 17 Jan 2022 16:22:05 -0800
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Some devices can timestamp system lines/signals/Buses in real-time
using the hardware counter or other hardware means which can give
finer granularity and help avoid jitter introduced by software
timestamping. To utilize such functionality, this patchset creates
HTE subsystem where devices can register themselves as providers so
that the consumers devices can request specific line from the
providers.

It provides below APIs for the provider:
- devm_hte_register_chip -- To register the HTE provider.
- hte_push_ts_ns() -- To push timestamp data into HTE subsystem.

It provides below APIs for the consumer:
- devm_of_hte_request_ts_ns() -- Request timestamp functionality.
- hte_req_ts_by_linedata_ns -- To request timestamp functionality by
using line data information provided by the consumer.
- hte_enable_ts() -- To disable timestamp functionality.
- hte_disable_ts() -- To enable timestamp functionality.
- hte_release_ts() -- To release timestamp functionality and its
associated resources.
- hte_get_clk_src_info() -- To query clock source information from
the provider

The detail about parameters and API usage are described in each
functions definitions in drivers/hte/hte.c file.

The patch adds compilation support in Makefile and menu options in
Kconfig.

Signed-off-by: Dipen Patel <dipenp@nvidia.com>
Reported-by: kernel test robot <lkp@intel.com>
---
Changes in v2:
- Removed buffer abstraction layer as well related APIs, HTE now will not store
any data, instead will pass to consumer as soon as it is available.
- Removed unnecessary dynamical allocations
- Removed timestamp retrieve API
- Removed release, unregister related APIs as their counterpart are resource
managed.
- Added kernel thread implementation if consumer indicates threaded callback
during request API time.
- Changed hte_req_ts_by_dt_node API to remove device node exposure from the
interface, instead consumer will their device node with property name that
indicates the provider it wants to use.

Changes in v3:
- Addressed grammatical/spelling errors.

Changes in v4:
- Added hte_req_ts_by_linedata_ns and removed hte_req_ts_by_hte_name.
- Corrected API descriptions based on review comments.
- Droped HTE_CB_ERROR and HTE_CB_TS_DROPPED enums.
- Added line attribute structure in hte ts descriptor.
- Added raw_level field in hte ts data structure.
- Added match_from_linedata callback for the providers.
- Added edge setup related flags should consumer requests, HTE now
can help setup should provider supports it.

 drivers/Kconfig      |   2 +
 drivers/Makefile     |   1 +
 drivers/hte/Kconfig  |  22 ++
 drivers/hte/Makefile |   2 +
 drivers/hte/hte.c    | 887 +++++++++++++++++++++++++++++++++++++++++++
 include/linux/hte.h  | 250 ++++++++++++
 6 files changed, 1164 insertions(+)
 create mode 100644 drivers/hte/Kconfig
 create mode 100644 drivers/hte/Makefile
 create mode 100644 drivers/hte/hte.c
 create mode 100644 include/linux/hte.h

diff --git a/drivers/Kconfig b/drivers/Kconfig
index 0d399ddaa185..b3c8332bf5c7 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -236,4 +236,6 @@ source "drivers/interconnect/Kconfig"
 source "drivers/counter/Kconfig"
 
