@@ -23,6 +23,18 @@ config PINCTRL_TEGRA210
bool
select PINCTRL_TEGRA
+config PINCTRL_TEGRA_IO_PAD
+ bool "Tegra IO pad Control Driver"
+ depends on ARCH_TEGRA && REGULATOR
+ select PINCONF
+ select PINMUX
+ help
+ NVIDIA Tegra124/210 SoC has IO pads which supports multi-voltage
+ level of interfacing and deep power down mode of IO pads. The
+ voltage of IO pads are SW configurable based on IO rail of that
+ pads on T210. This driver provides the interface to change IO pad
+ voltage and power state via pincontrol interface.
+
config PINCTRL_TEGRA_XUSB
def_bool y if ARCH_TEGRA
select GENERIC_PHY
@@ -4,4 +4,5 @@ obj-$(CONFIG_PINCTRL_TEGRA30) += pinctrl-tegra30.o
obj-$(CONFIG_PINCTRL_TEGRA114) += pinctrl-tegra114.o
obj-$(CONFIG_PINCTRL_TEGRA124) += pinctrl-tegra124.o
obj-$(CONFIG_PINCTRL_TEGRA210) += pinctrl-tegra210.o
+obj-$(CONFIG_PINCTRL_TEGRA_IO_PAD) += pinctrl-tegra-io-pad.o
obj-$(CONFIG_PINCTRL_TEGRA_XUSB) += pinctrl-tegra-xusb.o
new file mode 100644
@@ -0,0 +1,530 @@
+/*
+ * pinctrl-tegra-io-pad: IO PAD driver for configuration of IO rail and deep
+ * Power Down mode via pinctrl framework.
+ *
+ * Copyright (C) 2016 NVIDIA CORPORATION. All rights reserved.
+ *
+ * Author: Laxman Dewangan <ldewangan@nvidia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <soc/tegra/pmc.h>
+
+#include "../core.h"
+#include "../pinconf.h"
+#include "../pinctrl-utils.h"
+
+#define TEGRA_IO_RAIL_1800000UV 1800000
+#define TEGRA_IO_RAIL_3300000UV 3300000
+
+/* Covert IO voltage to IO pad voltage enum */
+#define tegra_io_uv_to_io_pads_uv(io_uv) \
+ (((io_uv) == TEGRA_IO_RAIL_1800000UV) ? \
+ TEGRA_IO_PAD_1800000UV : TEGRA_IO_PAD_3300000UV)
+
+#define tegra_io_voltage_is_valid(io_uv) \
+ ({ typeof(io_uv) io_uv_ = (io_uv); \
+ ((io_uv_ == TEGRA_IO_RAIL_1800000UV) || \
+ (io_uv_ == TEGRA_IO_RAIL_3300000UV)); })
+
+struct tegra_io_pads_cfg {
+ const char *name;
+ const unsigned int pins[1];
+ const char *vsupply;
+ enum tegra_io_pad id;
+ bool supports_low_power;
+};
+
+struct tegra_io_pads_soc_data {
+ const struct tegra_io_pads_cfg *cfg;
+ int num_cfg;
+ const struct pinctrl_pin_desc *desc;
+ int num_desc;
+};
+
+struct tegra_io_pads_info {
+ struct device *dev;
+ struct pinctrl_dev *pctl;
+ const struct tegra_io_pads_soc_data *soc_data;
+};
+
+struct tegra_io_pads_regulator_info {
+ struct tegra_io_pads_info *tiopi;
+ const struct tegra_io_pads_cfg *cfg;
+ struct regulator *regulator;
+ struct notifier_block regulator_nb;
+};
+
+static int tegra_io_pads_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+ struct tegra_io_pads_info *tiopi = pinctrl_dev_get_drvdata(pctldev);
+
+ return tiopi->soc_data->num_cfg;
+}
+
+static const char *tegra_io_pads_pinctrl_get_group_name(
+ struct pinctrl_dev *pctldev, unsigned int group)
+{
+ struct tegra_io_pads_info *tiopi = pinctrl_dev_get_drvdata(pctldev);
+
+ return tiopi->soc_data->cfg[group].name;
+}
+
+static int tegra_io_pads_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
+ unsigned int group,
