1 files changed, 354 insertions, 123 deletions

diff --git a/drivers/pmdomain/core.c b/drivers/pmdomain/core.c
index 18e232b5ed53..6c94137865c9 100644
--- a/drivers/pmdomain/core.c
+++ b/drivers/pmdomain/core.c
@@ -7,6 +7,7 @@
 #define pr_fmt(fmt) "PM: " fmt
 
 #include <linux/delay.h>
+#include <linux/idr.h>
 #include <linux/kernel.h>
 #include <linux/io.h>
 #include <linux/platform_device.h>
@@ -23,6 +24,9 @@
 #include <linux/cpu.h>
 #include <linux/debugfs.h>
 
+/* Provides a unique ID for each genpd device */
+static DEFINE_IDA(genpd_ida);
+
 #define GENPD_RETRY_MAX_MS	250		/* Approximate */
 
 #define GENPD_DEV_CALLBACK(genpd, type, callback, dev)		\
@@ -117,6 +121,48 @@ static const struct genpd_lock_ops genpd_spin_ops = {
 	.unlock = genpd_unlock_spin,
 };
 
+static void genpd_lock_raw_spin(struct generic_pm_domain *genpd)
+	__acquires(&genpd->raw_slock)
+{
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&genpd->raw_slock, flags);
+	genpd->raw_lock_flags = flags;
+}
+
+static void genpd_lock_nested_raw_spin(struct generic_pm_domain *genpd,
+					int depth)
+	__acquires(&genpd->raw_slock)
+{
+	unsigned long flags;
+
+	raw_spin_lock_irqsave_nested(&genpd->raw_slock, flags, depth);
+	genpd->raw_lock_flags = flags;
+}
+
+static int genpd_lock_interruptible_raw_spin(struct generic_pm_domain *genpd)
+	__acquires(&genpd->raw_slock)
+{
+	unsigned long flags;
+
+	raw_spin_lock_irqsave(&genpd->raw_slock, flags);
+	genpd->raw_lock_flags = flags;
+	return 0;
+}
+
+static void genpd_unlock_raw_spin(struct generic_pm_domain *genpd)
+	__releases(&genpd->raw_slock)
+{
+	raw_spin_unlock_irqrestore(&genpd->raw_slock, genpd->raw_lock_flags);
+}
+
+static const struct genpd_lock_ops genpd_raw_spin_ops = {
+	.lock = genpd_lock_raw_spin,
+	.lock_nested = genpd_lock_nested_raw_spin,
+	.lock_interruptible = genpd_lock_interruptible_raw_spin,
+	.unlock = genpd_unlock_raw_spin,
+};
+
 #define genpd_lock(p)			p->lock_ops->lock(p)
 #define genpd_lock_nested(p, d)		p->lock_ops->lock_nested(p, d)
 #define genpd_lock_interruptible(p)	p->lock_ops->lock_interruptible(p)
@@ -129,6 +175,7 @@ static const struct genpd_lock_ops genpd_spin_ops = {
 #define genpd_is_cpu_domain(genpd)	(genpd->flags & GENPD_FLAG_CPU_DOMAIN)
 #define genpd_is_rpm_always_on(genpd)	(genpd->flags & GENPD_FLAG_RPM_ALWAYS_ON)
 #define genpd_is_opp_table_fw(genpd)	(genpd->flags & GENPD_FLAG_OPP_TABLE_FW)
+#define genpd_is_dev_name_fw(genpd)	(genpd->flags & GENPD_FLAG_DEV_NAME_FW)
 
 static inline bool irq_safe_dev_in_sleep_domain(struct device *dev,
 		const struct generic_pm_domain *genpd)
@@ -147,7 +194,7 @@ static inline bool irq_safe_dev_in_sleep_domain(struct device *dev,
 
 	if (ret)
 		dev_warn_once(dev, "PM domain %s will not be powered off\n",
-				genpd->name);
+			      dev_name(&genpd->dev));
 
 	return ret;
 }
@@ -184,6 +231,16 @@ static struct generic_pm_domain *dev_to_genpd(struct device *dev)
 	return pd_to_genpd(dev->pm_domain);
 }
 