 source "drivers/most/Kconfig"
+
+source "drivers/hte/Kconfig"
 endmenu
diff --git a/drivers/Makefile b/drivers/Makefile
index a110338c860c..bb06fd70cc2f 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -187,3 +187,4 @@ obj-$(CONFIG_GNSS)		+= gnss/
 obj-$(CONFIG_INTERCONNECT)	+= interconnect/
 obj-$(CONFIG_COUNTER)		+= counter/
 obj-$(CONFIG_MOST)		+= most/
+obj-$(CONFIG_HTE)		+= hte/
diff --git a/drivers/hte/Kconfig b/drivers/hte/Kconfig
new file mode 100644
index 000000000000..1fcfe17cf28a
--- /dev/null
+++ b/drivers/hte/Kconfig
@@ -0,0 +1,22 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menuconfig HTE
+	bool "Hardware Timestamping Engine (HTE) Support"
+	help
+	  Hardware Timestamping Engine (HTE) Support.
+
+	  Some devices provide a hardware timestamping engine which can
+	  timestamp certain device lines/signals in realtime. This provides a
+	  hardware-assisted timestamp to generic signals like GPIOs or IRQs
+	  lines. It comes with a benefit for applications like autonomous
+	  machines needing accurate timestamping event with less jitter.
+
+	  This framework provides a generic interface to such HTE devices
+	  within the Linux kernel. It provides an API to register and
+	  unregister a HTE provider chip, configurable software buffer to
+	  store the timestamps, push the timestamp from the HTE providers and
+	  retrieve timestamps for the consumers. It also provides means for the
+	  consumers to request signals it wishes to hardware timestamp and
+	  release them if not required.
+
+	  If unsure, say no.
+
diff --git a/drivers/hte/Makefile b/drivers/hte/Makefile
new file mode 100644
index 000000000000..fc03bdf44427
--- /dev/null
+++ b/drivers/hte/Makefile
@@ -0,0 +1,2 @@
+obj-$(CONFIG_HTE)		+= hte.o
+
diff --git a/drivers/hte/hte.c b/drivers/hte/hte.c
new file mode 100644
index 000000000000..8534f5219660
--- /dev/null
+++ b/drivers/hte/hte.c
@@ -0,0 +1,887 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2021-2022 NVIDIA Corporation
+ *
+ * Author: Dipen Patel <dipenp@nvidia.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/mutex.h>
+#include <linux/sched.h>
+#include <linux/uaccess.h>
+#include <linux/hte.h>
+#include <linux/delay.h>
+#include <linux/debugfs.h>
+#include <linux/kthread.h>
+
+#define HTE_TS_NAME_LEN		10
+
+/* Global list of the HTE devices */
+static DEFINE_SPINLOCK(hte_lock);
+static LIST_HEAD(hte_devices);
+
+enum {
+	HTE_TS_REGISTERED,
+	HTE_TS_DISABLE,
+};
+
+enum {
+	HTE_CB_RUN_THREAD,
+	HTE_CB_NUM,
+};
+
+/**
+ * struct hte_ts_info - Information related to requested timestamp.
+ *
+ * @xlated_id: Timestamp ID as understood between HTE subsys and HTE provider,
+ * See xlate callback API.
+ * @flags: Flags holding state informations.
+ * @hte_cb_flags: Callback related flags.
+ * @seq: Timestamp sequence counter.
+ * @line_name: HTE allocated line name.
+ * @cb: Callback function provided by clients.
+ * @tcb: Threaded callback function provided by clients.
+ * @dropped_ts: Dropped timestamps.
+ * @slock: Spin lock to synchronize between disable/enable,
+ * request/release APIs.
+ * @thread: Thread task when tcb is provided.
+ * @req_mlock: Lock during timestamp request/release APIs.
+ * @ts_dbg_root: Root for the debug fs.
+ * @gdev: HTE abstract device that this timestamp information belongs to.
+ * @cl_data: Client specific data.
+ */
+struct hte_ts_info {
+	u32 xlated_id;
+	unsigned long flags;
+	unsigned long hte_cb_flags;
+	u64 seq;
+	char *line_name;
+	hte_ts_cb_t cb;
+	hte_ts_threaded_cb_t tcb;
+	atomic_t dropped_ts;
+	spinlock_t slock;
+	struct task_struct *thread;
+	struct mutex req_mlock;
+	struct dentry *ts_dbg_root;
+	struct hte_device *gdev;
+	void *cl_data;
+};
+
+/**
+ * struct hte_device - HTE abstract device
+ * @nlines: Number of entities this device supports.
+ * @ts_req: Total number of entities requested.
+ * @sdev: Device used at various debug prints.
+ * @dbg_root: Root directory for debug fs.
+ * @list: List node to store hte_device for each provider.
+ * @chip: HTE chip providing this HTE device.
+ * @owner: helps prevent removal of modules when in use.
+ * @ei: Timestamp information.
+ */
+struct hte_device {
+	u32 nlines;
+	atomic_t ts_req;
+	struct device *sdev;
+	struct dentry *dbg_root;
+	struct list_head list;
+	struct hte_chip *chip;
+	struct module *owner;
+	struct hte_ts_info ei[];
+};
+
+#ifdef CONFIG_DEBUG_FS
+
+static struct dentry *hte_root;
+
+static int __init hte_subsys_dbgfs_init(void)
+{
+	/* creates /sys/kernel/debug/hte/ */
+	hte_root = debugfs_create_dir("hte", NULL);
+
+	return 0;
+}
+subsys_initcall(hte_subsys_dbgfs_init);
+
+static void hte_chip_dbgfs_init(struct hte_device *gdev)
+{
+	const struct hte_chip *chip = gdev->chip;
+	const char *name = chip->name ? chip->name : dev_name(chip->dev);
+
+	gdev->dbg_root = debugfs_create_dir(name, hte_root);
+
+	debugfs_create_atomic_t("ts_requested", 0444, gdev->dbg_root,
+				&gdev->ts_req);
+	debugfs_create_u32("total_ts", 0444, gdev->dbg_root,
+			   &gdev->nlines);
+}
+
+static void hte_ts_dbgfs_init(const char *name, struct hte_ts_info *ei)
+{
+	if (!ei->gdev->dbg_root || !name)
+		return;
+
+	ei->ts_dbg_root = debugfs_create_dir(name, ei->gdev->dbg_root);
+
+	debugfs_create_atomic_t("dropped_timestamps", 0444, ei->ts_dbg_root,
+				&ei->dropped_ts);
+}
+
+#else
+
+static void hte_chip_dbgfs_init(struct hte_device *gdev)
+{
+}
+
+static void hte_ts_dbgfs_init(const char *name, struct hte_ts_info *ei)
+{
+}
+
+#endif
+
+/**
+ * hte_release_ts() - Release and disable timestamp for the given desc.
+ *
+ * @desc: timestamp descriptor.
+ *
+ * Context: debugfs_remove_recursive() function call may use sleeping locks,
+ *	    not suitable from atomic context.
+ * Returns: 0 on success or a negative error code on failure.
+ */
+int hte_release_ts(struct hte_ts_desc *desc)
+{
+	int ret = 0;
+	unsigned long flag;
+	struct hte_device *gdev;
+	struct hte_ts_info *ei;
+
+	if (!desc)
+		return -EINVAL;
+
+	ei = desc->hte_data;
+
+	if (!ei || !ei->gdev)
+		return -EINVAL;
+
+	gdev = ei->gdev;
+
+	mutex_lock(&ei->req_mlock);
+
+	if (!test_bit(HTE_TS_REGISTERED, &ei->flags)) {
+		dev_info(gdev->sdev, "id:%d is not registered",
+			 desc->attr.line_id);
+		ret = -EUSERS;
+		goto unlock;
+	}
+
+	ret = gdev->chip->ops->release(gdev->chip, desc, ei->xlated_id);
+	if (ret) {
+		dev_err(gdev->sdev, "id: %d free failed\n",
+			desc->attr.line_id);
+		goto unlock;
+	}
+
+	kfree(ei->line_name);
+
+	debugfs_remove_recursive(ei->ts_dbg_root);
+
+	spin_lock_irqsave(&ei->slock, flag);
+
+	atomic_dec(&gdev->ts_req);
+	atomic_set(&ei->dropped_ts, 0);
+
+	ei->seq = 1;
+	desc->hte_data = NULL;
+
+	clear_bit(HTE_TS_REGISTERED, &ei->flags);
+
+	spin_unlock_irqrestore(&ei->slock, flag);
+
+	if (ei->tcb) {
+		kthread_stop(ei->thread);
+		put_task_struct(ei->thread);
+	}
+
+	ei->cb = NULL;
+	ei->tcb = NULL;
+	ei->thread = NULL;
+	ei->cl_data = NULL;
+
+	module_put(gdev->owner);
+unlock:
+	mutex_unlock(&ei->req_mlock);
+	dev_dbg(gdev->sdev, "release id: %d\n", desc->attr.line_id);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(hte_release_ts);
+
+static int hte_ts_dis_en_common(struct hte_ts_desc *desc, bool en)
+{
+	u32 ts_id;
+	struct hte_device *gdev;
+	struct hte_ts_info *ei;
+	int ret;
+	unsigned long flag;
+
+	if (!desc)
+		return -EINVAL;
+
+	ei = desc->hte_data;
+
+	if (!ei || !ei->gdev)
+		return -EINVAL;
+
+	gdev = ei->gdev;
+	ts_id = desc->attr.line_id;
+
+	mutex_lock(&ei->req_mlock);
+
+	if (!test_bit(HTE_TS_REGISTERED, &ei->flags)) {
+		dev_dbg(gdev->sdev, "id:%d is not registered", ts_id);
+		ret = -EUSERS;
+		goto out;
+	}
+
+	spin_lock_irqsave(&ei->slock, flag);
+
+	if (en) {
+		if (!test_bit(HTE_TS_DISABLE, &ei->flags)) {
+			ret = 0;
+			goto out_unlock;
+		}
+
+		spin_unlock_irqrestore(&ei->slock, flag);
+		ret = gdev->chip->ops->enable(gdev->chip, ei->xlated_id);
+		if (ret) {
+			dev_warn(gdev->sdev, "id: %d enable failed\n",
+				 ts_id);
+			goto out;
+		}
+
+		spin_lock_irqsave(&ei->slock, flag);
+		clear_bit(HTE_TS_DISABLE, &ei->flags);
+	} else {
+		if (test_bit(HTE_TS_DISABLE, &ei->flags)) {
+			ret = 0;
+			goto out_unlock;
+		}
+
+		spin_unlock_irqrestore(&ei->slock, flag);
+		ret = gdev->chip->ops->disable(gdev->chip, ei->xlated_id);
+		if (ret) {
+			dev_warn(gdev->sdev, "id: %d disable failed\n",
+				 ts_id);
+			goto out;
+		}
+
+		spin_lock_irqsave(&ei->slock, flag);
+		set_bit(HTE_TS_DISABLE, &ei->flags);
+	}
+
+out_unlock:
+	spin_unlock_irqrestore(&ei->slock, flag);
+out:
+	mutex_unlock(&ei->req_mlock);
+	return ret;
+}
+
+/**
+ * hte_disable_ts() - Disable timestamp on given descriptor.
+ *
+ * The API does not release any resources associated with desc.
+ *
+ * @desc: ts descriptor, this is the same as returned by the request API.
+ *
+ * Context: Holds mutex lock, not suitable from atomic context.
+ * Returns: 0 on success or a negative error code on failure.
+ */
+int hte_disable_ts(struct hte_ts_desc *desc)
+{
+	return hte_ts_dis_en_common(desc, false);
+}
+EXPORT_SYMBOL_GPL(hte_disable_ts);
+
+/**
+ * hte_enable_ts() - Enable timestamp on given descriptor.
+ *
+ * @desc: ts descriptor, this is the same as returned by the request API.
+ *
+ * Context: Holds mutex lock, not suitable from atomic context.
+ * Returns: 0 on success or a negative error code on failure.
+ */
+int hte_enable_ts(struct hte_ts_desc *desc)
+{
+	return hte_ts_dis_en_common(desc, true);
+}
+EXPORT_SYMBOL_GPL(hte_enable_ts);
+
+static int hte_simple_xlate(struct hte_chip *gc,
+			    const struct of_phandle_args *args,
+			    struct hte_ts_desc *desc,
+			    u32 *id)
+{
+	if (!id || !desc || !gc)
+		return -EINVAL;
+
+	/*
+	 * For the providers that do not have any internal mappings between
+	 * logically exposed ids and actual ids, will set both
+	 * the same.
+	 *
+	 * In case there is a internal mapping needed, providers will need to
+	 * provide its own xlate function where line_id will be sent as
+	 * args[0] and it will return xlated id. Later xlated id will be
+	 * used for any future exchanges between provider and subsystems.
+	 */
+
+	if (args) {
+		if (gc->of_hte_n_cells < 1)
+			return -EINVAL;
+
+		if (args->args_count != gc->of_hte_n_cells)
+			return -EINVAL;
+
+		*id = args->args[0];
+		desc->attr.line_id = *id;
+	} else {
+		*id = desc->attr.line_id;
+	}
+
+	if (desc->attr.line_id > gc->nlines)
+		return -EINVAL;
+
+	desc->hte_data = NULL;
+
+	return 0;
+}
+
+static int _hte_wait_for_ts_data(struct hte_ts_info *ei)
+{
+	for (;;) {
+		set_current_state(TASK_INTERRUPTIBLE);
+
+		if (kthread_should_stop()) {
+			if (test_and_clear_bit(HTE_CB_RUN_THREAD,
+			    &ei->hte_cb_flags)) {
+				__set_current_state(TASK_RUNNING);
+				return 0;
+			}
+			__set_current_state(TASK_RUNNING);
+			return -1;
+		}
+
+		if (test_and_clear_bit(HTE_CB_RUN_THREAD,
+				       &ei->hte_cb_flags)) {
+			__set_current_state(TASK_RUNNING);
+			return 0;
+		}
+		schedule();
+	}
+}
+
+static int _hte_threadfn(void *data)
+{
+	struct hte_ts_info *ei = data;
+
+	while (!_hte_wait_for_ts_data(ei))
+		ei->tcb(ei->cl_data);
+
+	return 0;
+}
+
+static int _hte_setup_thread(struct hte_ts_info *ei, u32 id)
+{
+	struct task_struct *t;
+
+	t = kthread_create(_hte_threadfn, ei, "hte-%u", id);
+	if (IS_ERR(t))
+		return PTR_ERR(t);
+
+	ei->thread = get_task_struct(t);
+
+	return 0;
+}
+
+static int ___hte_req_ts(struct hte_device *gdev, struct hte_ts_desc *desc,
+			 u32 xlated_id, hte_ts_cb_t cb,
+			 hte_ts_threaded_cb_t tcb, void *data)
+{
+	struct hte_ts_info *ei;
+	int ret;
+
+	if (!try_module_get(gdev->owner))
+		return -ENODEV;
+
+	ei = &gdev->ei[xlated_id];
+	ei->xlated_id = xlated_id;
+
+	/*
+	 * There is a chance that multiple consumers requesting same entity,
+	 * lock here.
+	 */
+	mutex_lock(&ei->req_mlock);
+
+	if (test_bit(HTE_TS_REGISTERED, &ei->flags)) {
+		dev_dbg(gdev->chip->dev, "id:%u is already registered",
+			xlated_id);
+		ret = -EUSERS;
+		goto unlock;
+	}
+
+	ei->cb = cb;
+	ei->tcb = tcb;
+	if (tcb) {
+		ret = _hte_setup_thread(ei, xlated_id);
+		if (ret < 0) {
+			dev_err(gdev->chip->dev, "setting thread failed\n");
+			goto unlock;
+		}
+	}
+
+	ret = gdev->chip->ops->request(gdev->chip, desc, xlated_id);
+	if (ret < 0) {
+		dev_err(gdev->chip->dev, "ts request failed\n");
+		goto unlock;
+	}
+
+	desc->hte_data = ei;
+	ei->cl_data = data;
+	ei->seq = 1;
+
+	atomic_inc(&gdev->ts_req);
+
+	ei->line_name = NULL;
+	if (!desc->attr.name) {
+		ei->line_name = kzalloc(HTE_TS_NAME_LEN, GFP_KERNEL);
+		if (ei->line_name)
+			scnprintf(ei->line_name, HTE_TS_NAME_LEN, "ts_%u",
+				  desc->attr.line_id);
+	}
+
+	hte_ts_dbgfs_init(desc->attr.name == NULL ?
+			  ei->line_name : desc->attr.name, ei);
+	set_bit(HTE_TS_REGISTERED, &ei->flags);
+
+	mutex_unlock(&ei->req_mlock);
+
+	dev_dbg(gdev->chip->dev, "id: %u, xlated id:%u",
+		desc->attr.line_id, xlated_id);
+
+	return 0;
+
+unlock:
+	module_put(gdev->owner);
+	mutex_unlock(&ei->req_mlock);
+
+	return ret;
+}
+
+static struct hte_device *of_node_to_htedevice(struct device_node *np)
+{
+	struct hte_device *gdev;
+
+	spin_lock(&hte_lock);
+
+	list_for_each_entry(gdev, &hte_devices, list)
+		if (gdev->chip && gdev->chip->dev &&
+		    gdev->chip->dev->of_node == np) {
+			spin_unlock(&hte_lock);
+			return gdev;
+		}
+
+	spin_unlock(&hte_lock);
+
+	return ERR_PTR(-ENODEV);
+}
+
+static struct hte_device *hte_find_dev_from_linedata(struct hte_ts_desc *desc)
+{
+	struct hte_device *gdev;
+
+	spin_lock(&hte_lock);
+
+	list_for_each_entry(gdev, &hte_devices, list)
+		if (gdev->chip && gdev->chip->match_from_linedata) {
+			if (!gdev->chip->match_from_linedata(gdev->chip, desc))
+				continue;
+			spin_unlock(&hte_lock);
+			return gdev;
+		}
+
+	spin_unlock(&hte_lock);
+
+	return ERR_PTR(-ENODEV);
+}
+
+static struct hte_device *of_hte_dev_get(struct device *dev,
+					 struct device_node *np,
+					 const char *label,
+					 struct of_phandle_args *args)
+{
+	struct hte_device *gdev = NULL;
+	int index = 0;
+	int err;
+
+	if (label) {
+		index = of_property_match_string(np,
+						 "hardware-timestamp-names",
+						 label);
+		if (index < 0)
+			return ERR_PTR(index);
+	}
+
+	err = of_parse_phandle_with_args(np, "hardware-timestamps",
+					 "#hardware-timestamp-cells", index,
+					 args);
+	if (err) {
+		pr_err("%s(): can't parse \"hardware-timestamps\" property\n",
+		       __func__);
+		return ERR_PTR(err);
+	}
+
+	gdev = of_node_to_htedevice(args->np);
+	if (IS_ERR(gdev)) {
+		pr_err("%s(): HTE chip not found\n", __func__);
+		of_node_put(args->np);
+		return gdev;
+	}
+
+	return gdev;
+}
+
+static int __hte_req_ts(struct device *dev, struct hte_ts_desc *desc,
+			hte_ts_cb_t cb, hte_ts_threaded_cb_t tcb, void *data)
+{
+	struct hte_device *gdev = NULL;
+	struct of_phandle_args args;
+	int ret;
+	u32 xlated_id;
+
+	gdev = of_hte_dev_get(dev, dev->of_node, desc->attr.name, &args);
+	if (IS_ERR(gdev))
+		return PTR_ERR(gdev);
+
+	if (!gdev->chip) {
+		pr_debug("requested id does not have provider\n");
+		return -ENODEV;
+	}
+
+	ret = gdev->chip->xlate(gdev->chip, &args, desc, &xlated_id);
+	if (ret < 0)
+		goto put;
+
+	ret = ___hte_req_ts(gdev, desc, xlated_id, cb, tcb, data);
+	if (ret < 0)
+		goto put;
+
+	return 0;
+
+put:
+	of_node_put(args.np);
+
+	return ret;
+}
+
+static void __devm_hte_release_ts(void *res)
+{
+	hte_release_ts(res);
+}
+
+/**
+ * devm_of_hte_request_ts_ns() - Resource managed API to request hardware
+ * timestamp in nanoseconds.
+ *
+ * The entity is provider specific for example, GPIO lines, signals, buses
+ * etc...The API allocates necessary resources and enables the timestamp. It
+ * deallocates and disables automatically when the consumer exits.
+ *
+ * @dev: HTE consumer/client device.
+ * @desc: Pre-allocated timestamp descriptor. HTE core will fill out necessary
+ * details. The name will be used as an index to parse line_id from the device
+ * tree node.
+ * @cb: Callback to push the timestamp data to consumer.
+ * @tcb: Optional callback. If its provided, subsystem will create
+ * thread. This will be called when cb returns HTE_RUN_THREADED_CB.
+ * @data: Client data, will be sent back during cb and tcb callbacks.
+ *
+ * Context: Holds mutex lock.
+ * Returns: Returns 0 on success or negative error code on failure.
+ */
+int devm_of_hte_request_ts_ns(struct device *dev, struct hte_ts_desc *desc,
+			      hte_ts_cb_t cb, hte_ts_threaded_cb_t tcb,
+			      void *data)
+{
+	int err;
+
+	if (!dev || !dev->of_node || !desc || !cb)
+		return -EINVAL;
+
+	err = __hte_req_ts(dev, desc, cb, tcb, data);
+	if (err)
+		return err;
+
+	err = devm_add_action_or_reset(dev, __devm_hte_release_ts, desc);
+	if (err)
+		return err;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(devm_of_hte_request_ts_ns);
+
+/**
+ * hte_req_ts_by_linedata_ns() - Request entity to hardware timestamp in
+ * nanoseconds.
+ *
+ * The meaning of the entity is HTE provider specific, for example lines,
+ * signals, GPIOs, buses etc...The consumer is responsible to set line_id and
+ * supporting line_data.
+ *
+ * @desc: Pre-allocated timestamp descriptor with line_id and line_data
+ * set by the consumer.
+ * @cb: Callback to push the timestamp data to consumer.
+ * @tcb: Optional callback. If its provided, subsystem will create
+ * thread. This will be called when cb returns HTE_RUN_THREADED_CB.
+ * @data: Client data, will be sent back during cb and tcb callbacks.
+ *
+ * Context: Holds mutex lock, can not be called from atomic context. The mutex
+ * lock is used to serialize multiple consumers.
+ * Returns: returns 0 on success or negative error code on failure.
+ */
+int hte_req_ts_by_linedata_ns(struct hte_ts_desc *desc, hte_ts_cb_t cb,
+			      hte_ts_threaded_cb_t tcb, void *data)
+{
+	struct hte_device *gdev;
+	int ret;
+	u32 xlated_id;
+
+	if (!desc || !cb)
+		return -EINVAL;
+
+	gdev = hte_find_dev_from_linedata(desc);
+
+	if (IS_ERR(gdev)) {
+		pr_err("%s: HTE dev not found\n", __func__);
+		return -ENOTSUPP;
+	}
+
+	ret = gdev->chip->xlate(gdev->chip, NULL, desc, &xlated_id);
+	if (ret < 0) {
+		dev_err(gdev->chip->dev,
+			"failed to xlate id: %d\n", desc->attr.line_id);
+		return ret;
+	}
+
+	ret = ___hte_req_ts(gdev, desc, xlated_id, cb, tcb, data);
+	if (ret < 0) {
+		dev_err(gdev->chip->dev,
+			"failed to request id: %d\n", desc->attr.line_id);
+		return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(hte_req_ts_by_linedata_ns);
+
+/**
+ * hte_get_clk_src_info() - Get the clock source information for a ts
+ * descriptor.
+ *
+ * @desc: ts descriptor, same as returned from request API.
+ * @ci: The API fills this structure with the clock information data.
+ *
+ * Context: Any context.
+ * Returns: 0 on success else negative error code on failure.
+ */
+int hte_get_clk_src_info(const struct hte_ts_desc *desc,
+			 struct hte_clk_info *ci)
+{
+	struct hte_chip *chip;
+	struct hte_ts_info *ei;
+
+	if (!desc || !desc->hte_data || !ci) {
+		pr_debug("%s:%d\n", __func__, __LINE__);
+		return -EINVAL;
+	}
+
+	ei = desc->hte_data;
+	if (!ei->gdev || !ei->gdev->chip)
+		return -EINVAL;
+
+	chip = ei->gdev->chip;
+	if (!chip->ops->get_clk_src_info)
+		return -ENOTSUPP;
+
+	return chip->ops->get_clk_src_info(chip, ci);
+}
+EXPORT_SYMBOL_GPL(hte_get_clk_src_info);
+
+/**
+ * hte_push_ts_ns() - Push timestamp data in nanoseconds.
+ *
+ * It is used by the provider to push timestamp data.
+ *
+ * @chip: The HTE chip, used during the registration.
+ * @xlated_id: entity id understood by both subsystem and provider, this is
+ * obtained from xlate callback during request API.
+ * @data: timestamp data.
+ *
+ * Returns: 0 on success or a negative error code on failure.
+ */
+int hte_push_ts_ns(const struct hte_chip *chip, u32 xlated_id,
+		   struct hte_ts_data *data)
+{
+	hte_return_t ret;
+	int st = 0;
+	struct hte_ts_info *ei;
+	unsigned long flag;
+
+	if (!chip || !data || !chip->gdev)
+		return -EINVAL;
+
+	if (xlated_id > chip->nlines)
+		return -EINVAL;
+
+	ei = &chip->gdev->ei[xlated_id];
+
+	spin_lock_irqsave(&ei->slock, flag);
+
+	/* timestamp sequence counter */
+	data->seq = ei->seq++;
+
+	if (!test_bit(HTE_TS_REGISTERED, &ei->flags) ||
+	    test_bit(HTE_TS_DISABLE, &ei->flags)) {
+		dev_dbg(chip->dev, "Unknown timestamp push\n");
+		atomic_inc(&ei->dropped_ts);
+		st = -EINVAL;
+		goto unlock;
+	}
+
+	ret = ei->cb(data, ei->cl_data);
+	if (ret == HTE_RUN_THREADED_CB && ei->thread) {
+		if (test_and_set_bit(HTE_CB_RUN_THREAD, &ei->hte_cb_flags))
+			goto unlock;
+		else
+			wake_up_process(ei->thread);
+	}
+
+unlock:
+	spin_unlock_irqrestore(&ei->slock, flag);
+
+	return st;
+}
+EXPORT_SYMBOL_GPL(hte_push_ts_ns);
+
+static int hte_register_chip(struct hte_chip *chip)
+{
+	struct hte_device *gdev;
+	u32 i;
+
+	if (!chip || !chip->dev || !chip->dev->of_node)
+		return -EINVAL;
+
+	if (!chip->ops || !chip->ops->request || !chip->ops->release) {
+		dev_err(chip->dev, "Driver needs to provide ops\n");
+		return -EINVAL;
+	}
+
+	gdev = kzalloc(struct_size(gdev, ei, chip->nlines), GFP_KERNEL);
+	if (!gdev)
+		return -ENOMEM;
+
+	gdev->chip = chip;
+	chip->gdev = gdev;
+	gdev->nlines = chip->nlines;
+	gdev->sdev = chip->dev;
+
+	for (i = 0; i < chip->nlines; i++) {
+		gdev->ei[i].gdev = gdev;
+		mutex_init(&gdev->ei[i].req_mlock);
+		spin_lock_init(&gdev->ei[i].slock);
+	}
+
+	if (chip->dev->driver)
+		gdev->owner = chip->dev->driver->owner;
+	else
+		gdev->owner = THIS_MODULE;
+
+	if (!chip->xlate) {
+		chip->xlate = hte_simple_xlate;
+		/* Just a id number to monitor */
+		chip->of_hte_n_cells = 1;
+	}
+
+	of_node_get(chip->dev->of_node);
+
+	INIT_LIST_HEAD(&gdev->list);
+
+	spin_lock(&hte_lock);
+	list_add_tail(&gdev->list, &hte_devices);
+	spin_unlock(&hte_lock);
+
+	hte_chip_dbgfs_init(gdev);
+
+	dev_dbg(chip->dev, "Added hte chip\n");
+
+	return 0;
+}
+
+static int hte_unregister_chip(struct hte_chip *chip)
+{
+	struct hte_device *gdev;
+
+	if (!chip)
+		return -EINVAL;
+
+	gdev = chip->gdev;
+
+	spin_lock(&hte_lock);
+	list_del(&gdev->list);
+	spin_unlock(&hte_lock);
+
+	gdev->chip = NULL;
+
+	of_node_put(chip->dev->of_node);
+	debugfs_remove_recursive(gdev->dbg_root);
+	kfree(gdev);
+
+	dev_dbg(chip->dev, "Removed hte chip\n");
+
+	return 0;
+}
+
+static void _hte_devm_unregister_chip(void *chip)
+{
+	hte_unregister_chip(chip);
+}
+
+/**
+ * devm_hte_register_chip() - Resource managed API to register HTE chip.
+ *
+ * It is used by the provider to register itself with the HTE subsystem.
+ * The unregistration is done automatically when the provider exits.
+ *
+ * @chip: the HTE chip to add to subsystem.
+ *
+ * Returns: 0 on success or a negative error code on failure.
+ */
+int devm_hte_register_chip(struct hte_chip *chip)
+{
+	int err;
+
+	err = hte_register_chip(chip);
+	if (err)
+		return err;
+
+	err = devm_add_action_or_reset(chip->dev, _hte_devm_unregister_chip,
+				       chip);
+	if (err)
+		return err;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(devm_hte_register_chip);
diff --git a/include/linux/hte.h b/include/linux/hte.h
new file mode 100644
index 000000000000..5bfccfe5d2ca
--- /dev/null
+++ b/include/linux/hte.h
@@ -0,0 +1,250 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __LINUX_HTE_H
+#define __LINUX_HTE_H
+
+#include <linux/errno.h>
+
+struct hte_chip;
+struct hte_device;
+struct of_phandle_args;
+
+/**
+ * enum hte_edge - HTE line edge flags.
+ *
+ * @HTE_EDGE_NO_SETUP: No edge setup. In this case consumer will setup edges,
+ * for example during request irq call.
+ * @HTE_RISING_EDGE_TS: Rising edge.
+ * @HTE_FALLING_EDGE_TS: Falling edge.
+ *
+ */
+enum hte_edge {
+	HTE_EDGE_NO_SETUP = 1U << 0,
+	HTE_RISING_EDGE_TS = 1U << 1,
+	HTE_FALLING_EDGE_TS = 1U << 2,
+};
+
+/**
+ * enum hte_return- HTE subsystem return values used during callback.
+ *
+ * @HTE_CB_HANDLED: The consumer handled the data.
+ * @HTE_RUN_THREADED_CB: The consumer needs further processing, in that case HTE
+ * subsystem will invoke kernel thread and call secondary callback provided by
+ * the consumer.
+ */
+enum hte_return {
+	HTE_CB_HANDLED,
+	HTE_RUN_THREADED_CB,
+};
+typedef enum hte_return hte_return_t;
+
+/**
+ * struct hte_ts_data - HTE timestamp data.
+ *
+ * @tsc: Timestamp value.
+ * @seq: Sequence counter of the timestamps.
+ * @raw_level: Level of the line at the timestamp if provider supports it,
+ * -1 otherwise.
+ */
+struct hte_ts_data {
+	u64 tsc;
+	u64 seq;
+	int raw_level;
+};
+
+/**
+ * struct hte_clk_info - Clock source info that HTE provider uses to timestamp.
+ *
+ * @hz: Supported clock rate in HZ, for example 1KHz clock = 1000.
+ * @type: Supported clock type.
+ */
+struct hte_clk_info {
+	u64 hz;
+	clockid_t type;
+};
+
+/**
+ * typedef hte_ts_cb_t - HTE timestamp data processing primary callback.
+ *
+ * The callback is used to push timestamp data to client.
+ *
+ * @ts: HW timestamp data.
+ * @data: Client supplied data.
+ */
+typedef hte_return_t (*hte_ts_cb_t)(struct hte_ts_data *ts, void *data);
+
+/**
+ * typedef hte_ts_threaded_cb_t - HTE timestamp data processing secondary
+ * threaded callback.
+ *
+ * @data: Client supplied data.
+ *
+ */
+typedef hte_return_t (*hte_ts_threaded_cb_t)(void *data);
+
+/**
+ * struct hte_line_attr - Line attributes.
+ *
+ * @line_id: The logical ID understood by the consumers and providers.
+ * @line_data: Line data related to line_id.
+ * @edge_flags: Edge setup flags.
+ * @name: Descriptive name of the entity that is being monitored for the
+ * hardware timestamping. If null, HTE core will construct the name.
+ * It is the consumer's job to free any allocation if name is set by the
+ * consumer. In case of HTE API parsing line_id from the device tree node
+ * name will be used as indexing if set.
+ *
+ */
+struct hte_line_attr {
+	u32 line_id;
+	void *line_data;
+	unsigned long edge_flags;
+	const char *name;
+};
+
+/**
+ * struct hte_ts_desc - HTE timestamp descriptor.
+ *
+ * This structure is a communication token between consumers to subsystem
+ * and subsystem to providers.
+ *
+ * @attr: The line attributes.
+ * @hte_data: Subsystem's private data, set by HTE subsystem.
+ */
+struct hte_ts_desc {
+	struct hte_line_attr attr;
+	void *hte_data;
+};
+
+/**
+ * struct hte_ops - HTE operations set by providers.
+ *
+ * @request: Hook for requesting a HTE timestamp. Returns 0 on success,
+ * non-zero for failures.
+ * @release: Hook for releasing a HTE timestamp. Returns 0 on success,
+ * non-zero for failures.
+ * @enable: Hook to enable the specified timestamp. Returns 0 on success,
+ * non-zero for failures.
+ * @disable: Hook to disable specified timestamp. Returns 0 on success,
+ * non-zero for failures.
+ * @get_clk_src_info: Hook to get the clock information the provider uses
+ * to timestamp. Returns 0 for success and negative error code for failure. On
+ * success HTE subsystem fills up provided struct hte_clk_info.
+ *
+ * xlated_id parameter is used to communicate between HTE subsystem and the
+ * providers and is translated by the provider.
+ */
+struct hte_ops {
+	int (*request)(struct hte_chip *chip, struct hte_ts_desc *desc,
+		       u32 xlated_id);
+	int (*release)(struct hte_chip *chip, struct hte_ts_desc *desc,
+		       u32 xlated_id);
+	int (*enable)(struct hte_chip *chip, u32 xlated_id);
+	int (*disable)(struct hte_chip *chip, u32 xlated_id);
+	int (*get_clk_src_info)(struct hte_chip *chip,
+				struct hte_clk_info *ci);
+};
+
+/**
+ * struct hte_chip - Abstract HTE chip.
+ *
+ * @name: functional name of the HTE IP block.
+ * @dev: device providing the HTE.
+ * @ops: callbacks for this HTE.
+ * @nlines: number of lines/signals supported by this chip.
+ * @xlate: Callback which translates consumer supplied logical ids to
+ * physical ids, return 0 for the success and negative for the failures.
+ * It stores (between 0 to @nlines) in xlated_id parameter for the success.
+ * @match_from_linedata: Match HTE device using the line_data.
+ * @of_hte_n_cells: Number of cells used to form the HTE specifier.
+ * @gdev: HTE subsystem abstract device, internal to the HTE subsystem.
+ * @data: chip specific private data.
+ */
+struct hte_chip {
+	const char *name;
+	struct device *dev;
+	const struct hte_ops *ops;
+	u32 nlines;
+	int (*xlate)(struct hte_chip *gc,
+		     const struct of_phandle_args *args,
+		     struct hte_ts_desc *desc, u32 *xlated_id);
+	bool (*match_from_linedata)(const struct hte_chip *chip,
+				    const struct hte_ts_desc *hdesc);
+	u8 of_hte_n_cells;
+
+	struct hte_device *gdev;
+	void *data;
+};
+
+#if IS_ENABLED(CONFIG_HTE)
+/* HTE APIs for the providers */
+int devm_hte_register_chip(struct hte_chip *chip);
+int hte_push_ts_ns(const struct hte_chip *chip, u32 xlated_id,
+		   struct hte_ts_data *data);
+
+/* HTE APIs for the consumers */
+
+int hte_release_ts(struct hte_ts_desc *desc);
+int devm_of_hte_request_ts_ns(struct device *dev, struct hte_ts_desc *desc,
+			      hte_ts_cb_t cb, hte_ts_threaded_cb_t tcb,
+			      void *data);
+int hte_req_ts_by_linedata_ns(struct hte_ts_desc *desc, hte_ts_cb_t cb,
+			      hte_ts_threaded_cb_t tcb, void *data);
+int hte_enable_ts(struct hte_ts_desc *desc);
+int hte_disable_ts(struct hte_ts_desc *desc);
+int hte_get_clk_src_info(const struct hte_ts_desc *desc,
+			 struct hte_clk_info *ci);
+
+#else /* !CONFIG_HTE */
+static inline int devm_hte_register_chip(struct hte_chip *chip)
+{
+	return -ENOTSUPP;
+}
+
+static inline int hte_push_ts_ns(const struct hte_chip *chip,
+				 u32 xlated_id,
+				 const struct hte_ts_data *data)
+{
+	return -ENOTSUPP;
+}
+
+static inline int hte_release_ts(struct hte_ts_desc *desc)
+{
+	return -ENOTSUPP;
+}
+
+static inline int devm_of_hte_request_ts_ns(struct device *dev,
+					    struct hte_ts_desc *desc,
+					    hte_ts_cb_t cb,
+					    hte_ts_threaded_cb_t tcb,
+					    void *data)
+{
+	return -ENOTSUPP;
+}
+
+static inline int hte_req_ts_by_linedata_ns(struct hte_ts_desc *desc,
+					    hte_ts_cb_t cb,
+					    hte_ts_threaded_cb_t tcb,
+					    void *data)
+{
+	return -ENOTSUPP;
+}
+
+static inline int hte_enable_ts(struct hte_ts_desc *desc)
+{
+	return -ENOTSUPP;
+}
+
+static inline int hte_disable_ts(struct hte_ts_desc *desc)
+{
+	return -ENOTSUPP;
+}
+
+static inline int hte_get_clk_src_info(const struct hte_ts_desc *desc,
+				       struct hte_clk_info *ci)
+{
+	return -ENOTSUPP;
+}
+#endif /* !CONFIG_HTE */
+
+#endif