+ const unsigned int **pins,
+ unsigned int *num_pins)
+{
+ struct tegra_io_pads_info *tiopi = pinctrl_dev_get_drvdata(pctldev);
+
+ *pins = tiopi->soc_data->cfg[group].pins;
+ *num_pins = 1;
+
+ return 0;
+}
+
+static const struct pinctrl_ops tegra_io_pads_pinctrl_ops = {
+ .get_groups_count = tegra_io_pads_pinctrl_get_groups_count,
+ .get_group_name = tegra_io_pads_pinctrl_get_group_name,
+ .get_group_pins = tegra_io_pads_pinctrl_get_group_pins,
+ .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+ .dt_free_map = pinctrl_utils_free_map,
+};
+
+static int tegra_io_pads_pinconf_get(struct pinctrl_dev *pctldev,
+ unsigned int pin, unsigned long *config)
+{
+ struct tegra_io_pads_info *tiopi = pinctrl_dev_get_drvdata(pctldev);
+ int param = pinconf_to_config_param(*config);
+ const struct tegra_io_pads_cfg *cfg = &tiopi->soc_data->cfg[pin];
+ int arg = 0;
+ int ret;
+
+ switch (param) {
+ case PIN_CONFIG_LOW_POWER_MODE:
+ if (!cfg->supports_low_power) {
+ dev_err(tiopi->dev,
+ "IO pad %s does not support low power\n",
+ cfg->name);
+ return -EINVAL;
+ }
+
+ ret = tegra_io_pad_power_get_status(cfg->id);
+ if (ret < 0)
+ return ret;
+ arg = !ret;
+ break;
+
+ default:
+ dev_err(tiopi->dev, "The parameter %d not supported\n", param);
+ return -EINVAL;
+ }
+
+ *config = pinconf_to_config_packed(param, (u16)arg);
+
+ return 0;
+}
+
+static int tegra_io_pads_pinconf_set(struct pinctrl_dev *pctldev,
+ unsigned int pin, unsigned long *configs,
+ unsigned int num_configs)
+{
+ struct tegra_io_pads_info *tiopi = pinctrl_dev_get_drvdata(pctldev);
+ const struct tegra_io_pads_cfg *cfg = &tiopi->soc_data->cfg[pin];
+ int i;
+
+ for (i = 0; i < num_configs; i++) {
+ int ret;
+ int param = pinconf_to_config_param(configs[i]);
+ u16 param_val = pinconf_to_config_argument(configs[i]);
+
+ switch (param) {
+ case PIN_CONFIG_LOW_POWER_MODE:
+ if (!cfg->supports_low_power) {
+ dev_err(tiopi->dev,
+ "IO pad %s does not support low power\n",
+ cfg->name);
+ return -EINVAL;
+ }
+ if (param_val)
+ ret = tegra_io_pad_power_disable(cfg->id);
+ else
+ ret = tegra_io_pad_power_enable(cfg->id);
+ if (ret < 0) {
+ dev_err(tiopi->dev,
+ "Failed to set DPD %d of io-pad %s: %d\n",
+ param_val, cfg->name, ret);
+ return ret;
+ }
+ break;
+
+ default:
+ dev_err(tiopi->dev, "The parameter %d not supported\n",
+ param);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static const struct pinconf_ops tegra_io_pads_pinconf_ops = {
+ .pin_config_get = tegra_io_pads_pinconf_get,
+ .pin_config_set = tegra_io_pads_pinconf_set,
+};
+
+static struct pinctrl_desc tegra_io_pads_pinctrl_desc = {
+ .name = "pinctrl-tegra-io-pads",
+ .pctlops = &tegra_io_pads_pinctrl_ops,
+ .confops = &tegra_io_pads_pinconf_ops,
+};
+
+static int tegra_io_pads_rail_change_notify_cb(struct notifier_block *nb,
+ unsigned long event, void *data)
+{
+ struct tegra_io_pads_regulator_info *rinfo;
+ struct pre_voltage_change_data *vdata;
+ unsigned long int io_volt_uv;
+ enum tegra_io_pad_voltage pad_volt;