+struct device *dev_to_genpd_dev(struct device *dev)
+{
+	struct generic_pm_domain *genpd = dev_to_genpd(dev);
+
+	if (IS_ERR(genpd))
+		return ERR_CAST(genpd);
+
+	return &genpd->dev;
+}
+
 static int genpd_stop_dev(const struct generic_pm_domain *genpd,
 			  struct device *dev)
 {
@@ -222,7 +279,7 @@ static void genpd_debug_remove(struct generic_pm_domain *genpd)
 	if (!genpd_debugfs_dir)
 		return;
 
-	debugfs_lookup_and_remove(genpd->name, genpd_debugfs_dir);
+	debugfs_lookup_and_remove(dev_name(&genpd->dev), genpd_debugfs_dir);
 }
 
 static void genpd_update_accounting(struct generic_pm_domain *genpd)
@@ -311,72 +368,102 @@ static int genpd_xlate_performance_state(struct generic_pm_domain *genpd,
 }
 
 static int _genpd_set_performance_state(struct generic_pm_domain *genpd,
-					unsigned int state, int depth)
+					unsigned int state, int depth);
+
+static void _genpd_rollback_parent_state(struct gpd_link *link, int depth)
 {
-	struct generic_pm_domain *parent;
-	struct gpd_link *link;
-	int parent_state, ret;
+	struct generic_pm_domain *parent = link->parent;
+	int parent_state;
 
-	if (state == genpd->performance_state)
-		return 0;
+	genpd_lock_nested(parent, depth + 1);
 
-	/* Propagate to parents of genpd */
-	list_for_each_entry(link, &genpd->child_links, child_node) {
-		parent = link->parent;
+	parent_state = link->prev_performance_state;
+	link->performance_state = parent_state;
 
-		/* Find parent's performance state */
-		ret = genpd_xlate_performance_state(genpd, parent, state);
-		if (unlikely(ret < 0))
-			goto err;
+	parent_state = _genpd_reeval_performance_state(parent, parent_state);
+	if (_genpd_set_performance_state(parent, parent_state, depth + 1)) {
+		pr_err("%s: Failed to roll back to %d performance state\n",
+		       parent->name, parent_state);
+	}
 
-		parent_state = ret;
+	genpd_unlock(parent);
+}
 
-		genpd_lock_nested(parent, depth + 1);
+static int _genpd_set_parent_state(struct generic_pm_domain *genpd,
+				   struct gpd_link *link,
+				   unsigned int state, int depth)
+{
+	struct generic_pm_domain *parent = link->parent;
+	int parent_state, ret;
 
-		link->prev_performance_state = link->performance_state;
-		link->performance_state = parent_state;
-		parent_state = _genpd_reeval_performance_state(parent,
-						parent_state);
-		ret = _genpd_set_performance_state(parent, parent_state, depth + 1);
-		if (ret)
-			link->performance_state = link->prev_performance_state;
+	/* Find parent's performance state */
+	ret = genpd_xlate_performance_state(genpd, parent, state);
+	if (unlikely(ret < 0))
+		return ret;
 
-		genpd_unlock(parent);
+	parent_state = ret;
 
-		if (ret)
-			goto err;
-	}
+	genpd_lock_nested(parent, depth + 1);
 
-	if (genpd->set_performance_state) {
-		ret = genpd->set_performance_state(genpd, state);
-		if (ret)
-			goto err;
-	}
+	link->prev_performance_state = link->performance_state;
+	link->performance_state = parent_state;
 
-	genpd->performance_state = state;
-	return 0;
+	parent_state = _genpd_reeval_performance_state(parent, parent_state);
+	ret = _genpd_set_performance_state(parent, parent_state, depth + 1);
+	if (ret)
+		link->performance_state = link->prev_performance_state;
 
-err:
-	/* Encountered an error, lets rollback */
-	list_for_each_entry_continue_reverse(link, &genpd->child_links,
-					     child_node) {
-		parent = link->parent;
+	genpd_unlock(parent);
 
-		genpd_lock_nested(parent, depth + 1);
+	return ret;
+}
+
+static int _genpd_set_performance_state(struct generic_pm_domain *genpd,
+					unsigned int state, int depth)
+{
+	struct gpd_link *link = NULL;
+	int ret;
 
-		parent_state = link->prev_performance_state;
-		link->performance_state = parent_state;
+	if (state == genpd->performance_state)
+		return 0;
 