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CC: Dipen Patel <dipenp@nvidia.com>
Subject: [RFC v4 03/11] hte: Add tegra194 HTE kernel provider
Date: Mon, 17 Jan 2022 16:22:06 -0800
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Tegra194 device has multiple HTE instances also known as GTE
(Generic hardware Timestamping Engine) which can timestamp subset of
SoC lines/signals. This provider driver focuses on IRQ and GPIO lines
and exposes timestamping ability on those lines to the consumers
through HTE subsystem.

Also, with this patch, added:
- documentation about this provider and its capabilities at
Documentation/hte.
- Compilation support in Makefile and Kconfig

Signed-off-by: Dipen Patel <dipenp@nvidia.com>
---
Changes in v3:
- Addressed grammatical/spelling errors.

Changes in v4:
- Added gpio line level detection.
- Added edge setup for GPIO lines if requested.
- Added match_from_linedata callback to help hte_req_ts_by_linedata_ns
HTE API.

 Documentation/hte/index.rst        |  22 +
 Documentation/hte/tegra194-hte.rst |  52 +++
 Documentation/index.rst            |   1 +
 drivers/hte/Kconfig                |  12 +
 drivers/hte/Makefile               |   1 +
 drivers/hte/hte-tegra194.c         | 690 +++++++++++++++++++++++++++++
 6 files changed, 778 insertions(+)
 create mode 100644 Documentation/hte/index.rst
 create mode 100644 Documentation/hte/tegra194-hte.rst
 create mode 100644 drivers/hte/hte-tegra194.c

diff --git a/Documentation/hte/index.rst b/Documentation/hte/index.rst
new file mode 100644
index 000000000000..9f43301c05dc
--- /dev/null
+++ b/Documentation/hte/index.rst
@@ -0,0 +1,22 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+============================================
+The Linux Hardware Timestamping Engine (HTE)
+============================================
+
+The HTE Subsystem
+=================
+
+.. toctree::
+   :maxdepth: 1
+
+   hte
+
+HTE Tegra Provider
+==================
+
+.. toctree::
+   :maxdepth: 1
+
+   tegra194-hte
+
diff --git a/Documentation/hte/tegra194-hte.rst b/Documentation/hte/tegra194-hte.rst
new file mode 100644
index 000000000000..5f8889accf00
--- /dev/null
+++ b/Documentation/hte/tegra194-hte.rst
@@ -0,0 +1,52 @@
+HTE Kernel provider driver
+==========================
+
+Description
+-----------
+The Nvidia tegra194 HTE provider driver implements two GTE
+(Generic Timestamping Engine) instances: 1) GPIO GTE and 2) LIC
+(Legacy Interrupt Controller) IRQ GTE. Both GTE instances get the
+timestamp from the system counter TSC which has 31.25MHz clock rate, and the
+driver converts clock tick rate to nanoseconds before storing it as timestamp
+value.
+
+GPIO GTE
+--------
+
+This GTE instance timestamps GPIO in real time. For that to happen GPIO
+needs to be configured as input. The always on (AON) GPIO controller instance
+supports timestamping GPIOs in real time and it has 39 GPIO lines. The GPIO GTE
+and AON GPIO controller are tightly coupled as it requires very specific bits
+to be set in GPIO config register before GPIO GTE can be used, for that GPIOLIB
+adds two optional APIs as below. The GPIO GTE code supports both kernel
+and userspace consumers. The kernel space consumers can directly talk to HTE
+subsytem while userspace consumers timestamp requests go through GPIOLIB CDEV
+framework to HTE subsystem.
+
+.. kernel-doc:: drivers/gpio/gpiolib.c
+   :functions: gpiod_enable_hw_timestamp gpiod_disable_hw_timestamp
+
+There is hte-tegra194-gpio-test.c, located in ``drivers/hte/`` directory, test
+driver which demonstrates GPIO GTE functionality in kenel space and code added
+in gpiolib-cdev.c demonstrates userspace example.
+
+For userspace consumers, GPIO_V2_LINE_FLAG_EVENT_CLOCK_HTE flag must be
+specified during IOCTL calls. Refer to ``tools/gpio/gpio-event-mon.c``, which
+returns the timestamp in nanoseconds.
+
+LIC (Legacy Interrupt Controller) IRQ GTE
+-----------------------------------------
+
+This GTE instance timestamps LIC IRQ lines in real time. There are 352 IRQ
+lines which this instance can add timestamps to in real time. The hte
+devicetree binding described at ``Documentation/devicetree/bindings/hte/``
+provides an example of how a consumer can request an IRQ line. Since it is a
+one-to-one mapping with IRQ GTE provider, consumers can simply specify the IRQ
+number that they are interested in. There is no userspace consumer support for
+this GTE instance in the hte framework. The sample test code
+hte-tegra194-irq-test.c, located in the ``drivers/hte/`` directory,
+demonstrates how to use an IRQ GTE instance.
+
+The provider source code of both IRQ and GPIO GTE instances is located at
+``drivers/hte/hte-tegra194.c``.
+
diff --git a/Documentation/index.rst b/Documentation/index.rst
index 2f99cedc95cd..2e42b439bf63 100644
--- a/Documentation/index.rst
+++ b/Documentation/index.rst
@@ -139,6 +139,7 @@ needed).
    scheduler/index
    mhi/index
    tty/index
+   hte/index
 
 Architecture-agnostic documentation
 -----------------------------------
diff --git a/drivers/hte/Kconfig b/drivers/hte/Kconfig
index 1fcfe17cf28a..ebd9817651c2 100644
--- a/drivers/hte/Kconfig
+++ b/drivers/hte/Kconfig
@@ -20,3 +20,15 @@ menuconfig HTE
 
 	  If unsure, say no.
 
+if HTE
+
+config HTE_TEGRA194
+	tristate "NVIDIA Tegra194 HTE Support"
+	depends on ARCH_TEGRA_194_SOC
+	help
+	  Enable this option for integrated hardware timestamping engine also
+	  known as generic timestamping engine (GTE) support on NVIDIA Tegra194
+	  systems-on-chip. The driver supports 352 LIC IRQs and 39 AON GPIOs
+	  lines for timestamping in realtime.
+
+endif
diff --git a/drivers/hte/Makefile b/drivers/hte/Makefile
index fc03bdf44427..3ae7c4029991 100644
--- a/drivers/hte/Makefile
+++ b/drivers/hte/Makefile
@@ -1,2 +1,3 @@
 obj-$(CONFIG_HTE)		+= hte.o
+obj-$(CONFIG_HTE_TEGRA194)	+= hte-tegra194.o
 