+ int ret;
+
+ rinfo = container_of(nb, struct tegra_io_pads_regulator_info,
+ regulator_nb);
+
+ switch (event) {
+ case REGULATOR_EVENT_PRE_VOLTAGE_CHANGE:
+ vdata = data;
+
+ if (!tegra_io_voltage_is_valid(vdata->old_uV) ||
+ !tegra_io_voltage_is_valid(vdata->min_uV)) {
+ dev_err(rinfo->tiopi->dev,
+ "IO rail %s voltage is not 1.8/3.3V: %lu:%lu\n",
+ rinfo->cfg->name, vdata->old_uV, vdata->min_uV);
+ return -EINVAL;
+ }
+
+ /**
+ * Change IO pad voltage before changing IO voltage when it
+ * changes from 1.8V to 3.3V
+ */
+ if (vdata->min_uV == TEGRA_IO_RAIL_1800000UV)
+ break;
+
+ ret = tegra_io_pad_set_voltage(rinfo->cfg->id,
+ TEGRA_IO_PAD_3300000UV);
+ if (ret < 0) {
+ dev_err(rinfo->tiopi->dev,
+ "Failed to set voltage %lu of pad %s: %d\n",
+ vdata->min_uV, rinfo->cfg->name, ret);
+ return ret;
+ }
+ break;
+
+ case REGULATOR_EVENT_VOLTAGE_CHANGE:
+ io_volt_uv = (unsigned long)data;
+ ret = tegra_io_pad_get_voltage(rinfo->cfg->id);
+ if (ret < 0) {
+ dev_err(rinfo->tiopi->dev,
+ "Failed to get IO pad voltage: %d\n", ret);
+ return ret;
+ }
+
+ if (!tegra_io_voltage_is_valid(io_volt_uv)) {
+ dev_err(rinfo->tiopi->dev,
+ "IO rail %s voltage is not 1.8/3.3V: %lu\n",
+ rinfo->cfg->name, io_volt_uv);
+ return -EINVAL;
+ }
+
+ /*
+ * If IO pad configuration matching with IO rail voltage then
+ * do nothing.
+ */
+ if (((io_volt_uv == TEGRA_IO_RAIL_1800000UV) &&
+ (ret == TEGRA_IO_PAD_1800000UV)) ||
+ ((io_volt_uv == TEGRA_IO_RAIL_3300000UV) &&
+ (ret == TEGRA_IO_PAD_3300000UV)))
+ break;
+
+ ret = tegra_io_pad_set_voltage(rinfo->cfg->id,
+ TEGRA_IO_PAD_1800000UV);
+ if (ret < 0) {
+ dev_err(rinfo->tiopi->dev,
+ "Failed to set voltage %lu of pad %s: %d\n",
+ vdata->min_uV, rinfo->cfg->name, ret);
+ return ret;
+ }
+ break;
+
+ case REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE:
+ io_volt_uv = (unsigned long)data;
+
+ if (!tegra_io_voltage_is_valid(io_volt_uv)) {
+ dev_err(rinfo->tiopi->dev,
+ "IO rail %s voltage is not 1.8/3.3V: %lu\n",
+ rinfo->cfg->name, io_volt_uv);
+ return -EINVAL;
+ }
+
+ pad_volt = tegra_io_uv_to_io_pads_uv(io_volt_uv);
+ ret = tegra_io_pad_set_voltage(rinfo->cfg->id, pad_volt);
+ if (ret < 0) {
+ dev_err(rinfo->tiopi->dev,
+ "Failed to set voltage %lu of pad %s: %d\n",
+ io_volt_uv, rinfo->cfg->name, ret);
+ return ret;
+ }
+ break;
+
+ default:
+ break;
+ }
+
+ return NOTIFY_OK;
+}
+
+static int tegra_io_pads_pinctrl_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ const struct platform_device_id *id = platform_get_device_id(pdev);
+ const struct tegra_io_pads_soc_data *soc_data =
+ (const struct tegra_io_pads_soc_data *)id->driver_data;
+ struct tegra_io_pads_info *tiopi;
+ int ret, i;
+
+ if (!pdev->dev.parent->of_node) {
+ dev_err(dev, "PMC should be register from DT\n");
+ return -ENODEV;
+ }
+
+ tiopi = devm_kzalloc(dev, sizeof(*tiopi), GFP_KERNEL);
+ if (!tiopi)
+ return -ENOMEM;
+
+ tiopi->dev = &pdev->dev;
+ pdev->dev.of_node = pdev->dev.parent->of_node;
+ tiopi->soc_data = soc_data;
+
