new file mode 100644
@@ -0,0 +1,52 @@
+Texas Instruments TI SCI Generic Power Domain
+=============================================
+
+Some TI SoCs contain a system controller (like the SYSFW, etc...) that is
+responsible for controlling the state of the IPs that are present.
+Communication between the host processor running an OS and the system
+controller happens through a protocol known as TI SCI [1].
+
+[1] http://processors.wiki.ti.com/index.php/TISCI
+
+PM Domain Node
+==============
+The PM domain node represents the global PM domain managed by the SYSFW. Because
+this relies on the TI SCI protocol to communicate with the SYSFW it must be a
+child of the sysfw node.
+
+Required Properties:
+--------------------
+- compatible: Must be "ti,sci-pm-domain"
+- #power-domain-cells: Must be 1 so that an id can be provided in each
+ device node.
+
+Example (AM65x):
+----------------
+ sysfw: sysfw {
+ compatible = "ti,am654-system-controller";
+ ...
+ k3_pds: power-controller {
+ compatible = "ti,sci-pm-domain";
+ #power-domain-cells = <1>;
+ };
+ };
+
+PM Domain Consumers
+===================
+Hardware blocks belonging to a PM domain should contain a "power-domains"
+property that is a phandle pointing to the corresponding PM domain node
+along with an index representing the device id to be passed to the PMMC
+for device control.
+
+Required Properties:
+--------------------
+- power-domains: phandle pointing to the corresponding PM domain node
+ and an ID representing the device.
+
+Example (AM65x):
+----------------
+ uart2: serial@02800000 {
+ compatible = "ti,omap4-uart";
+ ...
+ power-domains = <&k3_pds 0x3f>;
+ };
@@ -31,4 +31,11 @@ config TEGRA186_POWER_DOMAIN
Enable support for manipulating Tegra's on-SoC power domains via IPC
requests to the BPMP (Boot and Power Management Processor).
+config TI_SCI_POWER_DOMAIN
+ bool "Enable the TI SCI-based power domain driver"
+ depends on POWER_DOMAIN && TI_SCI_PROTOCOL
+ help
+ Generic power domain implementation for TI devices implementing the
+ TI SCI protocol.
+
endmenu
@@ -7,3 +7,4 @@ obj-$(CONFIG_BCM6328_POWER_DOMAIN) += bcm6328-power-domain.o
obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain.o
obj-$(CONFIG_SANDBOX_POWER_DOMAIN) += sandbox-power-domain-test.o
obj-$(CONFIG_TEGRA186_POWER_DOMAIN) += tegra186-power-domain.o
+obj-$(CONFIG_TI_SCI_POWER_DOMAIN) += ti-sci-power-domain.o
new file mode 100644
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Texas Instruments System Control Interface (TI SCI) power domain driver
+ *
+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+ * Andreas Dannenberg <dannenberg@ti.com>
+ *
+ * Loosely based on Linux kernel ti_sci_pm_domains.c...
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <power-domain-uclass.h>
+#include <linux/soc/ti/ti_sci_protocol.h>
+
+/**
+ * struct ti_sci_power_domain_data - pm domain controller information structure
+ * @sci: TI SCI handle used for communication with system controller
+ */
+struct ti_sci_power_domain_data {
+ const struct ti_sci_handle *sci;
+};
+
+static int ti_sci_power_domain_probe(struct udevice *dev)
+{
+ struct ti_sci_power_domain_data *data = dev_get_priv(dev);
+
+ debug("%s(dev=%p)\n", __func__, dev);
+
+ if (!data)
+ return -ENOMEM;
+
+ /* Store handle for communication with the system controller */
+ data->sci = ti_sci_get_handle(dev);
+ if (IS_ERR(data->sci))
+ return PTR_ERR(data->sci);
+
+ return 0;
+}
+
+static int ti_sci_power_domain_request(struct power_domain *pd)
+{
+ debug("%s(pd=%p)\n", __func__, pd);
+ return 0;
+}
+
+static int ti_sci_power_domain_free(struct power_domain *pd)
+{
+ debug("%s(pd=%p)\n", __func__, pd);
+ return 0;
+}
+
+static int ti_sci_power_domain_on(struct power_domain *pd)
+{
+ struct ti_sci_power_domain_data *data = dev_get_priv(pd->dev);
+ const struct ti_sci_handle *sci = data->sci;
+ const struct ti_sci_dev_ops *dops = &sci->ops.dev_ops;
+ int ret;
+
+ debug("%s(pd=%p)\n", __func__, pd);
+
+ ret = dops->get_device(sci, pd->id);
+ if (ret)
+ dev_err(power_domain->dev, "%s: get_device failed (%d)\n",
+ __func__, ret);
+
+ return ret;
+}
+
+static int ti_sci_power_domain_off(struct power_domain *pd)
+{
+ struct ti_sci_power_domain_data *data = dev_get_priv(pd->dev);
+ const struct ti_sci_handle *sci = data->sci;
+ const struct ti_sci_dev_ops *dops = &sci->ops.dev_ops;
+ int ret;
+
+ debug("%s(pd=%p)\n", __func__, pd);
+
+ ret = dops->put_device(sci, pd->id);
+ if (ret)
+ dev_err(power_domain->dev, "%s: put_device failed (%d)\n",
+ __func__, ret);
+
+ return ret;
+}
+
+static const struct udevice_id ti_sci_power_domain_of_match[] = {
+ { .compatible = "ti,sci-pm-domain" },
+ { /* sentinel */ }
+};
+
+static struct power_domain_ops ti_sci_power_domain_ops = {
+ .request = ti_sci_power_domain_request,
+ .free = ti_sci_power_domain_free,
+ .on = ti_sci_power_domain_on,
+ .off = ti_sci_power_domain_off,
+};
+
+U_BOOT_DRIVER(ti_sci_pm_domains) = {
+ .name = "ti-sci-pm-domains",
+ .id = UCLASS_POWER_DOMAIN,
+ .of_match = ti_sci_power_domain_of_match,
+ .probe = ti_sci_power_domain_probe,
+ .priv_auto_alloc_size = sizeof(struct ti_sci_power_domain_data),
+ .ops = &ti_sci_power_domain_ops,
+};