diff --git a/drivers/hte/hte-tegra194.c b/drivers/hte/hte-tegra194.c
new file mode 100644
index 000000000000..3c09f761ca0c
--- /dev/null
+++ b/drivers/hte/hte-tegra194.c
@@ -0,0 +1,690 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2021-2022 NVIDIA Corporation
+ *
+ * Author: Dipen Patel <dipenp@nvidia.com>
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/interrupt.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/hte.h>
+#include <linux/uaccess.h>
+#include <linux/gpio/driver.h>
+#include <linux/gpio/consumer.h>
+
+#define HTE_SUSPEND	0
+
+/* HTE source clock TSC is 31.25MHz */
+#define HTE_TS_CLK_RATE_HZ	31250000ULL
+#define HTE_CLK_RATE_NS		32
+#define HTE_TS_NS_SHIFT	__builtin_ctz(HTE_CLK_RATE_NS)
+
+#define NV_AON_SLICE_INVALID	-1
+#define NV_LINES_IN_SLICE	32
+
+/* AON HTE line map For slice 1 */
+#define NV_AON_HTE_SLICE1_IRQ_GPIO_28	12
+#define NV_AON_HTE_SLICE1_IRQ_GPIO_29	13
+
+/* AON HTE line map For slice 2 */
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_0	0
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_1	1
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_2	2
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_3	3
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_4	4
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_5	5
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_6	6
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_7	7
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_8	8
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_9	9
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_10	10
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_11	11
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_12	12
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_13	13
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_14	14
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_15	15
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_16	16
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_17	17
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_18	18
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_19	19
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_20	20
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_21	21
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_22	22
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_23	23
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_24	24
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_25	25
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_26	26
+#define NV_AON_HTE_SLICE2_IRQ_GPIO_27	27
+
+/* AON GPIO port AA pins */
+#define NV_AON_GPIO_PORT_AA_0		0
+#define NV_AON_GPIO_PORT_AA_1		1
+#define NV_AON_GPIO_PORT_AA_2		2
+#define NV_AON_GPIO_PORT_AA_3		3
+#define NV_AON_GPIO_PORT_AA_4		4
+#define NV_AON_GPIO_PORT_AA_5		5
+#define NV_AON_GPIO_PORT_AA_6		6
+#define NV_AON_GPIO_PORT_AA_7		7
+
+/* AON GPIO port BB pins */
+#define NV_AON_GPIO_PORT_BB_0		8
+#define NV_AON_GPIO_PORT_BB_1		9
+#define NV_AON_GPIO_PORT_BB_2		10
+#define NV_AON_GPIO_PORT_BB_3		11
+
+/* AON GPIO port CC pins */
+#define NV_AON_GPIO_PORT_CC_0		12
+#define NV_AON_GPIO_PORT_CC_1		13
+#define NV_AON_GPIO_PORT_CC_2		14
+#define NV_AON_GPIO_PORT_CC_3		15
+#define NV_AON_GPIO_PORT_CC_4		16
+#define NV_AON_GPIO_PORT_CC_5		17
+#define NV_AON_GPIO_PORT_CC_6		18
+#define NV_AON_GPIO_PORT_CC_7		19
+
+/* AON GPIO port DD pins */
+#define NV_AON_GPIO_PORT_DD_0		20
+#define NV_AON_GPIO_PORT_DD_1		21
+#define NV_AON_GPIO_PORT_DD_2		22
+
+/* AON GPIO port EE pins */
+#define NV_AON_GPIO_PORT_EE_0		23
+#define NV_AON_GPIO_PORT_EE_1		24
+#define NV_AON_GPIO_PORT_EE_2		25
+#define NV_AON_GPIO_PORT_EE_3		26
+#define NV_AON_GPIO_PORT_EE_4		27
+#define NV_AON_GPIO_PORT_EE_5		28
+#define NV_AON_GPIO_PORT_EE_6		29
+
+
+#define HTE_TECTRL		0x0
+#define HTE_TETSCH		0x4
+#define HTE_TETSCL		0x8
+#define HTE_TESRC		0xC
+#define HTE_TECCV		0x10
+#define HTE_TEPCV		0x14
+#define HTE_TECMD		0x1C
+#define HTE_TESTATUS		0x20
+#define HTE_SLICE0_TETEN	0x40
+#define HTE_SLICE1_TETEN	0x60
+
+#define HTE_SLICE_SIZE		(HTE_SLICE1_TETEN - HTE_SLICE0_TETEN)
+
+#define HTE_TECTRL_ENABLE_ENABLE	0x1
+
+#define HTE_TECTRL_OCCU_SHIFT		0x8
+#define HTE_TECTRL_INTR_SHIFT		0x1
+#define HTE_TECTRL_INTR_ENABLE		0x1
+
+#define HTE_TESRC_SLICE_SHIFT		16
+#define HTE_TESRC_SLICE_DEFAULT_MASK	0xFF
+
+#define HTE_TECMD_CMD_POP		0x1
+
+#define HTE_TESTATUS_OCCUPANCY_SHIFT	8
+#define HTE_TESTATUS_OCCUPANCY_MASK	0xFF
+
+enum tegra_hte_type {
+	HTE_TEGRA_TYPE_GPIO = 1U << 0,
+	HTE_TEGRA_TYPE_LIC = 1U << 1,
+};
+
+struct hte_slices {
+	u32 r_val;
+	unsigned long flags;
+	/* to prevent lines mapped to same slice updating its register */
+	spinlock_t s_lock;
+};
+
+struct tegra_hte_line_mapped {
+	int slice;
+	u32 bit_index;
+};
+
+struct tegra_hte_line_data {
+	unsigned long flags;
+	void *data;
+};
+
+struct tegra_hte_data {
+	enum tegra_hte_type type;
+	u32 map_sz;
+	const struct tegra_hte_line_mapped *map;
+};
+
+struct tegra_hte_soc {
+	int hte_irq;
+	u32 itr_thrshld;
+	u32 conf_rval;
+	struct hte_slices *sl;
+	const struct tegra_hte_data *prov_data;
+	struct tegra_hte_line_data *line_data;
+	struct hte_chip *chip;
+	struct gpio_chip *c;
+	void __iomem *regs;
+};
+
+static const struct tegra_hte_line_mapped tegra194_aon_gpio_map[] = {
+	/* gpio, slice, bit_index */
+	[NV_AON_GPIO_PORT_AA_0]  = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_11},
+	[NV_AON_GPIO_PORT_AA_1]  = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_10},
+	[NV_AON_GPIO_PORT_AA_2]  = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_9},
+	[NV_AON_GPIO_PORT_AA_3]  = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_8},
+	[NV_AON_GPIO_PORT_AA_4]  = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_7},
+	[NV_AON_GPIO_PORT_AA_5]  = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_6},
+	[NV_AON_GPIO_PORT_AA_6]  = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_5},
+	[NV_AON_GPIO_PORT_AA_7]  = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_4},
+	[NV_AON_GPIO_PORT_BB_0]  = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_3},
+	[NV_AON_GPIO_PORT_BB_1]  = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_2},
+	[NV_AON_GPIO_PORT_BB_2] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_1},
+	[NV_AON_GPIO_PORT_BB_3] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_0},
+	[NV_AON_GPIO_PORT_CC_0] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_22},
+	[NV_AON_GPIO_PORT_CC_1] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_21},
+	[NV_AON_GPIO_PORT_CC_2] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_20},
+	[NV_AON_GPIO_PORT_CC_3] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_19},
+	[NV_AON_GPIO_PORT_CC_4] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_18},
+	[NV_AON_GPIO_PORT_CC_5] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_17},
+	[NV_AON_GPIO_PORT_CC_6] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_16},
+	[NV_AON_GPIO_PORT_CC_7] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_15},
+	[NV_AON_GPIO_PORT_DD_0] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_14},
+	[NV_AON_GPIO_PORT_DD_1] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_13},
+	[NV_AON_GPIO_PORT_DD_2] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_12},
+	[NV_AON_GPIO_PORT_EE_0] = {1, NV_AON_HTE_SLICE1_IRQ_GPIO_29},
+	[NV_AON_GPIO_PORT_EE_1] = {1, NV_AON_HTE_SLICE1_IRQ_GPIO_28},
+	[NV_AON_GPIO_PORT_EE_2] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_27},
+	[NV_AON_GPIO_PORT_EE_3] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_26},
+	[NV_AON_GPIO_PORT_EE_4] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_25},
+	[NV_AON_GPIO_PORT_EE_5] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_24},
+	[NV_AON_GPIO_PORT_EE_6] = {2, NV_AON_HTE_SLICE2_IRQ_GPIO_23},
+};
+
+static const struct tegra_hte_data aon_hte = {
+	.map_sz = ARRAY_SIZE(tegra194_aon_gpio_map),
+	.map = tegra194_aon_gpio_map,
+	.type = HTE_TEGRA_TYPE_GPIO,
+};
+
+static const struct tegra_hte_data lic_hte = {
+	.map_sz = 0,
+	.map = NULL,
+	.type = HTE_TEGRA_TYPE_LIC,
+};
+
+static inline u32 tegra_hte_readl(struct tegra_hte_soc *hte, u32 reg)
+{
+	return readl(hte->regs + reg);
+}
+
+static inline void tegra_hte_writel(struct tegra_hte_soc *hte, u32 reg,
+				    u32 val)
+{
+	writel(val, hte->regs + reg);
+}
+
+static inline int tegra_hte_map_to_line_id(u32 eid, struct tegra_hte_soc *gs,
+					  u32 *mapped)
+{
+	const struct tegra_hte_line_mapped *m;
+
+	if (gs->prov_data && gs->prov_data->map) {
+		m = gs->prov_data->map;
+		if (eid > gs->prov_data->map_sz)
+			return -EINVAL;
+		if (m[eid].slice == NV_AON_SLICE_INVALID)
+			return -EINVAL;
+
+		*mapped = (m[eid].slice << 5) + m[eid].bit_index;
+	} else {
+		*mapped = eid;
+	}
+
+	return 0;
+}
+
+static int tegra_hte_line_xlate(struct hte_chip *gc,
+				const struct of_phandle_args *args,
+				struct hte_ts_desc *desc, u32 *xlated_id)
+{
+	int ret = 0;
+	u32 line_id;
+	struct tegra_hte_soc *gs;
+
+	if (!gc || !desc || !xlated_id)
+		return -EINVAL;
+
+	if (args) {
+		if (gc->of_hte_n_cells < 1)
+			return -EINVAL;
+
+		if (args->args_count != gc->of_hte_n_cells)
+			return -EINVAL;
+
+		desc->attr.line_id = args->args[0];
+	}
+
+	gs = gc->data;
+	if (!gs)
+		return -EINVAL;
+
+	/*
+	 * GPIO consumers send base + offset as line id which is a GPIO
+	 * logical id in GPIO namespace, convert it into the hardware GPIO
+	 * number before mapping it into HTE/GTE namespace.
+	 */
+	if (gs->prov_data->type == HTE_TEGRA_TYPE_GPIO)
+		line_id = desc->attr.line_id - gs->c->base;
+	else
+		line_id = desc->attr.line_id;
+
+	ret = tegra_hte_map_to_line_id(line_id, gc->data,
+				       xlated_id);
+	if (ret < 0) {
+		dev_dbg(gc->dev, "line_id:%u mapping failed\n",
+			desc->attr.line_id);
+		return ret;
+	}
+
+	if (*xlated_id > gc->nlines)
+		return -EINVAL;
+
+	dev_dbg(gc->dev, "requested id:%u, xlated id:%u\n",
+		desc->attr.line_id, *xlated_id);
+
+	return 0;
+}
+
+static int tegra_hte_en_dis_common(struct hte_chip *chip, u32 line_id, bool en)
+{
+	u32 slice, sl_bit_shift, line_bit, val, reg;
+	struct tegra_hte_soc *gs;
+
+	sl_bit_shift = __builtin_ctz(HTE_SLICE_SIZE);
+
+	if (!chip)
+		return -EINVAL;
+
+	gs = chip->data;
+
+	if (line_id > chip->nlines) {
+		dev_err(chip->dev,
+			"line id: %u is not supported by this controller\n",
+			line_id);
+		return -EINVAL;
+	}
+
+	slice = line_id >> sl_bit_shift;
+	line_bit = line_id & (HTE_SLICE_SIZE - 1);
+	reg = (slice << sl_bit_shift) + HTE_SLICE0_TETEN;
+
+	spin_lock(&gs->sl[slice].s_lock);
+
+	if (test_bit(HTE_SUSPEND, &gs->sl[slice].flags)) {
+		spin_unlock(&gs->sl[slice].s_lock);
+		dev_dbg(chip->dev, "device suspended");
+		return -EBUSY;
+	}
+
+	val = tegra_hte_readl(gs, reg);
+	if (en)
+		val = val | (1 << line_bit);
+	else
+		val = val & (~(1 << line_bit));
+	tegra_hte_writel(gs, reg, val);
+
+	spin_unlock(&gs->sl[slice].s_lock);
+
+	dev_dbg(chip->dev, "line: %u, slice %u, line_bit %u, reg:0x%x\n",
+		line_id, slice, line_bit, reg);
+
+	return 0;
+}
+
+static int tegra_hte_enable(struct hte_chip *chip, u32 line_id)
+{
+	if (!chip)
+		return -EINVAL;
+
+	return tegra_hte_en_dis_common(chip, line_id, true);
+}
+
+static int tegra_hte_disable(struct hte_chip *chip, u32 line_id)
+{
+	if (!chip)
+		return -EINVAL;
+
+	return tegra_hte_en_dis_common(chip, line_id, false);
+}
+
+static int tegra_hte_request(struct hte_chip *chip, struct hte_ts_desc *desc,
+			     u32 line_id)
+{
+	int ret;
+	struct tegra_hte_soc *gs;
+	struct hte_line_attr *attr;
+
+	if (!chip || !chip->data || !desc)
+		return -EINVAL;
+
+	gs = chip->data;
+	attr = &desc->attr;
+
+	if (gs->prov_data->type == HTE_TEGRA_TYPE_GPIO) {
+		ret = gpiod_enable_hw_timestamp(attr->line_data,
+						attr->edge_flags);
+		if (ret)
+			return ret;
+
+		gs->line_data[line_id].data = attr->line_data;
+		gs->line_data[line_id].flags = attr->edge_flags;
+	}
+
+	return tegra_hte_en_dis_common(chip, line_id, true);
+}
+
+static int tegra_hte_release(struct hte_chip *chip, struct hte_ts_desc *desc,
+			     u32 line_id)
+{
+	struct tegra_hte_soc *gs;
+	struct hte_line_attr *attr;
+	int ret;
+
+	if (!chip || !chip->data || !desc)
+		return -EINVAL;
+
+	gs = chip->data;
+	attr = &desc->attr;
+
+	if (gs->prov_data->type == HTE_TEGRA_TYPE_GPIO) {
+		ret = gpiod_disable_hw_timestamp(attr->line_data,
+						 gs->line_data[line_id].flags);
+		if (ret)
+			return ret;
+
+		gs->line_data[line_id].data = NULL;
+		gs->line_data[line_id].flags = 0;
+	}
+
+	return tegra_hte_en_dis_common(chip, line_id, false);
+}
+
+static int tegra_hte_clk_src_info(struct hte_chip *chip,
+				  struct hte_clk_info *ci)
+{
+	(void)chip;
+
+	if (!ci)
+		return -EINVAL;
+
+	ci->hz = HTE_TS_CLK_RATE_HZ;
+	ci->type = CLOCK_MONOTONIC;
+
+	return 0;
+}
+
+int tegra_hte_get_level(struct tegra_hte_soc *gs, u32 line_id)
+{
+	struct gpio_desc *desc;
+
+	if (gs->prov_data->type == HTE_TEGRA_TYPE_GPIO) {
+		desc = gs->line_data[line_id].data;
+		if (desc)
+			return gpiod_get_raw_value(desc);
+	}
+
+	return -1;
+}
+
+static void tegra_hte_read_fifo(struct tegra_hte_soc *gs)
+{
+	u32 tsh, tsl, src, pv, cv, acv, slice, bit_index, line_id;
+	u64 tsc;
+	struct hte_ts_data el;
+
+	while ((tegra_hte_readl(gs, HTE_TESTATUS) >>
+		HTE_TESTATUS_OCCUPANCY_SHIFT) &
+		HTE_TESTATUS_OCCUPANCY_MASK) {
+		tsh = tegra_hte_readl(gs, HTE_TETSCH);
+		tsl = tegra_hte_readl(gs, HTE_TETSCL);
+		tsc = (((u64)tsh << 32) | tsl);
+
+		src = tegra_hte_readl(gs, HTE_TESRC);
+		slice = (src >> HTE_TESRC_SLICE_SHIFT) &
+			    HTE_TESRC_SLICE_DEFAULT_MASK;
+
+		pv = tegra_hte_readl(gs, HTE_TEPCV);
+		cv = tegra_hte_readl(gs, HTE_TECCV);
+		acv = pv ^ cv;
+		while (acv) {
+			bit_index = __builtin_ctz(acv);
+			line_id = bit_index + (slice << 5);
+			el.tsc = tsc << HTE_TS_NS_SHIFT;
+			el.raw_level = tegra_hte_get_level(gs, line_id);
+			hte_push_ts_ns(gs->chip, line_id, &el);
+			acv &= ~BIT(bit_index);
+		}
+		tegra_hte_writel(gs, HTE_TECMD, HTE_TECMD_CMD_POP);
+	}
+}
+
+static irqreturn_t tegra_hte_isr(int irq, void *dev_id)
+{
+	struct tegra_hte_soc *gs = dev_id;
+	(void)irq;
+
+	tegra_hte_read_fifo(gs);
+
+	return IRQ_HANDLED;
+}
+
+bool tegra_hte_match_from_linedata(const struct hte_chip *chip,
+				   const struct hte_ts_desc *hdesc)
+{
+	struct tegra_hte_soc *hte_dev = chip->data;
+
+	if (!hte_dev || (hte_dev->prov_data->type != HTE_TEGRA_TYPE_GPIO))
+		return false;
+
+	return hte_dev->c == gpiod_to_chip(hdesc->attr.line_data);
+}
+
+static const struct of_device_id tegra_hte_of_match[] = {
+	{ .compatible = "nvidia,tegra194-gte-lic", .data = &lic_hte},
+	{ .compatible = "nvidia,tegra194-gte-aon", .data = &aon_hte},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, tegra_hte_of_match);
+
+static const struct hte_ops g_ops = {
+	.request = tegra_hte_request,
+	.release = tegra_hte_release,
+	.enable = tegra_hte_enable,
+	.disable = tegra_hte_disable,
+	.get_clk_src_info = tegra_hte_clk_src_info,
+};
+
+static void tegra_gte_disable(void *data)
+{
+	struct platform_device *pdev = data;
+	struct tegra_hte_soc *gs = dev_get_drvdata(&pdev->dev);
+
+	tegra_hte_writel(gs, HTE_TECTRL, 0);
+}
+
+static int tegra_get_gpiochip_from_name(struct gpio_chip *chip, void *data)
+{
+	return !strcmp(chip->label, data);
+}
+
+static int tegra_hte_probe(struct platform_device *pdev)
+{
+	int ret;
+	u32 i, slices, val = 0;
+	u32 nlines;
+	struct device *dev;
+	struct tegra_hte_soc *hte_dev;
+	struct hte_chip *gc;
+
+	dev = &pdev->dev;
+
+	ret = of_property_read_u32(dev->of_node, "nvidia,slices", &slices);
+	if (ret != 0) {
+		dev_err(dev, "Could not read slices\n");
+		return -EINVAL;
+	}
+	nlines = slices << 5;
+
+	hte_dev = devm_kzalloc(dev, sizeof(*hte_dev), GFP_KERNEL);
+	if (!hte_dev)
+		return -ENOMEM;
+
+	gc = devm_kzalloc(dev, sizeof(*gc), GFP_KERNEL);
+	if (!gc)
+		return -ENOMEM;
+
+	dev_set_drvdata(&pdev->dev, hte_dev);
+	hte_dev->prov_data = of_device_get_match_data(&pdev->dev);
+
+	hte_dev->regs = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(hte_dev->regs))
+		return PTR_ERR(hte_dev->regs);
+
+	ret = of_property_read_u32(dev->of_node, "nvidia,int-threshold",
+				   &hte_dev->itr_thrshld);
+	if (ret != 0)
+		hte_dev->itr_thrshld = 1;
+
+	hte_dev->sl = devm_kcalloc(dev, slices, sizeof(*hte_dev->sl),
+				   GFP_KERNEL);
+	if (!hte_dev->sl)
+		return -ENOMEM;
+
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0) {
+		dev_err_probe(dev, ret, "failed to get irq\n");
+		return ret;
+	}
+	hte_dev->hte_irq = ret;
+	ret = devm_request_irq(dev, hte_dev->hte_irq, tegra_hte_isr, 0,
+			       dev_name(dev), hte_dev);
+	if (ret < 0) {
+		dev_err(dev, "request irq failed.\n");
+		return ret;
+	}
+
+	gc->nlines = nlines;
+	gc->ops = &g_ops;
+	gc->dev = dev;
+	gc->data = hte_dev;
+	gc->xlate = tegra_hte_line_xlate;
+	gc->of_hte_n_cells = 1;
+
+	if (hte_dev->prov_data &&
+	    hte_dev->prov_data->type == HTE_TEGRA_TYPE_GPIO) {
+		hte_dev->line_data = devm_kcalloc(dev, nlines,
+						  sizeof(*hte_dev->line_data),
+						  GFP_KERNEL);
+		if (!hte_dev->line_data)
+			return -ENOMEM;
+
+		gc->match_from_linedata = tegra_hte_match_from_linedata;
+
+		hte_dev->c = gpiochip_find("tegra194-gpio-aon",
+					   tegra_get_gpiochip_from_name);
+		if (!hte_dev->c)
+			return dev_err_probe(dev, -EPROBE_DEFER,
+					     "wait for gpio controller\n");
+	}
+
+	hte_dev->chip = gc;
+
+	ret = devm_hte_register_chip(hte_dev->chip);
+	if (ret) {
+		dev_err(gc->dev, "hte chip register failed");
+		return ret;
+	}
+
+	for (i = 0; i < slices; i++) {
+		hte_dev->sl[i].flags = 0;
+		spin_lock_init(&hte_dev->sl[i].s_lock);
+	}
+
+	val = HTE_TECTRL_ENABLE_ENABLE |
+	      (HTE_TECTRL_INTR_ENABLE << HTE_TECTRL_INTR_SHIFT) |
+	      (hte_dev->itr_thrshld << HTE_TECTRL_OCCU_SHIFT);
+	tegra_hte_writel(hte_dev, HTE_TECTRL, val);
+
+	ret = devm_add_action_or_reset(&pdev->dev, tegra_gte_disable, pdev);
+	if (ret)
+		return ret;
+
+	dev_dbg(gc->dev, "lines: %d, slices:%d", gc->nlines, slices);
+
+	return 0;
+}
+
+static int __maybe_unused tegra_hte_resume_early(struct device *dev)
+{
+	u32 i;
+	struct tegra_hte_soc *gs = dev_get_drvdata(dev);
+	u32 slices = gs->chip->nlines / NV_LINES_IN_SLICE;
+	u32 sl_bit_shift = __builtin_ctz(HTE_SLICE_SIZE);
+
+	tegra_hte_writel(gs, HTE_TECTRL, gs->conf_rval);
+
+	for (i = 0; i < slices; i++) {
+		spin_lock(&gs->sl[i].s_lock);
+		tegra_hte_writel(gs,
+				 ((i << sl_bit_shift) + HTE_SLICE0_TETEN),
+				 gs->sl[i].r_val);
+		clear_bit(HTE_SUSPEND, &gs->sl[i].flags);
+		spin_unlock(&gs->sl[i].s_lock);
+	}
+
+	return 0;
+}
+
+static int __maybe_unused tegra_hte_suspend_late(struct device *dev)
+{
+	u32 i;
+	struct tegra_hte_soc *gs = dev_get_drvdata(dev);
+	u32 slices = gs->chip->nlines / NV_LINES_IN_SLICE;
+	u32 sl_bit_shift = __builtin_ctz(HTE_SLICE_SIZE);
+
+	gs->conf_rval = tegra_hte_readl(gs, HTE_TECTRL);
+	for (i = 0; i < slices; i++) {
+		spin_lock(&gs->sl[i].s_lock);
+		gs->sl[i].r_val = tegra_hte_readl(gs,
+				((i << sl_bit_shift) + HTE_SLICE0_TETEN));
+		set_bit(HTE_SUSPEND, &gs->sl[i].flags);
+		spin_unlock(&gs->sl[i].s_lock);
+	}
+
+	return 0;
+}
+
+static const struct dev_pm_ops tegra_hte_pm = {
+	SET_LATE_SYSTEM_SLEEP_PM_OPS(tegra_hte_suspend_late,
+				     tegra_hte_resume_early)
+};
+
+static struct platform_driver tegra_hte_driver = {
+	.probe = tegra_hte_probe,
+	.driver = {
+		.name = "tegra_hte",
+		.pm = &tegra_hte_pm,
+		.of_match_table = tegra_hte_of_match,
+	},
+};
+
+module_platform_driver(tegra_hte_driver);
+
+MODULE_AUTHOR("Dipen Patel <dipenp@nvidia.com>");
+MODULE_DESCRIPTION("NVIDIA Tegra HTE (Hardware Timestamping Engine) driver");
+MODULE_LICENSE("GPL v2");