-		parent_state = _genpd_reeval_performance_state(parent,
-						parent_state);
-		if (_genpd_set_performance_state(parent, parent_state, depth + 1)) {
-			pr_err("%s: Failed to roll back to %d performance state\n",
-			       parent->name, parent_state);
+	/* When scaling up, propagate to parents first in normal order */
+	if (state > genpd->performance_state) {
+		list_for_each_entry(link, &genpd->child_links, child_node) {
+			ret = _genpd_set_parent_state(genpd, link, state, depth);
+			if (ret)
+				goto rollback_parents_up;
 		}
+	}
 
-		genpd_unlock(parent);
+	if (genpd->set_performance_state) {
+		ret = genpd->set_performance_state(genpd, state);
+		if (ret) {
+			if (link)
+				goto rollback_parents_up;
+			return ret;
+		}
+	}
+
+	/* When scaling down, propagate to parents last in reverse order */
+	if (state < genpd->performance_state) {
+		list_for_each_entry_reverse(link, &genpd->child_links, child_node) {
+			ret = _genpd_set_parent_state(genpd, link, state, depth);
+			if (ret)
+				goto rollback_parents_down;
+		}
 	}
 
+	genpd->performance_state = state;
+	return 0;
+
+rollback_parents_up:
+	list_for_each_entry_continue_reverse(link, &genpd->child_links, child_node)
+		_genpd_rollback_parent_state(link, depth);
+	return ret;
+rollback_parents_down:
+	list_for_each_entry_continue(link, &genpd->child_links, child_node)
+		_genpd_rollback_parent_state(link, depth);
 	return ret;
 }
 
@@ -548,6 +635,68 @@ void dev_pm_genpd_synced_poweroff(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(dev_pm_genpd_synced_poweroff);
 
+/**
+ * dev_pm_genpd_set_hwmode() - Set the HW mode for the device and its PM domain.
+ *
+ * @dev: Device for which the HW-mode should be changed.
+ * @enable: Value to set or unset the HW-mode.
+ *
+ * Some PM domains can rely on HW signals to control the power for a device. To
+ * allow a consumer driver to switch the behaviour for its device in runtime,
+ * which may be beneficial from a latency or energy point of view, this function
+ * may be called.
+ *
+ * It is assumed that the users guarantee that the genpd wouldn't be detached
+ * while this routine is getting called.
+ *
+ * Return: Returns 0 on success and negative error values on failures.
+ */
+int dev_pm_genpd_set_hwmode(struct device *dev, bool enable)
+{
+	struct generic_pm_domain *genpd;
+	int ret = 0;
+
+	genpd = dev_to_genpd_safe(dev);
+	if (!genpd)
+		return -ENODEV;
+
+	if (!genpd->set_hwmode_dev)
+		return -EOPNOTSUPP;
+
+	genpd_lock(genpd);
+
+	if (dev_gpd_data(dev)->hw_mode == enable)
+		goto out;
+
+	ret = genpd->set_hwmode_dev(genpd, dev, enable);
+	if (!ret)
+		dev_gpd_data(dev)->hw_mode = enable;
+
+out:
+	genpd_unlock(genpd);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(dev_pm_genpd_set_hwmode);
+
+/**
+ * dev_pm_genpd_get_hwmode() - Get the HW mode setting for the device.
+ *
+ * @dev: Device for which the current HW-mode setting should be fetched.
+ *
+ * This helper function allows consumer drivers to fetch the current HW mode
+ * setting of its the device.
+ *
+ * It is assumed that the users guarantee that the genpd wouldn't be detached
+ * while this routine is getting called.
+ *
+ * Return: Returns the HW mode setting of device from SW cached hw_mode.
+ */
+bool dev_pm_genpd_get_hwmode(struct device *dev)
+{
+	return dev_gpd_data(dev)->hw_mode;
+}
+EXPORT_SYMBOL_GPL(dev_pm_genpd_get_hwmode);
+
 static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed)
 {
 	unsigned int state_idx = genpd->state_idx;
@@ -587,7 +736,7 @@ static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed)
 	genpd->states[state_idx].power_on_latency_ns = elapsed_ns;
 	genpd->gd->max_off_time_changed = true;
 	pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
-		 genpd->name, "on", elapsed_ns);
+		 dev_name(&genpd->dev), "on", elapsed_ns);
 
 out:
 	raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL);
@@ -638,7 +787,7 @@ static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed)
 	genpd->states[state_idx].power_off_latency_ns = elapsed_ns;
 	genpd->gd->max_off_time_changed = true;
 	pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
-		 genpd->name, "off", elapsed_ns);
+		 dev_name(&genpd->dev), "off", elapsed_ns);
 
 out:
 	raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF,
@@ -1100,6 +1249,7 @@ static int __init genpd_power_off_unused(void)
 		return 0;
 	}
 