+ for (i = 0; i < soc_data->num_cfg; ++i) {
+ struct tegra_io_pads_regulator_info *rinfo;
+ enum tegra_io_pad_voltage pad_volt;
+ int io_volt_uv;
+
+ if (!soc_data->cfg[i].vsupply)
+ continue;
+
+ rinfo = devm_kzalloc(dev, sizeof(*rinfo), GFP_KERNEL);
+ if (!rinfo)
+ return -ENOMEM;
+
+ rinfo->tiopi = tiopi;
+ rinfo->cfg = &soc_data->cfg[i];
+
+ rinfo->regulator = devm_regulator_get_optional(dev,
+ soc_data->cfg[i].vsupply);
+ if (IS_ERR(rinfo->regulator)) {
+ ret = PTR_ERR(rinfo->regulator);
+ if (ret == -EPROBE_DEFER)
+ return ret;
+ continue;
+ }
+
+ io_volt_uv = regulator_get_voltage(rinfo->regulator);
+ if (io_volt_uv < 0) {
+ dev_err(dev, "Failed to get voltage for rail %s: %d\n",
+ soc_data->cfg[i].vsupply, io_volt_uv);
+ return ret;
+ }
+
+ if (!tegra_io_voltage_is_valid(io_volt_uv)) {
+ dev_err(dev, "IO rail %s voltage is not 1.8/3.3V: %d\n",
+ soc_data->cfg[i].vsupply, io_volt_uv);
+ continue;
+ }
+
+ pad_volt = tegra_io_uv_to_io_pads_uv(io_volt_uv);
+ ret = tegra_io_pad_set_voltage(soc_data->cfg[i].id, pad_volt);
+ if (ret < 0) {
+ dev_err(dev, "Failed to set voltage %d of pad %s: %d\n",
+ io_volt_uv, soc_data->cfg[i].name, ret);
+ return ret;
+ }
+
+ rinfo->regulator_nb.notifier_call =
+ tegra_io_pads_rail_change_notify_cb;
+ ret = devm_regulator_register_notifier(rinfo->regulator,
+ &rinfo->regulator_nb);
+ if (ret < 0) {
+ dev_err(dev, "Failed to register regulator %s notifier: %d\n",
+ soc_data->cfg[i].name, ret);
+ return ret;
+ }
+ }
+
+ tegra_io_pads_pinctrl_desc.pins = tiopi->soc_data->desc;
+ tegra_io_pads_pinctrl_desc.npins = tiopi->soc_data->num_desc;
+ platform_set_drvdata(pdev, tiopi);
+
+ tiopi->pctl = devm_pinctrl_register(dev, &tegra_io_pads_pinctrl_desc,
+ tiopi);
+ if (IS_ERR(tiopi->pctl)) {
+ ret = PTR_ERR(tiopi->pctl);
+ dev_err(dev, "Failed to register io-pad pinctrl driver: %d\n",
+ ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+#define TEGRA124_PAD_INFO_TABLE(_entry_) \
+ _entry_(0, "audio", AUDIO, true, NULL), \
+ _entry_(1, "bb", BB, true, NULL), \
+ _entry_(2, "cam", CAM, true, NULL), \
+ _entry_(3, "comp", COMP, true, NULL), \
+ _entry_(4, "csia", CSIA, true, NULL), \
+ _entry_(5, "csib", CSIB, true, NULL), \
+ _entry_(6, "csie", CSIE, true, NULL), \
+ _entry_(7, "dsi", DSI, true, NULL), \
+ _entry_(8, "dsib", DSIB, true, NULL), \
+ _entry_(9, "dsic", DSIC, true, NULL), \
+ _entry_(10, "dsid", DSID, true, NULL), \
+ _entry_(11, "hdmi", HDMI, true, NULL), \
+ _entry_(12, "hsic", HSIC, true, NULL), \
+ _entry_(13, "hv", HV, true, NULL), \
+ _entry_(14, "lvds", LVDS, true, NULL), \
+ _entry_(15, "mipi-bias", MIPI_BIAS, true, NULL), \
+ _entry_(16, "nand", NAND, true, NULL), \
+ _entry_(17, "pex-bias", PEX_BIAS, true, NULL), \
+ _entry_(18, "pex-clk1", PEX_CLK1, true, NULL), \
+ _entry_(19, "pex-clk2", PEX_CLK2, true, NULL), \
+ _entry_(20, "pex-ctrl", PEX_CNTRL, true, NULL), \
+ _entry_(21, "sdmmc1", SDMMC1, true, NULL), \
+ _entry_(22, "sdmmc3", SDMMC3, true, NULL), \
+ _entry_(23, "sdmmc4", SDMMC4, true, NULL), \