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CC: Dipen Patel <dipenp@nvidia.com>
Subject: [RFC v4 04/11] dt-bindings: Add HTE bindings
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Introduces HTE devicetree binding details for the HTE subsystem. It
includes examples for the consumers, binding details for the providers
and specific binding details for the Tegra194 based HTE providers.

Signed-off-by: Dipen Patel <dipenp@nvidia.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
---
Changes in v2:
- Replace hte with hardware-timestamp for property names
- Renamed file
- Removed example from the common dt binding file.

Changes in v3:
- Addressed grammatical errors.
- Removed double plural from the respective properties.
- Added dual license.
- Prefixed "nvidia" in nvidia specific properties.

Changes in v4:
- Corrected make dt_binding_check error.

 .../hte/hardware-timestamps-common.yaml       | 29 +++++++
 .../devicetree/bindings/hte/hte-consumer.yaml | 44 ++++++++++
 .../bindings/hte/nvidia,tegra194-hte.yaml     | 82 +++++++++++++++++++
 3 files changed, 155 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hte/hardware-timestamps-common.yaml
 create mode 100644 Documentation/devicetree/bindings/hte/hte-consumer.yaml
 create mode 100644 Documentation/devicetree/bindings/hte/nvidia,tegra194-hte.yaml

diff --git a/Documentation/devicetree/bindings/hte/hardware-timestamps-common.yaml b/Documentation/devicetree/bindings/hte/hardware-timestamps-common.yaml
new file mode 100644
index 000000000000..ee6f94890695
--- /dev/null
+++ b/Documentation/devicetree/bindings/hte/hardware-timestamps-common.yaml
@@ -0,0 +1,29 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hte/hardware-timestamps-common.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Hardware timestamp providers
+
+maintainers:
+  - Dipen Patel <dipenp@nvidia.com>
+
+description: |
+  Some devices/SoCs have hardware time stamping engines which can use hardware
+  means to timestamp entity in realtime. The entity could be anything from
+  GPIOs, IRQs, Bus and so on. The hardware timestamp engine (HTE) present
+  itself as a provider with the bindings described in this document.
+
+properties:
+  $nodename:
+    pattern: "^hardware-timestamp(@.*|-[0-9a-f])?$"
+
+  "#hardware-timestamp-cells":
+    description:
+      Number of cells in a HTE specifier.
+
+required:
+  - "#hardware-timestamp-cells"
+
+additionalProperties: true
diff --git a/Documentation/devicetree/bindings/hte/hte-consumer.yaml b/Documentation/devicetree/bindings/hte/hte-consumer.yaml
new file mode 100644
index 000000000000..bb1232b31455
--- /dev/null
+++ b/Documentation/devicetree/bindings/hte/hte-consumer.yaml
@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hte/hte-consumer.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: HTE Consumer Device Tree Bindings
+
+maintainers:
+  - Dipen Patel <dipenp@nvidia.com>
+
+description: |
+  HTE properties should be named "hardware-timestamps". The exact meaning of
+  each hardware-timestamps property must be documented in the device tree
+  binding for each device. An optional property "hardware-timestamp-names" may
+  contain a list of strings to label each of the HTE devices listed in the
+  "hardware-timestamps" property.
+
+properties:
+  hardware-timestamps:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description:
+      The list of HTE provider phandle. The provider must document the number
+      of cell that must be passed in this property along with phandle.
+
+  hardware-timestamp-names:
+    $ref: /schemas/types.yaml#/definitions/string-array
+    description:
+      An optional string property.
+
+required:
+  - hardware-timestamps
+
+dependencies:
+  hardware-timestamp-names: [ hardware-timestamps ]
+
+additionalProperties: true
+
+examples:
+  - |
+    hte_irq_consumer {
+              hardware-timestamps = <&tegra_hte_lic 0x19>;
+              hardware-timestamp-names = "hte-irq";
+    };
diff --git a/Documentation/devicetree/bindings/hte/nvidia,tegra194-hte.yaml b/Documentation/devicetree/bindings/hte/nvidia,tegra194-hte.yaml
new file mode 100644
index 000000000000..c7d2acdb862e
--- /dev/null
+++ b/Documentation/devicetree/bindings/hte/nvidia,tegra194-hte.yaml
@@ -0,0 +1,82 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hte/nvidia,tegra194-hte.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Tegra194 on chip generic hardware timestamping engine (HTE)
+
+maintainers:
+  - Dipen Patel <dipenp@nvidia.com>
+
+description: |
+  Tegra194 SoC has multiple generic hardware timestamping engines (GTE) which
+  can monitor subset of GPIO and on chip IRQ lines for the state change, upon
+  detection it will record timestamp (taken from system counter) in its
+  internal hardware FIFO. It has a bitmap array arranged in 32bit slices where
+  each bit represent signal/line to enable or disable for the hardware
+  timestamping.
+
+properties:
+  compatible:
+    enum:
+      - nvidia,tegra194-gte-aon
+      - nvidia,tegra194-gte-lic
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  nvidia,int-threshold:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      HTE device generates its interrupt based on this u32 FIFO threshold
+      value. The recommended value is 1.
+    minimum: 1
+    maximum: 256
+
+  nvidia,slices:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      HTE lines are arranged in 32 bit slice where each bit represents different
+      line/signal that it can enable/configure for the timestamp. It is u32
+      property and depends on the HTE instance in the chip. The value 3 is for
+      GPIO GTE and 11 for IRQ GTE.
+    enum: [3, 11]
+
+  '#hardware-timestamp-cells':
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - nvidia,slices
+  - "#hardware-timestamp-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    tegra_hte_aon: hardware-timestamp@c1e0000 {
+              compatible = "nvidia,tegra194-gte-aon";
+              reg = <0xc1e0000 0x10000>;
+              interrupts = <0 13 0x4>;
+              nvidia,int-threshold = <1>;
+              nvidia,slices = <3>;
+              #hardware-timestamp-cells = <1>;
+    };
+
+  - |
+    tegra_hte_lic: hardware-timestamp@3aa0000 {
+              compatible = "nvidia,tegra194-gte-lic";
+              reg = <0x3aa0000 0x10000>;
+              interrupts = <0 11 0x4>;
+              nvidia,int-threshold = <1>;
+              nvidia,slices = <11>;
+              #hardware-timestamp-cells = <1>;
+    };
+
+...

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From: Dipen Patel <dipenp@nvidia.com>
To: <smangipudi@nvidia.com>, <thierry.reding@gmail.com>,
        <jonathanh@nvidia.com>, <linux-kernel@vger.kernel.org>,
        <linux-tegra@vger.kernel.org>, <linux-gpio@vger.kernel.org>,
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CC: Dipen Patel <dipenp@nvidia.com>
Subject: [RFC v4 05/11] hte: Add Tegra194 IRQ HTE test driver
Date: Mon, 17 Jan 2022 16:22:08 -0800
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Tegra194 has IRQ HTE provider which can timestamp IRQ lines in realtime
, this test driver implements consumer side which tests such provider
through HTE subsystem. During its probe, it registers sysfs interface
to easily navigate from userspace as below.

All the files are at /sys/kernel/tegra_hte_irq_test/.

- en_dis - Write only, Value 1 enables HTE line, 0 disables it

This driver can be compiled as loadable module and is tested on Jetson
AGX platform using 0x19 IRQ line which belongs to i2c controller
3160000.i2c.

i2cdetect -y 1 from the userspace on this platform should be enough to
generate LIC I2C IRQ. The HTE should be able to generate
timestamps for each interrupts.

Signed-off-by: Dipen Patel <dipenp@nvidia.com>
---
 drivers/hte/Kconfig                 |   7 ++
 drivers/hte/Makefile                |   1 +
 drivers/hte/hte-tegra194-irq-test.c | 179 ++++++++++++++++++++++++++++
 3 files changed, 187 insertions(+)
 create mode 100644 drivers/hte/hte-tegra194-irq-test.c

diff --git a/drivers/hte/Kconfig b/drivers/hte/Kconfig
index ebd9817651c2..dee8b7a2b980 100644
--- a/drivers/hte/Kconfig
+++ b/drivers/hte/Kconfig
@@ -31,4 +31,11 @@ config HTE_TEGRA194
 	  systems-on-chip. The driver supports 352 LIC IRQs and 39 AON GPIOs
 	  lines for timestamping in realtime.
 
+config HTE_TEGRA194_IRQ_TEST
+        tristate "NVIDIA Tegra194 HTE LIC IRQ Test"
+        depends on HTE_TEGRA194
+        help
+	  The NVIDIA Tegra194 GTE IRQ test driver demonstrates HTE subsystem
+	  usage for the LIC IRQ hardware timestamp.
+
 endif
diff --git a/drivers/hte/Makefile b/drivers/hte/Makefile
index 3ae7c4029991..75b7932c2ffc 100644
--- a/drivers/hte/Makefile
+++ b/drivers/hte/Makefile
@@ -1,3 +1,4 @@
 obj-$(CONFIG_HTE)		+= hte.o
 obj-$(CONFIG_HTE_TEGRA194)	+= hte-tegra194.o
+obj-$(CONFIG_HTE_TEGRA194_IRQ_TEST) += hte-tegra194-irq-test.o
 
diff --git a/drivers/hte/hte-tegra194-irq-test.c b/drivers/hte/hte-tegra194-irq-test.c
new file mode 100644
index 000000000000..9202e4ac5659
--- /dev/null
+++ b/drivers/hte/hte-tegra194-irq-test.c
@@ -0,0 +1,179 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2021-2022 NVIDIA Corporation
+ *
+ * Author: Dipen Patel <dipenp@nvidia.com>
+ */
+
+#include <linux/version.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/interrupt.h>
+#include <linux/hte.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+
+/*
+ * Tegra194 On chip HTE (hardware timestamping engine) also known as GTE
+ * (generic timestamping engine) can monitor LIC (Legacy interrupt controller)
+ * IRQ lines for the event and timestamp accordingly in realtime. Follow
+ * technical reference manual for the IRQ numbers and descriptions.
+ *
+ * This sample HTE IRQ test driver demonstrating HTE API usage by enabling
+ * lic irq line in HTE to monitor and timestamp.
+ *
+ * Device tree snippet to activate this driver:
+ *	tegra_hte_irq_test {
+ *		compatible = "nvidia,tegra194-hte-irq-test";
+ *		hardware-timestamps = <&tegra_hte_lic 0x19>;
+ *		hardware-timestamp-names = "hte-lic";
+ *		status = "okay";
+ *	};
+ *
+ * How to run this test driver (It is tested on Jetson AGX Xavier platform):
+ *
+ * - From above device tree snippet, it uses 0x19 interrupt which is for
+ *   i2c controller 1.
+ * - Once loaded, echo 1 >/sys/kernel/tegra_hte_irq_test/en_dis, it makes HTE
+ *   request on above IRQ line.
+ * - Run i2cdetect -y 1 1>/dev/null, this command will generate i2c bus
+ *   transactions which creates timestamp data. The driver print timestamp data
+ *   on console as IRQ HW timestamp(1): <timestamp>.
+ * - Unloading the driver or echo 0 >/sys/kernel/tegra_hte_irq_test/en_dis
+ *   disables the HTE.
+ */
+
+static struct tegra_hte_test {
+	struct hte_ts_desc desc;
+	struct kobject *kobj;
+	struct device *pdev;
+} hte;
+
+static hte_return_t process_hw_ts(struct hte_ts_data *ts, void *p)
+{
+	(void)p;
+
+	if (!ts)
+		return HTE_CB_HANDLED;
+
+	dev_info(hte.pdev, "IRQ HW timestamp(%llu): %llu\n", ts->seq, ts->tsc);
+
+	return HTE_CB_HANDLED;
+}
+
+/*
+ * Sysfs attribute to request/release HTE IRQ line.
+ */
+static ssize_t store_en_dis(struct kobject *kobj,
+			    struct kobj_attribute *attr,
+			    const char *buf, size_t count)
+{
+	int ret = count;
+	unsigned long val = 0;
+	struct hte_clk_info ci;
+	(void)kobj;
+	(void)attr;
+
+	if (kstrtoul(buf, 10, &val) < 0) {
+		ret = -EINVAL;
+		goto error;
+	}
+
+	if (val == 1) {
+		ret = devm_of_hte_request_ts_ns(hte.pdev, &hte.desc,
+						process_hw_ts, NULL, NULL);
+		if (ret)
+			goto error;
+
+		hte_get_clk_src_info(&hte.desc, &ci);
+		dev_info(hte.pdev, "clk rate:%llu, clk type: %d\n",
+			 ci.hz, ci.type);
+	} else if (val == 0) {
+		ret = hte_release_ts(&hte.desc);
+		if (ret)
+			goto error;
+	}
+
+	ret = count;
+
+error:
+	return ret;
+}
+
+struct kobj_attribute en_dis_attr =
+		__ATTR(en_dis, 0220, NULL, store_en_dis);
+
+static struct attribute *attrs[] = {
+	&en_dis_attr.attr,
+	NULL,
+};
+
+static struct attribute_group tegra_hte_test_attr_group = {
+	.attrs = attrs,
+};
+
+static int tegra_hte_test_sysfs_create(void)
+{
+	int ret;
+
+	/* Creates /sys/kernel/tegra_hte_irq_test */
+	hte.kobj = kobject_create_and_add("tegra_hte_irq_test", kernel_kobj);
+	if (!hte.kobj)
+		return -ENOMEM;
+
+	ret = sysfs_create_group(hte.kobj, &tegra_hte_test_attr_group);
+	if (ret)
+		kobject_put(hte.kobj);
+
+	return ret;
+}
+
+static const struct of_device_id tegra_hte_irq_test_of_match[] = {
+	{ .compatible = "nvidia,tegra194-hte-irq-test"},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, tegra_hte_irq_test_of_match);
+
+static int tegra_hte_test_probe(struct platform_device *pdev)
+{
+	int ret;
+
+	dev_set_drvdata(&pdev->dev, &hte);
+	hte.pdev = &pdev->dev;
+
+	if (of_property_read_string(hte.pdev->of_node,
+	    "hardware-timestamp-names", &hte.desc.attr.name))
+		hte.desc.attr.name = NULL;
+
+	ret = tegra_hte_test_sysfs_create();
+	if (ret != 0) {
+		dev_err(hte.pdev, "sysfs creation failed\n");
+		return -ENXIO;
+	}
+
+	return 0;
+}
+
+static int tegra_hte_test_remove(struct platform_device *pdev)
+{
+	(void)pdev;
+
+	kobject_put(hte.kobj);
+
+	return 0;
+}
+
+static struct platform_driver tegra_hte_irq_test_driver = {
+	.probe = tegra_hte_test_probe,
+	.remove = tegra_hte_test_remove,
+	.driver = {
+		.name = "tegra_hte_irq_test",
+		.of_match_table = tegra_hte_irq_test_of_match,
+	},
+};
+module_platform_driver(tegra_hte_irq_test_driver);
+
+MODULE_AUTHOR("Dipen Patel <dipenp@nvidia.com>");
+MODULE_LICENSE("GPL v2");