+	pr_info("genpd: Disabling unused power domains\n");
 	mutex_lock(&gpd_list_lock);
 
 	list_for_each_entry(genpd, &gpd_list, gpd_list_node)
@@ -1147,8 +1297,12 @@ static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock,
 
 	/* Choose the deepest state when suspending */
 	genpd->state_idx = genpd->state_count - 1;
-	if (_genpd_power_off(genpd, false))
+	if (_genpd_power_off(genpd, false)) {
+		genpd->states[genpd->state_idx].rejected++;
 		return;
+	} else {
+		genpd->states[genpd->state_idx].usage++;
+	}
 
 	genpd->status = GENPD_STATE_OFF;
 
@@ -1220,10 +1374,7 @@ static int genpd_prepare(struct device *dev)
 		return -EINVAL;
 
 	genpd_lock(genpd);
-
-	if (genpd->prepared_count++ == 0)
-		genpd->suspended_count = 0;
-
+	genpd->prepared_count++;
 	genpd_unlock(genpd);
 
 	ret = pm_generic_prepare(dev);
@@ -1576,6 +1727,7 @@ static void genpd_free_dev_data(struct device *dev,
 
 	spin_unlock_irq(&dev->power.lock);
 
+	dev_pm_opp_clear_config(gpd_data->opp_token);
 	kfree(gpd_data->td);
 	kfree(gpd_data);
 	dev_pm_put_subsys_data(dev);
@@ -1645,6 +1797,8 @@ static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
 
 	gpd_data->cpu = genpd_get_cpu(genpd, base_dev);
 
+	gpd_data->hw_mode = genpd->get_hwmode_dev ? genpd->get_hwmode_dev(genpd, dev) : false;
+
 	ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0;
 	if (ret)
 		goto out;
@@ -1652,7 +1806,6 @@ static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
 	genpd_lock(genpd);
 
 	genpd_set_cpumask(genpd, gpd_data->cpu);
-	dev_pm_domain_set(dev, &genpd->domain);
 
 	genpd->device_count++;
 	if (gd)
@@ -1661,6 +1814,7 @@ static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
 	list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
 
 	genpd_unlock(genpd);
+	dev_pm_domain_set(dev, &genpd->domain);
  out:
 	if (ret)
 		genpd_free_dev_data(dev, gpd_data);
@@ -1717,12 +1871,13 @@ static int genpd_remove_device(struct generic_pm_domain *genpd,
 		genpd->gd->max_off_time_changed = true;
 
 	genpd_clear_cpumask(genpd, gpd_data->cpu);
-	dev_pm_domain_set(dev, NULL);
 
 	list_del_init(&pdd->list_node);
 
 	genpd_unlock(genpd);
 
+	dev_pm_domain_set(dev, NULL);
+
 	if (genpd->detach_dev)
 		genpd->detach_dev(genpd, dev);
 
@@ -1791,7 +1946,7 @@ int dev_pm_genpd_add_notifier(struct device *dev, struct notifier_block *nb)
 
 	if (ret) {
 		dev_warn(dev, "failed to add notifier for PM domain %s\n",
-			 genpd->name);
+			 dev_name(&genpd->dev));
 		return ret;
 	}
 
@@ -1838,7 +1993,7 @@ int dev_pm_genpd_remove_notifier(struct device *dev)
 
 	if (ret) {
 		dev_warn(dev, "failed to remove notifier for PM domain %s\n",
-			 genpd->name);
+			 dev_name(&genpd->dev));
 		return ret;
 	}
 