+ _entry_(24, "sys-ddc", SYS_DDC, true, NULL), \
+ _entry_(25, "uart", UART, true, NULL), \
+ _entry_(26, "usb0", USB0, true, NULL), \
+ _entry_(27, "usb1", USB1, true, NULL), \
+ _entry_(28, "usb2", USB2, true, NULL), \
+ _entry_(29, "usb-bias", USB_BIAS, true, NULL)
+
+#define TEGRA210_PAD_INFO_TABLE(_entry_) \
+ _entry_(0, "audio", AUDIO, true, "vddio-audio"), \
+ _entry_(1, "audio-hv", AUDIO_HV, true, "vddio-audio-hv"), \
+ _entry_(2, "cam", CAM, true, "vddio-cam"), \
+ _entry_(3, "csia", CSIA, true, NULL), \
+ _entry_(4, "csib", CSIB, true, NULL), \
+ _entry_(5, "csic", CSIC, true, NULL), \
+ _entry_(6, "csid", CSID, true, NULL), \
+ _entry_(7, "csie", CSIE, true, NULL), \
+ _entry_(8, "csif", CSIF, true, NULL), \
+ _entry_(9, "dbg", DBG, true, "vddio-dbg"), \
+ _entry_(10, "debug-nonao", DEBUG_NONAO, true, NULL), \
+ _entry_(11, "dmic", DMIC, true, "vddio-dmic"), \
+ _entry_(12, "dp", DP, true, NULL), \
+ _entry_(13, "dsi", DSI, true, NULL), \
+ _entry_(14, "dsib", DSIB, true, NULL), \
+ _entry_(15, "dsic", DSIC, true, NULL), \
+ _entry_(16, "dsid", DSID, true, NULL), \
+ _entry_(17, "emmc", SDMMC4, true, NULL), \
+ _entry_(18, "emmc2", EMMC2, true, NULL), \
+ _entry_(19, "gpio", GPIO, true, "vddio-gpio"), \
+ _entry_(20, "hdmi", HDMI, true, NULL), \
+ _entry_(21, "hsic", HSIC, true, NULL), \
+ _entry_(22, "lvds", LVDS, true, NULL), \
+ _entry_(23, "mipi-bias", MIPI_BIAS, true, NULL), \
+ _entry_(24, "pex-bias", PEX_BIAS, true, NULL), \
+ _entry_(25, "pex-clk1", PEX_CLK1, true, NULL), \
+ _entry_(26, "pex-clk2", PEX_CLK2, true, NULL), \
+ _entry_(27, "pex-ctrl", PEX_CNTRL, false, "vddio-pex-ctrl"), \
+ _entry_(28, "sdmmc1", SDMMC1, true, "vddio-sdmmc1"), \
+ _entry_(29, "sdmmc3", SDMMC3, true, "vddio-sdmmc3"), \
+ _entry_(30, "spi", SPI, true, "vddio-spi"), \
+ _entry_(31, "spi-hv", SPI_HV, true, "vddio-spi-hv"), \
+ _entry_(32, "uart", UART, true, "vddio-uart"), \
+ _entry_(33, "usb0", USB0, true, NULL), \
+ _entry_(34, "usb1", USB1, true, NULL), \
+ _entry_(35, "usb2", USB2, true, NULL), \
+ _entry_(36, "usb3", USB3, true, NULL), \
+ _entry_(37, "usb-bias", USB_BIAS, true, NULL)
+
+#define TEGRA_IO_PAD_INFO(_pin, _name, _id, _lpstate, _vsupply) \
+ { \
+ .name = _name, \
+ .pins = {(_pin)}, \
+ .id = TEGRA_IO_PAD_##_id, \
+ .vsupply = (_vsupply), \
+ .supports_low_power = (_lpstate), \
+ }
+
+static const struct tegra_io_pads_cfg tegra124_io_pads_cfg_info[] = {
+ TEGRA124_PAD_INFO_TABLE(TEGRA_IO_PAD_INFO),
+};
+
+static const struct tegra_io_pads_cfg tegra210_io_pads_cfg_info[] = {
+ TEGRA210_PAD_INFO_TABLE(TEGRA_IO_PAD_INFO),
+};
+
+#define TEGRA_IO_PAD_DESC(_pin, _name, _id, _lpstate, _vsupply) \
+ PINCTRL_PIN(_pin, _name)
+
+static const struct pinctrl_pin_desc tegra124_io_pads_pinctrl_desc[] = {
+ TEGRA124_PAD_INFO_TABLE(TEGRA_IO_PAD_DESC),
+};
+
+static const struct pinctrl_pin_desc tegra210_io_pads_pinctrl_desc[] = {
+ TEGRA210_PAD_INFO_TABLE(TEGRA_IO_PAD_DESC),
+};
+