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From: Dipen Patel <dipenp@nvidia.com>
To: <smangipudi@nvidia.com>, <thierry.reding@gmail.com>,
        <jonathanh@nvidia.com>, <linux-kernel@vger.kernel.org>,
        <linux-tegra@vger.kernel.org>, <linux-gpio@vger.kernel.org>,
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CC: Dipen Patel <dipenp@nvidia.com>
Subject: [RFC v4 06/11] gpiolib: Add HTE support
Date: Mon, 17 Jan 2022 16:22:09 -0800
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Some GPIO chip can provide hardware timestamp support on its GPIO lines
, in order to support that, additional API needs to be added which
can talk to both GPIO chip and HTE (hardware timestamping engine)
providers if there is any dependencies. This patch introduces optional
hooks to enable and disable hardware timestamping related features
in the GPIO controller chip.

Signed-off-by: Dipen Patel <dipenp@nvidia.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reported-by: kernel test robot <lkp@intel.com>
---
Changes in v2:
- removed get timestamp and is timestamp enabled APIs

Changes in v4:
- Removed gpiod_req_hw_timestamp_ns and gpiod_rel_hw_timestamp_ns APIs.
- Added callbacks for the GPIO driver to enable hardware timestamping
functionality if supported which takes gpio desc and flags as arguments.
- Added APIs are called from GPIO provider rather than gpiolib-cdev framework.

 drivers/gpio/gpiolib.c        | 58 +++++++++++++++++++++++++++++++++++
 drivers/gpio/gpiolib.h        |  1 +
 include/linux/gpio/consumer.h | 16 ++++++++--
 include/linux/gpio/driver.h   | 10 ++++++
 4 files changed, 83 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 3859911b61e9..e9ffee5f4bc9 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2424,6 +2424,64 @@ int gpiod_direction_output(struct gpio_desc *desc, int value)
 }
 EXPORT_SYMBOL_GPL(gpiod_direction_output);
 
+/**
+ * gpiod_enable_hw_timestamp - Enable hardware timestamp.
+ *
+ * @desc: GPIO to enable.
+ * @flags: Flags related to GPIO edge.
+ *
+ * Return 0 in case of success, else negative error code.
+ */
+int gpiod_enable_hw_timestamp(struct gpio_desc *desc, unsigned long flags)
+{
+	int ret = 0;
+	struct gpio_chip *gc;
+
+	VALIDATE_DESC(desc);
+
+	gc = desc->gdev->chip;
+	if (!gc->en_hw_timestamp) {
+		gpiod_warn(desc, "%s: hw ts not supported\n", __func__);
+		return -ENOTSUPP;
+	}
+
+	ret = gc->en_hw_timestamp(gc, gpio_chip_hwgpio(desc), flags);
+	if (ret)
+		gpiod_warn(desc, "%s: hw ts request failed\n", __func__);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(gpiod_enable_hw_timestamp);
+
+/**
+ * gpiod_disable_hw_timestamp - Disable hardware timestamp.
+ *
+ * @desc: GPIO to disable.
+ * @flags: Flags related to GPIO edge, same value as used during enable call.
+ *
+ * Return 0 in case of success, else negative error code.
+ */
+int gpiod_disable_hw_timestamp(struct gpio_desc *desc, unsigned long flags)
+{
+	int ret = 0;
+	struct gpio_chip *gc;
+
+	VALIDATE_DESC(desc);
+
+	gc = desc->gdev->chip;
+	if (!gc->dis_hw_timestamp) {
+		gpiod_warn(desc, "%s: hw ts not supported\n", __func__);
+		return -ENOTSUPP;
+	}
+
+	ret = gc->dis_hw_timestamp(gc, gpio_chip_hwgpio(desc), flags);
+	if (ret)
+		gpiod_warn(desc, "%s: hw ts release failed\n", __func__);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(gpiod_disable_hw_timestamp);
+
 /**
  * gpiod_set_config - sets @config for a GPIO
  * @desc: descriptor of the GPIO for which to set the configuration
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index 30bc3f80f83e..33acc5754630 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -117,6 +117,7 @@ struct gpio_desc {
 #define FLAG_EDGE_RISING     16	/* GPIO CDEV detects rising edge events */
 #define FLAG_EDGE_FALLING    17	/* GPIO CDEV detects falling edge events */
 #define FLAG_EVENT_CLOCK_REALTIME	18 /* GPIO CDEV reports REALTIME timestamps in events */
+#define FLAG_EVENT_CLOCK_HTE		19 /* GPIO CDEV reports hardware timestamps in events */
 
 	/* Connection label */
 	const char		*label;
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 3ad67b4a72be..e85e590e3ce8 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -112,6 +112,8 @@ int gpiod_get_direction(struct gpio_desc *desc);
 int gpiod_direction_input(struct gpio_desc *desc);
 int gpiod_direction_output(struct gpio_desc *desc, int value);
 int gpiod_direction_output_raw(struct gpio_desc *desc, int value);
+int gpiod_enable_hw_timestamp(struct gpio_desc *desc, unsigned long flags);
+int gpiod_disable_hw_timestamp(struct gpio_desc *desc, unsigned long flags);
 
 /* Value get/set from non-sleeping context */
 int gpiod_get_value(const struct gpio_desc *desc);
@@ -353,8 +355,18 @@ static inline int gpiod_direction_output_raw(struct gpio_desc *desc, int value)
 	WARN_ON(desc);
 	return -ENOSYS;
 }
-
-
+static inline int gpiod_enable_hw_timestamp_ns(struct gpio_desc *desc,
+					       unsigned long flags)
+{
+	WARN_ON(desc);
+	return -ENOSYS;
+}
+static inline int gpiod_disable_hw_timestamp_ns(struct gpio_desc *desc,
+						unsigned long flags)
+{
+	WARN_ON(desc);
+	return -ENOSYS;
+}
 static inline int gpiod_get_value(const struct gpio_desc *desc)
 {
 	/* GPIO can never have been requested */
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index b0728c8ad90c..f28d1e9b61f0 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -320,6 +320,10 @@ struct gpio_irq_chip {
  * @add_pin_ranges: optional routine to initialize pin ranges, to be used when
  *	requires special mapping of the pins that provides GPIO functionality.
  *	It is called after adding GPIO chip and before adding IRQ chip.
+ * @en_hw_timestamp: Dependent on GPIO chip, an optional routine to
+ *	enable hardware timestamp.
+ * @dis_hw_timestamp: Dependent on GPIO chip, an optional routine to
+ *	disable hardware timestamp.
  * @base: identifies the first GPIO number handled by this chip;
  *	or, if negative during registration, requests dynamic ID allocation.
  *	DEPRECATION: providing anything non-negative and nailing the base
@@ -416,6 +420,12 @@ struct gpio_chip {
 
 	int			(*add_pin_ranges)(struct gpio_chip *gc);
 
+	int			(*en_hw_timestamp)(struct gpio_chip *gc,
+						   u32 offset,
+						   unsigned long flags);
+	int			(*dis_hw_timestamp)(struct gpio_chip *gc,
+						    u32 offset,
+						    unsigned long flags);
 	int			base;
 	u16			ngpio;
 	u16			offset;

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From: Dipen Patel <dipenp@nvidia.com>
To: <smangipudi@nvidia.com>, <thierry.reding@gmail.com>,
        <jonathanh@nvidia.com>, <linux-kernel@vger.kernel.org>,
        <linux-tegra@vger.kernel.org>, <linux-gpio@vger.kernel.org>,
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CC: Dipen Patel <dipenp@nvidia.com>
Subject: [RFC v4 07/11] gpio: tegra186: Add HTE in gpio-tegra186 driver
Date: Mon, 17 Jan 2022 16:22:10 -0800
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Tegra194 AON GPIO controller with the use of its internal hardware
timestamping engine (HTE) also known as GTE can timestamp GPIO
lines through system counter. This patch implements enable/disable
callbacks for the GPIO controller. In enable call, it will set
timestamp function bit and GPIO line rising/falling edges in the
config register. In disable call, it restores the state.

Signed-off-by: Dipen Patel <dipenp@nvidia.com>
---
Changes in v4:
- Added edge setup and hardware timestamping enable/disable APIs.

 drivers/gpio/gpio-tegra186.c | 81 +++++++++++++++++++++++++++++++++++-
 1 file changed, 80 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-tegra186.c b/drivers/gpio/gpio-tegra186.c
index 91c77fccc1e6..3bf6f7e18dcc 100644
--- a/drivers/gpio/gpio-tegra186.c
+++ b/drivers/gpio/gpio-tegra186.c
@@ -1,8 +1,9 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (c) 2016-2017 NVIDIA Corporation
+ * Copyright (c) 2016-2022 NVIDIA Corporation
  *
  * Author: Thierry Reding <treding@nvidia.com>
+ *	   Dipen Patel <dpatel@nvidia.com>
  */
 
 #include <linux/gpio/driver.h>
@@ -11,6 +12,7 @@
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
+#include <linux/hte.h>
 
 #include <dt-bindings/gpio/tegra186-gpio.h>
 #include <dt-bindings/gpio/tegra194-gpio.h>
@@ -35,6 +37,7 @@
 #define  TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_LEVEL BIT(4)
 #define  TEGRA186_GPIO_ENABLE_CONFIG_DEBOUNCE BIT(5)
 #define  TEGRA186_GPIO_ENABLE_CONFIG_INTERRUPT BIT(6)
+#define  TEGRA186_GPIO_ENABLE_CONFIG_TIMESTAMP_FUNC BIT(7)
 
 #define TEGRA186_GPIO_DEBOUNCE_CONTROL 0x04
 #define  TEGRA186_GPIO_DEBOUNCE_CONTROL_THRESHOLD(x) ((x) & 0xff)
@@ -75,6 +78,7 @@ struct tegra_gpio_soc {
 	const struct tegra186_pin_range *pin_ranges;
 	unsigned int num_pin_ranges;
 	const char *pinmux;
+	bool has_gte;
 };
 
 struct tegra_gpio {
@@ -193,6 +197,76 @@ static int tegra186_gpio_direction_output(struct gpio_chip *chip,
 	return 0;
 }
 
+#define HTE_BOTH_EDGES	(HTE_RISING_EDGE_TS | HTE_FALLING_EDGE_TS)
+
+static int tegra186_gpio_en_hw_ts(struct gpio_chip *gc, u32 offset,
+				  unsigned long flags)
+{
+	struct tegra_gpio *gpio;
+	void __iomem *base;
+	int value;
+
+	if (!gc)
+		return -EINVAL;
+
+	gpio = gpiochip_get_data(gc);
+	if (!gpio)
+		return -ENODEV;
+
+	base = tegra186_gpio_get_base(gpio, offset);
+	if (WARN_ON(base == NULL))
+		return -EINVAL;
+
+	value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
+	value |= TEGRA186_GPIO_ENABLE_CONFIG_TIMESTAMP_FUNC;
+
+	if (flags == HTE_BOTH_EDGES) {
+		value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_DOUBLE_EDGE;
+	} else if (flags == HTE_RISING_EDGE_TS) {
+		value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_SINGLE_EDGE;
+		value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_LEVEL;
+	} else if (flags == HTE_FALLING_EDGE_TS) {
+		value |= TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_SINGLE_EDGE;
+	}
+
+	writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);
+
+	return 0;
+}
+
+static int tegra186_gpio_dis_hw_ts(struct gpio_chip *gc, u32 offset,
+				   unsigned long flags)
+{
+	struct tegra_gpio *gpio;
+	void __iomem *base;
+	int value;
+
+	if (!gc)
+		return -EINVAL;
+
+	gpio = gpiochip_get_data(gc);
+	if (!gpio)
+		return -ENODEV;
+
+	base = tegra186_gpio_get_base(gpio, offset);
+	if (WARN_ON(base == NULL))
+		return -EINVAL;
+
+	value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
+	value &= ~TEGRA186_GPIO_ENABLE_CONFIG_TIMESTAMP_FUNC;
+	if (flags == HTE_BOTH_EDGES) {
+		value &= ~TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_DOUBLE_EDGE;
+	} else if (flags == HTE_RISING_EDGE_TS) {
+		value &= ~TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_SINGLE_EDGE;
+		value &= ~TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_LEVEL;
+	} else if (flags == HTE_FALLING_EDGE_TS) {
+		value &= ~TEGRA186_GPIO_ENABLE_CONFIG_TRIGGER_TYPE_SINGLE_EDGE;
+	}
+	writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);
+
+	return 0;
+}
+
 static int tegra186_gpio_get(struct gpio_chip *chip, unsigned int offset)
 {
 	struct tegra_gpio *gpio = gpiochip_get_data(chip);
@@ -719,6 +793,10 @@ static int tegra186_gpio_probe(struct platform_device *pdev)
 	gpio->gpio.set = tegra186_gpio_set;
 	gpio->gpio.set_config = tegra186_gpio_set_config;
 	gpio->gpio.add_pin_ranges = tegra186_gpio_add_pin_ranges;
+	if (gpio->soc->has_gte) {
+		gpio->gpio.en_hw_timestamp = tegra186_gpio_en_hw_ts;
+		gpio->gpio.dis_hw_timestamp = tegra186_gpio_dis_hw_ts;
+	}
 
 	gpio->gpio.base = -1;
 
@@ -971,6 +1049,7 @@ static const struct tegra_gpio_soc tegra194_aon_soc = {
 	.name = "tegra194-gpio-aon",
 	.instance = 1,
 	.num_irqs_per_bank = 8,
+	.has_gte = true,
 };
 
 #define TEGRA234_MAIN_GPIO_PORT(_name, _bank, _port, _pins)	\

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CC: Dipen Patel <dipenp@nvidia.com>
Subject: [RFC v4 08/11] gpiolib: cdev: Add hardware timestamp clock type
Date: Mon, 17 Jan 2022 16:22:11 -0800
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This patch adds new clock type for the GPIO controller which can
timestamp gpio lines in using hardware means. To expose such
functionalities to the userspace, code has been added where
during line create or set config API calls, it checks for new
clock type and if requested, calls HTE API. During line change
event, the HTE subsystem pushes timestamp data to userspace
through gpiolib-cdev.

Signed-off-by: Dipen Patel <dipenp@nvidia.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
---
Changes in v2:
- Added hte_dir and static structure hte_ts_desc.
- Added callbacks which get invoked by HTE when new data is available.
- Better use of hte_dir and seq from hte_ts_desc.
- Modified sw debounce function to accommodate hardware timestamping.

