drivers: power_domain: Power domain TISCI driver support

Support added for power domain regulation using TISCI added for
devices using the binding ti,sci-pm-domain.
This driver relies on the TISCI layer to make calls to the
device manager core to perform power management.

Signed-off-by: Dave Joseph <d-joseph@ti.com>

drivers/power_domain/CMakeLists.txt

@@ -8,3 +8,4 @@ zephyr_library_sources_ifdef(CONFIG_POWER_DOMAIN_GPIO_MONITOR power_domain_gpio_
 zephyr_library_sources_ifdef(CONFIG_POWER_DOMAIN_INTEL_ADSP power_domain_intel_adsp.c)
 zephyr_library_sources_ifdef(CONFIG_POWER_DOMAIN_NXP_SCU power_domain_nxp_scu.c)
 zephyr_library_sources_ifdef(CONFIG_POWER_DOMAIN_SOC_PM_STATE power_domain_soc_state_change.c)
+zephyr_library_sources_ifdef(CONFIG_POWER_DOMAIN_TISCI power_domain_tisci.c)

drivers/power_domain/Kconfig

@@ -97,6 +97,30 @@ config POWER_DOMAIN_SOC_PM_STATE
 	select DEVICE_DEPS
 	help
 	  Generic power domain control to turn on/off devices when the
-	  PM subsystem transitions in and out certain power states.
+	  PM subsystem transitions in and out of certain power states.
+
+config POWER_DOMAIN_TISCI
+	bool "TISCI managed power domain"
+	default y
+	depends on DT_HAS_TI_SCI_PM_DOMAIN_ENABLED
+	help
+	  TISCI managed power domain control to turn on/off devices when the
+	  PM subsystem transitions in and out of certain power states.
+
+if POWER_DOMAIN_TISCI
+
+config POWER_DOMAIN_TISCI_INIT_PRIORITY
+	int "TISCI managed power domain init priority"
+	default 10
+	help
+	  TISCI managed power domain initialization priority.
+
+config SOC_POWER_DOMAIN_INIT
+	bool "Power domain initialization"
+	default y
+	help
+	  Power domain initialization for the SoC.
+
+endif #POWER_DOMAIN_TISCI
 
 endif

drivers/power_domain/power_domain_tisci.c

@@ -0,0 +1,105 @@
+/*
+ * Copyright 2025 Texas Instruments
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <stdbool.h>
+#include <zephyr/pm/device_runtime.h>
+#include <zephyr/pm/device.h>
+#include <zephyr/logging/log.h>
+#include <zephyr/device.h>
+#include <zephyr/drivers/firmware/tisci/tisci.h>
+LOG_MODULE_REGISTER(tisci_pd);
+
+#define DT_DRV_COMPAT ti_sci_pm_domain
+
+const struct device *dmsc = DEVICE_DT_GET_OR_NULL(DT_NODELABEL(dmsc));
+
+struct power_domain {
+	uint32_t devid;
+	bool mode;
+};
+
+static int tisci_power_domain_on(const struct power_domain *pd)
+{
+	int ret;
+
+	if (pd->mode) {
+		ret = tisci_cmd_get_device_exclusive(dmsc, pd->devid);
+	} else {
+		ret = tisci_cmd_get_device(dmsc, pd->devid);
+	}
+
+	if (ret) {
+		LOG_ERR("TISCI PM: get_device(%u) failed (%d)\n", pd->devid, ret);
+	}
+
+	return ret;
+}
+
+static int tisci_power_domain_off(const struct power_domain *pd)
+{
+	int ret = tisci_cmd_put_device(dmsc, pd->devid);
+
+	if (ret) {
+		LOG_ERR("TISCI PM: put_device(%u) failed (%d)\n", pd->devid, ret);
+	}
+
+	return ret;
+}
+
+static int tisci_pd_pm_action(const struct device *dev, enum pm_device_action action)
+{
+	const struct power_domain *data = dev->config;
+
+	LOG_DBG("TISCI PM action %d on devid %d, mode %d", action, data->devid, data->mode);
+	int ret;
+
+	switch (action) {
+	case PM_DEVICE_ACTION_RESUME:
+		ret = tisci_power_domain_on(data);
+		return ret;
+	case PM_DEVICE_ACTION_SUSPEND:
+		ret = tisci_power_domain_off(data);
+		return ret;
+	case PM_DEVICE_ACTION_TURN_ON:
+		return 0;
+	case PM_DEVICE_ACTION_TURN_OFF:
+		return 0;
+	default:
+		return -ENOTSUP;
+	}
+
+	return 0;
+}
+
+static int tisci_pd_init(const struct device *dev)
+{
+	int ret;
+
+	if (dmsc == NULL) {
+		LOG_ERR("DMSC device not found");
+		return -ENODEV;
+	}
+
+	ret = pm_device_driver_init(dev, tisci_pd_pm_action);
+	if (ret < 0) {
+		LOG_ERR("Failed to enable runtime PM: %d", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+#define TISCI_PD_DEVICE_DEFINE(inst)                                                               \
+	static struct power_domain power_domain_data_##inst = {                                    \
+		.devid = DT_INST_PROP(inst, tisci_device_id),                                      \
+		.mode = DT_INST_ENUM_IDX(inst, tisci_device_mode),                                 \
+	};                                                                                         \
+	PM_DEVICE_DT_INST_DEFINE(inst, tisci_pd_pm_action);                                        \
+	DEVICE_DT_INST_DEFINE(inst, tisci_pd_init, PM_DEVICE_DT_INST_GET(inst), NULL,              \
+			      &power_domain_data_##inst, PRE_KERNEL_1,                             \
+			      CONFIG_POWER_DOMAIN_TISCI_INIT_PRIORITY, NULL);
+
+DT_INST_FOREACH_STATUS_OKAY(TISCI_PD_DEVICE_DEFINE);

dts/bindings/power-domain/ti,sci-pm-domain.yaml

@@ -0,0 +1,25 @@
+# Copyright 2025 Texas Instruments Incorporated
+# SPDX-License-Identifier: Apache-2.0
+
+description: TISCI-managed power domain
+
+compatible: "ti,sci-pm-domain"
+
+include: base.yaml
+
+properties:
+  tisci,device-id:
+    type: int
+    required: true
+    description: |
+      The device ID of the power domain as defined in the TISCI documentation.
+  tisci,device-mode:
+    type: string
+    required: true
+    enum:
+      - "SHARED"
+      - "EXCLUSIVE"
+    description: |
+      The device mode of the power domain as defined in the TISCI documentation.
+  "#power-domain-cells":
+    const: 0