+static const struct tegra_io_pads_soc_data tegra124_io_pad_soc_data = {
+ .desc = tegra124_io_pads_pinctrl_desc,
+ .num_desc = ARRAY_SIZE(tegra124_io_pads_pinctrl_desc),
+ .cfg = tegra124_io_pads_cfg_info,
+ .num_cfg = ARRAY_SIZE(tegra124_io_pads_cfg_info),
+};
+
+static const struct tegra_io_pads_soc_data tegra210_io_pad_soc_data = {
+ .desc = tegra210_io_pads_pinctrl_desc,
+ .num_desc = ARRAY_SIZE(tegra210_io_pads_pinctrl_desc),
+ .cfg = tegra210_io_pads_cfg_info,
+ .num_cfg = ARRAY_SIZE(tegra210_io_pads_cfg_info),
+};
+
+static const struct platform_device_id tegra_io_pads_dev_id[] = {
+ {
+ .name = "pinctrl-t124-io-pad",
+ .driver_data = (kernel_ulong_t)&tegra124_io_pad_soc_data,
+ }, {
+ .name = "pinctrl-t210-io-pad",
+ .driver_data = (kernel_ulong_t)&tegra210_io_pad_soc_data,
+ }, {
+ },
+};
+MODULE_DEVICE_TABLE(platform, tegra_io_pads_dev_id);
+
+static struct platform_driver tegra_io_pads_pinctrl_driver = {
+ .driver = {
+ .name = "pinctrl-tegra-io-pad",
+ },
+ .probe = tegra_io_pads_pinctrl_probe,
+ .id_table = tegra_io_pads_dev_id,
+};
+
+module_platform_driver(tegra_io_pads_pinctrl_driver);
+
+MODULE_DESCRIPTION("NVIDIA TEGRA IO pad Control Driver");
+MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
+MODULE_LICENSE("GPL v2");
NVIDIA Tegra124 and later SoCs support the multi-voltage level and low power state of some of its IO pads. The IO pads can work in the voltage of the 1.8V and 3.3V of IO voltage from IO power rail sources. When IO interfaces are not used then IO pads can be configure in low power state to reduce the power consumption from that IO pads. On Tegra124, the voltage level of IO power rail source is auto detected by hardware(SoC) and hence it is only require to configure in low power mode if IO pads are not used. On T210 onwards, the auto-detection of voltage level from IO power rail is removed from SoC and hence SW need to configure the PMC register explicitly to set proper voltage in IO pads based on IO rail power source voltage. This driver adds the IO pad driver to configure the power state and IO pad voltage based on the usage and power tree via pincontrol framework. The configuration can be static and dynamic. Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> --- Changes from V1: - Dropped the custom properties to set pad voltage and use regulator. - Added support for regulator to get vottage in boot and configure IO pad voltage. - Add support for callback to handle regulator notification and configure IO pad voltage based on voltage change. Changes from V2: Mostly nit changes per Jon's feedback i.e. use macros for voltage, added comment on macros, reduce the structure and variable name size, optimise number of variables, and allocate memory for regulator info when it needed. --- drivers/pinctrl/tegra/Kconfig | 12 + drivers/pinctrl/tegra/Makefile | 1 + drivers/pinctrl/tegra/pinctrl-tegra-io-pad.c | 530 +++++++++++++++++++++++++++ 3 files changed, 543 insertions(+) create mode 100644 drivers/pinctrl/tegra/pinctrl-tegra-io-pad.c