Changes in v4:
- Correced line level and event sequence counter handling.
- Added hte edge setup functionality.

 drivers/gpio/gpiolib-cdev.c | 247 +++++++++++++++++++++++++++++++-----
 include/uapi/linux/gpio.h   |   3 +
 2 files changed, 217 insertions(+), 33 deletions(-)

diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index c7b5446d01fd..a4f2de229e6c 100644
--- a/drivers/gpio/gpiolib-cdev.c
+++ b/drivers/gpio/gpiolib-cdev.c
@@ -24,6 +24,7 @@
 #include <linux/timekeeping.h>
 #include <linux/uaccess.h>
 #include <linux/workqueue.h>
+#include <linux/hte.h>
 #include <uapi/linux/gpio.h>
 
 #include "gpiolib.h"
@@ -464,6 +465,25 @@ struct line {
 	 * stale value.
 	 */
 	unsigned int level;
+	/*
+	 * -- hte specific fields --
+	 */
+	struct hte_ts_desc hdesc;
+	/*
+	 * HTE provider sets line level at the time of event. The valid
+	 * value is 0 or 1 and negative value for an error.
+	 */
+	int raw_level;
+	/*
+	 * when sw_debounce is set on HTE enabled line, this is running
+	 * counter of the discarded events.
+	 */
+	u32 total_discard_seq;
+	/*
+	 * when sw_debounce is set on HTE enabled line, this variable records
+	 * last sequence number before debounce period expires.
+	 */
+	u32 last_seqno;
 };
 
 /**
@@ -518,6 +538,7 @@ struct linereq {
 	 GPIO_V2_LINE_DRIVE_FLAGS | \
 	 GPIO_V2_LINE_EDGE_FLAGS | \
 	 GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME | \
+	 GPIO_V2_LINE_FLAG_EVENT_CLOCK_HTE | \
 	 GPIO_V2_LINE_BIAS_FLAGS)
 
 static void linereq_put_event(struct linereq *lr,
@@ -542,10 +563,98 @@ static u64 line_event_timestamp(struct line *line)
 {
 	if (test_bit(FLAG_EVENT_CLOCK_REALTIME, &line->desc->flags))
 		return ktime_get_real_ns();
+	else if (test_bit(FLAG_EVENT_CLOCK_HTE, &line->desc->flags))
+		return line->timestamp_ns;
 
 	return ktime_get_ns();
 }
 
+static hte_return_t process_hw_ts_thread(void *p)
+{
+	struct line *line;
+	struct linereq *lr;
+	struct gpio_v2_line_event le;
+	int level;
+	u64 eflags;
+
+	if (!p)
+		return HTE_CB_HANDLED;
+
+	line = p;
+	lr = line->req;
+
+	memset(&le, 0, sizeof(le));
+
+	le.timestamp_ns = line->timestamp_ns;
+	eflags = READ_ONCE(line->eflags);
+
+	if (eflags == GPIO_V2_LINE_FLAG_EDGE_BOTH) {
+		if (line->raw_level >= 0) {
+			if (test_bit(FLAG_ACTIVE_LOW, &line->desc->flags))
+				level = !line->raw_level;
+			else
+				level = line->raw_level;
+		} else {
+			level = gpiod_get_value_cansleep(line->desc);
+		}
+
+		if (level)
+			le.id = GPIO_V2_LINE_EVENT_RISING_EDGE;
+		else
+			le.id = GPIO_V2_LINE_EVENT_FALLING_EDGE;
+	} else if (eflags == GPIO_V2_LINE_FLAG_EDGE_RISING) {
+		/* Emit low-to-high event */
+		le.id = GPIO_V2_LINE_EVENT_RISING_EDGE;
+	} else if (eflags == GPIO_V2_LINE_FLAG_EDGE_FALLING) {
+		/* Emit high-to-low event */
+		le.id = GPIO_V2_LINE_EVENT_FALLING_EDGE;
+	} else {
+		return HTE_CB_HANDLED;
+	}
+	le.line_seqno = line->line_seqno;
+	le.seqno = (lr->num_lines == 1) ? le.line_seqno : line->req_seqno;
+	le.offset = gpio_chip_hwgpio(line->desc);
+
+	linereq_put_event(lr, &le);
+
+	return HTE_CB_HANDLED;
+}
+
+static hte_return_t process_hw_ts(struct hte_ts_data *ts, void *p)
+{
+	struct line *line;
+	struct linereq *lr;
+	int diff_seqno = 0;
+
+	if (!ts || !p)
+		return HTE_CB_HANDLED;
+
+	line = p;
+	line->timestamp_ns = ts->tsc;
+	line->raw_level = ts->raw_level;
+	lr = line->req;
+
+	if (READ_ONCE(line->sw_debounced)) {
+		line->total_discard_seq++;
+		line->last_seqno = ts->seq;
+		mod_delayed_work(system_wq, &line->work,
+		  usecs_to_jiffies(READ_ONCE(line->desc->debounce_period_us)));
+	} else {
+		if (unlikely(ts->seq < line->line_seqno))
+			return HTE_CB_HANDLED;
+
+		diff_seqno = ts->seq - line->line_seqno;
+		line->line_seqno = ts->seq;
+		if (lr->num_lines != 1)
+			line->req_seqno = atomic_add_return(diff_seqno,
+							    &lr->seqno);
+
+		return HTE_RUN_THREADED_CB;
+	}
+
+	return HTE_CB_HANDLED;
+}
+
 static irqreturn_t edge_irq_thread(int irq, void *p)
 {
 	struct line *line = p;
@@ -651,10 +760,16 @@ static void debounce_work_func(struct work_struct *work)
 	struct gpio_v2_line_event le;
 	struct line *line = container_of(work, struct line, work.work);
 	struct linereq *lr;
-	int level;
+	int level, diff_seqno;
 	u64 eflags;
 
-	level = gpiod_get_raw_value_cansleep(line->desc);
+	if (test_bit(FLAG_EVENT_CLOCK_HTE, &line->desc->flags)) {
+		level = line->raw_level;
+		if (level < 0)
+			level = gpiod_get_raw_value_cansleep(line->desc);
+	} else {
+		level = gpiod_get_raw_value_cansleep(line->desc);
+	}
 	if (level < 0) {
 		pr_debug_ratelimited("debouncer failed to read line value\n");
 		return;
@@ -685,10 +800,21 @@ static void debounce_work_func(struct work_struct *work)
 	lr = line->req;
 	le.timestamp_ns = line_event_timestamp(line);
 	le.offset = gpio_chip_hwgpio(line->desc);
-	line->line_seqno++;
-	le.line_seqno = line->line_seqno;
-	le.seqno = (lr->num_lines == 1) ?
-		le.line_seqno : atomic_inc_return(&lr->seqno);
+	if (test_bit(FLAG_EVENT_CLOCK_HTE, &line->desc->flags)) {
+		/* discard events except the last one */
+		line->total_discard_seq -= 1;
+		diff_seqno = line->last_seqno - line->total_discard_seq -
+				line->line_seqno;
+		line->line_seqno = line->last_seqno - line->total_discard_seq;
+		le.line_seqno = line->line_seqno;
+		le.seqno = (lr->num_lines == 1) ?
+			le.line_seqno : atomic_add_return(diff_seqno, &lr->seqno);
+	} else {
+		line->line_seqno++;
+		le.line_seqno = line->line_seqno;
+		le.seqno = (lr->num_lines == 1) ?
+			le.line_seqno : atomic_inc_return(&lr->seqno);
+	}
 
 	if (level)
 		/* Emit low-to-high event */
@@ -700,8 +826,29 @@ static void debounce_work_func(struct work_struct *work)
 	linereq_put_event(lr, &le);
 }
 
+static int hte_edge_setup(struct line *line, u64 eflags)
+{
+	unsigned long flags;
+	struct hte_ts_desc *hdesc = &line->hdesc;
+
+	if (eflags & GPIO_V2_LINE_FLAG_EDGE_RISING)
+		flags |= test_bit(FLAG_ACTIVE_LOW, &line->desc->flags) ?
+				  HTE_FALLING_EDGE_TS : HTE_RISING_EDGE_TS;
+	if (eflags & GPIO_V2_LINE_FLAG_EDGE_FALLING)
+		flags |= test_bit(FLAG_ACTIVE_LOW, &line->desc->flags) ?
+				  HTE_RISING_EDGE_TS : HTE_FALLING_EDGE_TS;
+
+	hdesc->attr.edge_flags = flags;
+	hdesc->attr.line_data = line->desc;
+	hdesc->attr.line_id = desc_to_gpio(line->desc);
+	line->total_discard_seq = 0;
+
+	return hte_req_ts_by_linedata_ns(hdesc, process_hw_ts,
+					 process_hw_ts_thread, line);
+}
+
 static int debounce_setup(struct line *line,
-			  unsigned int debounce_period_us)
+			  unsigned int debounce_period_us, bool hte_req)
 {
 	unsigned long irqflags;
 	int ret, level, irq;
@@ -721,19 +868,27 @@ static int debounce_setup(struct line *line,
 		if (level < 0)
 			return level;
 
-		irq = gpiod_to_irq(line->desc);
-		if (irq < 0)
-			return -ENXIO;
+		if (!hte_req) {
+			irq = gpiod_to_irq(line->desc);
+			if (irq < 0)
+				return -ENXIO;
 
-		WRITE_ONCE(line->level, level);
-		irqflags = IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING;
-		ret = request_irq(irq, debounce_irq_handler, irqflags,
-				  line->req->label, line);
-		if (ret)
-			return ret;
+			irqflags = IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING;
+			ret = request_irq(irq, debounce_irq_handler, irqflags,
+					  line->req->label, line);
+			if (ret)
+				return ret;
+			line->irq = irq;
+		} else {
+			ret = hte_edge_setup(line,
+					     GPIO_V2_LINE_FLAG_EDGE_RISING |
+					     GPIO_V2_LINE_FLAG_EDGE_FALLING);
+			if (ret)
+				return ret;
+		}
 
+		WRITE_ONCE(line->level, level);
 		WRITE_ONCE(line->sw_debounced, 1);
-		line->irq = irq;
 	}
 	return 0;
 }
@@ -766,13 +921,16 @@ static u32 gpio_v2_line_config_debounce_period(struct gpio_v2_line_config *lc,
 	return 0;
 }
 
-static void edge_detector_stop(struct line *line)
+static void edge_detector_stop(struct line *line, bool hte_en)
 {
-	if (line->irq) {
+	if (line->irq && !hte_en) {
 		free_irq(line->irq, line);
 		line->irq = 0;
 	}
 
+	if (hte_en)
+		hte_release_ts(&line->hdesc);
+
 	cancel_delayed_work_sync(&line->work);
 	WRITE_ONCE(line->sw_debounced, 0);
 	WRITE_ONCE(line->eflags, 0);
@@ -784,7 +942,7 @@ static void edge_detector_stop(struct line *line)
 static int edge_detector_setup(struct line *line,
 			       struct gpio_v2_line_config *lc,
 			       unsigned int line_idx,
-			       u64 eflags)
+			       u64 eflags, bool hte_req)
 {
 	u32 debounce_period_us;
 	unsigned long irqflags = 0;
@@ -799,7 +957,7 @@ static int edge_detector_setup(struct line *line,
 	WRITE_ONCE(line->eflags, eflags);
 	if (gpio_v2_line_config_debounced(lc, line_idx)) {
 		debounce_period_us = gpio_v2_line_config_debounce_period(lc, line_idx);
-		ret = debounce_setup(line, debounce_period_us);
+		ret = debounce_setup(line, debounce_period_us, hte_req);
 		if (ret)
 			return ret;
 		WRITE_ONCE(line->desc->debounce_period_us, debounce_period_us);
@@ -809,6 +967,9 @@ static int edge_detector_setup(struct line *line,
 	if (!eflags || READ_ONCE(line->sw_debounced))
 		return 0;
 
+	if (hte_req)
+		return hte_edge_setup(line, eflags);
+
 	irq = gpiod_to_irq(line->desc);
 	if (irq < 0)
 		return -ENXIO;
@@ -834,13 +995,18 @@ static int edge_detector_setup(struct line *line,
 static int edge_detector_update(struct line *line,
 				struct gpio_v2_line_config *lc,
 				unsigned int line_idx,
-				u64 eflags, bool polarity_change)
+				u64 flags, bool polarity_change,
+				bool prev_hte_flag)
 {
+	u64 eflags = flags & GPIO_V2_LINE_EDGE_FLAGS;
 	unsigned int debounce_period_us =
-		gpio_v2_line_config_debounce_period(lc, line_idx);
+			gpio_v2_line_config_debounce_period(lc, line_idx);
+	bool hte_change = (prev_hte_flag !=
+		      ((flags & GPIO_V2_LINE_FLAG_EVENT_CLOCK_HTE) != 0));
 
 	if ((READ_ONCE(line->eflags) == eflags) && !polarity_change &&
-	    (READ_ONCE(line->desc->debounce_period_us) == debounce_period_us))
+	    (READ_ONCE(line->desc->debounce_period_us) == debounce_period_us)
+	    && !hte_change)
 		return 0;
 
 	/* sw debounced and still will be...*/
@@ -851,11 +1017,12 @@ static int edge_detector_update(struct line *line,
 	}
 
 	/* reconfiguring edge detection or sw debounce being disabled */
-	if ((line->irq && !READ_ONCE(line->sw_debounced)) ||
+	if ((line->irq && !READ_ONCE(line->sw_debounced)) || prev_hte_flag ||
 	    (!debounce_period_us && READ_ONCE(line->sw_debounced)))
-		edge_detector_stop(line);
+		edge_detector_stop(line, prev_hte_flag);
 
-	return edge_detector_setup(line, lc, line_idx, eflags);
+	return edge_detector_setup(line, lc, line_idx, eflags,
+				   flags & GPIO_V2_LINE_FLAG_EVENT_CLOCK_HTE);
 }
 
 static u64 gpio_v2_line_config_flags(struct gpio_v2_line_config *lc,
@@ -891,7 +1058,6 @@ static int gpio_v2_line_flags_validate(u64 flags)
 	/* Return an error if an unknown flag is set */
 	if (flags & ~GPIO_V2_LINE_VALID_FLAGS)
 		return -EINVAL;
-
 	/*
 	 * Do not allow both INPUT and OUTPUT flags to be set as they are
 	 * contradictory.
@@ -900,6 +1066,11 @@ static int gpio_v2_line_flags_validate(u64 flags)
 	    (flags & GPIO_V2_LINE_FLAG_OUTPUT))
 		return -EINVAL;
 
+	/* Only allow one event clock source */
+	if ((flags & GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME) &&
+	    (flags & GPIO_V2_LINE_FLAG_EVENT_CLOCK_HTE))
+		return -EINVAL;
+
 	/* Edge detection requires explicit input. */
 	if ((flags & GPIO_V2_LINE_EDGE_FLAGS) &&
 	    !(flags & GPIO_V2_LINE_FLAG_INPUT))
@@ -992,6 +1163,8 @@ static void gpio_v2_line_config_flags_to_desc_flags(u64 flags,
 
 	assign_bit(FLAG_EVENT_CLOCK_REALTIME, flagsp,
 		   flags & GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME);
+	assign_bit(FLAG_EVENT_CLOCK_HTE, flagsp,
+		   flags & GPIO_V2_LINE_FLAG_EVENT_CLOCK_HTE);
 }
 
 static long linereq_get_values(struct linereq *lr, void __user *ip)
@@ -1121,6 +1294,7 @@ static long linereq_set_config_unlocked(struct linereq *lr,
 	unsigned int i;
 	u64 flags;
 	bool polarity_change;
+	bool prev_hte_flag;
 	int ret;
 
 	for (i = 0; i < lr->num_lines; i++) {
@@ -1130,6 +1304,8 @@ static long linereq_set_config_unlocked(struct linereq *lr,
 			(!!test_bit(FLAG_ACTIVE_LOW, &desc->flags) !=
 			 ((flags & GPIO_V2_LINE_FLAG_ACTIVE_LOW) != 0));
 
+		prev_hte_flag = !!test_bit(FLAG_EVENT_CLOCK_HTE, &desc->flags);
+
 		gpio_v2_line_config_flags_to_desc_flags(flags, &desc->flags);
 		/*
 		 * Lines have to be requested explicitly for input
@@ -1138,7 +1314,7 @@ static long linereq_set_config_unlocked(struct linereq *lr,
 		if (flags & GPIO_V2_LINE_FLAG_OUTPUT) {
 			int val = gpio_v2_line_config_output_value(lc, i);
 
-			edge_detector_stop(&lr->lines[i]);
+			edge_detector_stop(&lr->lines[i], prev_hte_flag);
 			ret = gpiod_direction_output(desc, val);
 			if (ret)
 				return ret;
@@ -1148,8 +1324,7 @@ static long linereq_set_config_unlocked(struct linereq *lr,
 				return ret;
 
 			ret = edge_detector_update(&lr->lines[i], lc, i,
-					flags & GPIO_V2_LINE_EDGE_FLAGS,
-					polarity_change);
+					flags, polarity_change, prev_hte_flag);
 			if (ret)
 				return ret;
 		}
@@ -1278,9 +1453,12 @@ static ssize_t linereq_read(struct file *file,
 static void linereq_free(struct linereq *lr)
 {
 	unsigned int i;
+	bool hte;
 
 	for (i = 0; i < lr->num_lines; i++) {
-		edge_detector_stop(&lr->lines[i]);
+		hte = !!test_bit(FLAG_EVENT_CLOCK_HTE,
+				 &lr->lines[i].desc->flags);
+		edge_detector_stop(&lr->lines[i], hte);
 		if (lr->lines[i].desc)
 			gpiod_free(lr->lines[i].desc);
 	}
@@ -1406,7 +1584,8 @@ static int linereq_create(struct gpio_device *gdev, void __user *ip)
 				goto out_free_linereq;
 
 			ret = edge_detector_setup(&lr->lines[i], lc, i,
-					flags & GPIO_V2_LINE_EDGE_FLAGS);
+				flags & GPIO_V2_LINE_EDGE_FLAGS,
+				flags & GPIO_V2_LINE_FLAG_EVENT_CLOCK_HTE);
 			if (ret)
 				goto out_free_linereq;
 		}
@@ -1959,6 +2138,8 @@ static void gpio_desc_to_lineinfo(struct gpio_desc *desc,
 
 	if (test_bit(FLAG_EVENT_CLOCK_REALTIME, &desc->flags))
 		info->flags |= GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME;
+	else if (test_bit(FLAG_EVENT_CLOCK_HTE, &desc->flags))
+		info->flags |= GPIO_V2_LINE_FLAG_EVENT_CLOCK_HTE;
 
 	debounce_period_us = READ_ONCE(desc->debounce_period_us);
 	if (debounce_period_us) {
diff --git a/include/uapi/linux/gpio.h b/include/uapi/linux/gpio.h
index eaaea3d8e6b4..cb9966d49a16 100644
--- a/include/uapi/linux/gpio.h
+++ b/include/uapi/linux/gpio.h
@@ -66,6 +66,8 @@ struct gpiochip_info {
  * @GPIO_V2_LINE_FLAG_BIAS_PULL_DOWN: line has pull-down bias enabled
  * @GPIO_V2_LINE_FLAG_BIAS_DISABLED: line has bias disabled
  * @GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME: line events contain REALTIME timestamps
+ * @GPIO_V2_LINE_FLAG_EVENT_CLOCK_HTE: line events contain timestamps from
+ * hardware timestamp engine
  */
 enum gpio_v2_line_flag {
 	GPIO_V2_LINE_FLAG_USED			= _BITULL(0),
@@ -80,6 +82,7 @@ enum gpio_v2_line_flag {
 	GPIO_V2_LINE_FLAG_BIAS_PULL_DOWN	= _BITULL(9),
 	GPIO_V2_LINE_FLAG_BIAS_DISABLED		= _BITULL(10),
 	GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME	= _BITULL(11),
+	GPIO_V2_LINE_FLAG_EVENT_CLOCK_HTE	= _BITULL(12),
 };
 
 /**

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From: Dipen Patel <dipenp@nvidia.com>
To: <smangipudi@nvidia.com>, <thierry.reding@gmail.com>,
        <jonathanh@nvidia.com>, <linux-kernel@vger.kernel.org>,
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CC: Dipen Patel <dipenp@nvidia.com>
Subject: [RFC v4 09/11] tools: gpio: Add new hardware clock type
Date: Mon, 17 Jan 2022 16:22:12 -0800
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gpiolib-cdev is extended to support hardware clock type, this
patch reflects that fact.

Signed-off-by: Dipen Patel <dipenp@nvidia.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
---
 tools/gpio/gpio-event-mon.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/gpio/gpio-event-mon.c b/tools/gpio/gpio-event-mon.c
index a2b233fdb572..6c122952c589 100644
--- a/tools/gpio/gpio-event-mon.c
+++ b/tools/gpio/gpio-event-mon.c
@@ -149,6 +149,7 @@ void print_usage(void)
 		"  -r         Listen for rising edges\n"
 		"  -f         Listen for falling edges\n"
 		"  -w         Report the wall-clock time for events\n"
+		"  -t         Report the hardware timestamp for events\n"
 		"  -b <n>     Debounce the line with period n microseconds\n"
 		" [-c <n>]    Do <n> loops (optional, infinite loop if not stated)\n"
 		"  -?         This helptext\n"
@@ -174,7 +175,7 @@ int main(int argc, char **argv)
 
 	memset(&config, 0, sizeof(config));
 	config.flags = GPIO_V2_LINE_FLAG_INPUT;
-	while ((c = getopt(argc, argv, "c:n:o:b:dsrfw?")) != -1) {
+	while ((c = getopt(argc, argv, "c:n:o:b:dsrfwt?")) != -1) {
 		switch (c) {
 		case 'c':
 			loops = strtoul(optarg, NULL, 10);
@@ -208,6 +209,9 @@ int main(int argc, char **argv)
 		case 'w':
 			config.flags |= GPIO_V2_LINE_FLAG_EVENT_CLOCK_REALTIME;
 			break;
+		case 't':
+			config.flags |= GPIO_V2_LINE_FLAG_EVENT_CLOCK_HTE;
+			break;
 		case '?':
 			print_usage();
 			return -1;

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From: Dipen Patel <dipenp@nvidia.com>
To: <smangipudi@nvidia.com>, <thierry.reding@gmail.com>,
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CC: Dipen Patel <dipenp@nvidia.com>
Subject: [RFC v4 10/11] hte: Add tegra GPIO HTE test driver
Date: Mon, 17 Jan 2022 16:22:13 -0800
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Tegra194 AON GPIO controller supports hardware timestamping
through its HTE known as Generic timestamping Engine(GTE).
This kernel space gpio consumer test driver demonstrates HTE
functionality. During probe it registers sysfs
interface /sys/kernel/tegra_hte_gpio_test/gpio_en_dis. The value 1
enables gpio line for the HTE functionality while the value 0
disables that.

The test driver can be compiled as a module and takes optional
parameters gpio_out and gpio_in of type uint that specifies logical
GPIO numbers.

This patch also adds compilation support in Kconfig and Makefile.

Signed-off-by: Dipen Patel <dipenp@nvidia.com>
---
Changes in v3:
- Addressed grammatical errors.

Changes in v4:
- Reflected HTE and GPIOLIB subsytem API changes.

 drivers/hte/Kconfig                  |   9 +
 drivers/hte/Makefile                 |   1 +
 drivers/hte/hte-tegra194-gpio-test.c | 273 +++++++++++++++++++++++++++
 3 files changed, 283 insertions(+)
 create mode 100644 drivers/hte/hte-tegra194-gpio-test.c

diff --git a/drivers/hte/Kconfig b/drivers/hte/Kconfig
index dee8b7a2b980..f20f38ae172b 100644
--- a/drivers/hte/Kconfig
+++ b/drivers/hte/Kconfig
@@ -38,4 +38,13 @@ config HTE_TEGRA194_IRQ_TEST
 	  The NVIDIA Tegra194 GTE IRQ test driver demonstrates HTE subsystem
 	  usage for the LIC IRQ hardware timestamp.
 
+config HTE_TEGRA194_GPIO_TEST
+        tristate "NVIDIA Tegra194 HTE GPIO Test"
+        depends on HTE_TEGRA194
+        help
+	  The NVIDIA Tegra194 GTE GPIO test driver demonstrates how to use the HTE
+	  subsystem indirectly through gpiolib API calls for GPIO lines for the
+	  hardware-assisted timestamping.
+
 endif
+
diff --git a/drivers/hte/Makefile b/drivers/hte/Makefile
index 75b7932c2ffc..1d12f3a36709 100644
--- a/drivers/hte/Makefile
+++ b/drivers/hte/Makefile
@@ -1,4 +1,5 @@
 obj-$(CONFIG_HTE)		+= hte.o
 obj-$(CONFIG_HTE_TEGRA194)	+= hte-tegra194.o
 obj-$(CONFIG_HTE_TEGRA194_IRQ_TEST) += hte-tegra194-irq-test.o
+obj-$(CONFIG_HTE_TEGRA194_GPIO_TEST) += hte-tegra194-gpio-test.o
 
diff --git a/drivers/hte/hte-tegra194-gpio-test.c b/drivers/hte/hte-tegra194-gpio-test.c
new file mode 100644
index 000000000000..dee5a687e21a
--- /dev/null
+++ b/drivers/hte/hte-tegra194-gpio-test.c
@@ -0,0 +1,273 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2021-2022 NVIDIA Corporation
+ *
+ * Author: Dipen Patel <dipenp@nvidia.com>
+ */
+
+#include <linux/version.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+#include <linux/timer.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+#include <linux/hte.h>
+
+/*
+ * Tegra194 On chip HTE (hardware timestamping engine) also known as GTE
+ * (generic timestamping engine) can monitor subset of GPIO lines for the event
+ * and timestamp accordingly.
+ *
+ * This sample HTE GPIO test driver demonstrates HTE API usage by enabling
+ * hardware timestamp on gpio_in line which is configured as rising edge.
+ *
+ * Note: gpio_out and gpio_in need to be shorted externally in order for this
+ * test driver to work for the GPIO monitoring. The test driver has been
+ * tested on Jetson AGX Xavier platform by shorting pin 32 and 16 on 40 pin
+ * header. The gpio_out and gpio_in can be passed as parameter during module
+ * loading.
+ *
+ * How to run test driver:
+ * - Load test driver
+ * - echo 1 >/sys/kernel/tegra_hte_gpio_test/gpio_en_dis, sends request to HTE
+ * - echo 0 >/sys/kernel/tegra_hte_gpio_test/gpio_en_dis or unloading sends
+ *   release request to HTE.
+ * - Once requested, at regular interval gpio_out pin toggles triggering
+ *   HTE for rising edge on gpio_in pin. It will print message as below:
+ *   GPIO HW timestamp(1): <timestamp>, edge: rising.
+ */
+
+static unsigned int gpio_in = 322;
+module_param(gpio_in, uint, 0660);
+
+static unsigned int gpio_out = 321;
+module_param(gpio_out, uint, 0660);
+
+static struct tegra_hte_test {
+	bool is_ts_en;
+	int gpio_in_irq;
+	struct gpio_desc *gpio_in;
+	struct gpio_desc *gpio_out;
+	struct hte_ts_desc desc;
+	struct timer_list timer;
+	struct kobject *kobj;
+} hte;
+
+static hte_return_t process_hw_ts(struct hte_ts_data *ts, void *p)
+{
+	char *edge;
+	(void)p;
+
+	if (!ts)
+		return HTE_CB_HANDLED;
+
+	if (ts->raw_level < 0)
+		edge = "Unknown";
+
+	pr_info("GPIO HW timestamp(%llu): %llu, edge: %s\n", ts->seq, ts->tsc,
+		(ts->raw_level >= 0) ? ((ts->raw_level == 0) ?
+					"falling" : "rising") : edge);
+
+	return HTE_CB_HANDLED;
+}
+
+/*
+ * Sysfs attribute to request/release HTE gpio line
+ */
+static ssize_t store_gpio_en_dis(struct kobject *kobj,
+				 struct kobj_attribute *attr,
+				 const char *buf, size_t count)
+{
+	int ret = count;
+	unsigned long val = 0;
+	(void)kobj;
+	(void)attr;
+
+	if (kstrtoul(buf, 10, &val) < 0) {
+		ret = -EINVAL;
+		goto error;
+	}
+
+	if (val == 1) {
+		if (hte.is_ts_en) {
+			ret = -EEXIST;
+			goto error;
+		}
+
+		hte.desc.attr.line_data = hte.gpio_in;
+		hte.desc.attr.line_id = desc_to_gpio(hte.gpio_in);
+		/*
+		 * Driver requests irq which implicitly specifies the edges
+		 * for HTE subsystem, no need to setup through HTE
+		 */
+		hte.desc.attr.edge_flags = HTE_EDGE_NO_SETUP;
+		hte.desc.attr.name = "gte_gpio";
+
+		ret = hte_req_ts_by_linedata_ns(&hte.desc, process_hw_ts,
+						NULL, NULL);
+		if (ret)
+			goto error;
+
+		hte.is_ts_en = true;
+	} else if (val == 0) {
+		if (!hte.is_ts_en) {
+			ret = -EINVAL;
+			goto error;
+		}
+		ret = hte_release_ts(&hte.desc);
+		if (ret)
+			goto error;
+
+		hte.is_ts_en = false;
+	}
+
+	ret = count;
+
+error:
+	return ret;
+}
+
+struct kobj_attribute gpio_en_dis_attr =
+		__ATTR(gpio_en_dis, 0220, NULL, store_gpio_en_dis);
+
+static struct attribute *attrs[] = {
+	&gpio_en_dis_attr.attr,
+	NULL,
+};
+
+static struct attribute_group tegra_hte_test_attr_group = {
+	.attrs = attrs,
+};
+
+static int tegra_hte_test_sysfs_create(void)
+{
+	int ret;
+
+	/* Creates /sys/kernel/tegra_hte_gpio_test */
+	hte.kobj = kobject_create_and_add("tegra_hte_gpio_test", kernel_kobj);
+	if (!hte.kobj)
+		return -ENOMEM;
+
+	ret = sysfs_create_group(hte.kobj, &tegra_hte_test_attr_group);
+	if (ret)
+		kobject_put(hte.kobj);
+	return ret;
+}
+
+static void gpio_timer_cb(struct timer_list *t)
+{
+	(void)t;
+
+	gpiod_set_value(hte.gpio_out, !gpiod_get_value(hte.gpio_out));
+	mod_timer(&hte.timer, jiffies + msecs_to_jiffies(8000));
+}
+
+static irqreturn_t tegra_hte_test_gpio_isr(int irq, void *data)
+{
+	(void)irq;
+	(void)data;
+
+	return IRQ_HANDLED;
+}
+
+static int __init tegra_hte_gpio_test_init(void)
+{
+	int ret = 0;
+
+	ret = gpio_request(gpio_out, "gte_test_gpio_out");
+	if (ret) {
+		pr_err("failed request gpio out\n");
+		return -EINVAL;
+	}
+
+	ret = gpio_request(gpio_in, "gte_test_gpio_in");
+	if (ret) {
+		pr_err("failed request gpio in\n");
+		ret = -EINVAL;
+		goto free_gpio_out;
+	}
+
+	hte.gpio_out = gpio_to_desc(gpio_out);
+	if (!hte.gpio_out) {
+		pr_err("failed convert gpio out to desc\n");
+		ret = -EINVAL;
+		goto free_gpio_in;
+	}
+
+	hte.gpio_in = gpio_to_desc(gpio_in);
+	if (!hte.gpio_in) {
+		pr_err("failed convert gpio in to desc\n");
+		ret = -EINVAL;
+		goto free_gpio_in;
+	}
+
+	ret = gpiod_direction_output(hte.gpio_out, 0);
+	if (ret) {
+		pr_err("failed to set output\n");
+		ret = -EINVAL;
+		goto free_gpio_in;
+	}
+
+	ret = gpiod_direction_input(hte.gpio_in);
+	if (ret) {
+		pr_err("failed to set input\n");
+		ret = -EINVAL;
+		goto free_gpio_in;
+	}
+
+	ret = gpiod_to_irq(hte.gpio_in);
+	if (ret < 0) {
+		pr_err("failed to map GPIO to IRQ: %d\n", ret);
+		ret = -ENXIO;
+		goto free_gpio_in;
+	}
+
+	hte.gpio_in_irq = ret;
+	ret = request_irq(ret, tegra_hte_test_gpio_isr,
+			  IRQF_TRIGGER_RISING,
+			  "tegra_hte_gpio_test_isr", &hte);
+	if (ret) {
+		pr_err("failed to acquire IRQ\n");
+		ret = -ENXIO;
+		goto free_irq;
+	}
+
+	ret = tegra_hte_test_sysfs_create();
+	if (ret != 0) {
+		pr_err("sysfs creation failed\n");
+		ret = -ENXIO;
+		goto free_irq;
+	}
+
+	timer_setup(&hte.timer, gpio_timer_cb, 0);
+	mod_timer(&hte.timer, jiffies + msecs_to_jiffies(5000));
+
+	return 0;
+
+free_irq:
+	free_irq(hte.gpio_in_irq, &hte);
+free_gpio_in:
+	gpio_free(gpio_in);
+free_gpio_out:
+	gpio_free(gpio_out);
+
+	return ret;
+}
+
+static void __exit tegra_hte_gpio_test_exit(void)
+{
+	free_irq(hte.gpio_in_irq, &hte);
+	gpio_free(gpio_in);
+	gpio_free(gpio_out);
+	hte_release_ts(&hte.desc);
+	kobject_put(hte.kobj);
+	del_timer(&hte.timer);
+}
+
+module_init(tegra_hte_gpio_test_init);
+module_exit(tegra_hte_gpio_test_exit);
+MODULE_AUTHOR("Dipen Patel <dipenp@nvidia.com>");
+MODULE_LICENSE("GPL v2");

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Subject: [RFC v4 11/11] MAINTAINERS: Added HTE Subsystem
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Added myself as a maintainer for this new Hardware Timestamping Engine
(HTE) subsystem.

Signed-off-by: Dipen Patel <dipenp@nvidia.com>
---
Changes in v3:
- Followed guidelines for the "M" field.
- Removed "*" in "F" field.

 MAINTAINERS | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index c87a3f5e302a..1a3705fa7163 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8811,6 +8811,14 @@ L:	linux-input@vger.kernel.org
 S:	Maintained
 F:	drivers/input/touchscreen/htcpen.c
 
+HTE SUBSYSTEM
+M:	Dipen Patel <dipenp@nvidia.com>
+S:	Maintained
+F:	drivers/hte/
+F:	include/linux/hte.h
+F:	Documentation/hte/
+F:	Documentation/devicetree/bindings/hte/
+
 HTS221 TEMPERATURE-HUMIDITY IIO DRIVER
 M:	Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
 L:	linux-iio@vger.kernel.org