@@ -1864,7 +2019,7 @@ static int genpd_add_subdomain(struct generic_pm_domain *genpd,
 	 */
 	if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) {
 		WARN(1, "Parent %s of subdomain %s must be IRQ safe\n",
-				genpd->name, subdomain->name);
+		     dev_name(&genpd->dev), subdomain->name);
 		return -EINVAL;
 	}
 
@@ -1939,7 +2094,7 @@ int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
 
 	if (!list_empty(&subdomain->parent_links) || subdomain->device_count) {
 		pr_warn("%s: unable to remove subdomain %s\n",
-			genpd->name, subdomain->name);
+			dev_name(&genpd->dev), subdomain->name);
 		ret = -EBUSY;
 		goto out;
 	}
@@ -1987,6 +2142,11 @@ static int genpd_set_default_power_state(struct generic_pm_domain *genpd)
 	return 0;
 }
 
+static void genpd_provider_release(struct device *dev)
+{
+	/* nothing to be done here */
+}
+
 static int genpd_alloc_data(struct generic_pm_domain *genpd)
 {
 	struct genpd_governor_data *gd = NULL;
@@ -2017,8 +2177,25 @@ static int genpd_alloc_data(struct generic_pm_domain *genpd)
 	}
 
 	genpd->gd = gd;
-	return 0;
+	device_initialize(&genpd->dev);
+	genpd->dev.release = genpd_provider_release;
 
+	if (!genpd_is_dev_name_fw(genpd)) {
+		dev_set_name(&genpd->dev, "%s", genpd->name);
+	} else {
+		ret = ida_alloc(&genpd_ida, GFP_KERNEL);
+		if (ret < 0)
+			goto put;
+
+		genpd->device_id = ret;
+		dev_set_name(&genpd->dev, "%s_%u", genpd->name, genpd->device_id);
+	}
+
+	return 0;
+put:
+	put_device(&genpd->dev);
+	if (genpd->free_states == genpd_free_default_power_state)
+		kfree(genpd->states);
 free:
 	if (genpd_is_cpu_domain(genpd))
 		free_cpumask_var(genpd->cpus);
@@ -2028,6 +2205,9 @@ free:
 
 static void genpd_free_data(struct generic_pm_domain *genpd)
 {
+	put_device(&genpd->dev);
+	if (genpd->device_id != -ENXIO)
+		ida_free(&genpd_ida, genpd->device_id);
 	if (genpd_is_cpu_domain(genpd))
 		free_cpumask_var(genpd->cpus);
 	if (genpd->free_states)
@@ -2037,7 +2217,10 @@ static void genpd_free_data(struct generic_pm_domain *genpd)
 
 static void genpd_lock_init(struct generic_pm_domain *genpd)
 {
-	if (genpd->flags & GENPD_FLAG_IRQ_SAFE) {
+	if (genpd_is_cpu_domain(genpd)) {
+		raw_spin_lock_init(&genpd->raw_slock);
+		genpd->lock_ops = &genpd_raw_spin_ops;
+	} else if (genpd_is_irq_safe(genpd)) {
 		spin_lock_init(&genpd->slock);
 		genpd->lock_ops = &genpd_spin_ops;
 	} else {
@@ -2073,6 +2256,7 @@ int pm_genpd_init(struct generic_pm_domain *genpd,
 	genpd->status = is_off ? GENPD_STATE_OFF : GENPD_STATE_ON;
 	genpd->device_count = 0;
 	genpd->provider = NULL;
+	genpd->device_id = -ENXIO;
 	genpd->has_provider = false;
 	genpd->accounting_time = ktime_get_mono_fast_ns();
 	genpd->domain.ops.runtime_suspend = genpd_runtime_suspend;
@@ -2112,9 +2296,6 @@ int pm_genpd_init(struct generic_pm_domain *genpd,
 	if (ret)
 		return ret;
 
-	device_initialize(&genpd->dev);
-	dev_set_name(&genpd->dev, "%s", genpd->name);
-
 	mutex_lock(&gpd_list_lock);
 	list_add(&genpd->gpd_list_node, &gpd_list);
 	mutex_unlock(&gpd_list_lock);
@@ -2135,13 +2316,13 @@ static int genpd_remove(struct generic_pm_domain *genpd)
 
 	if (genpd->has_provider) {
 		genpd_unlock(genpd);
-		pr_err("Provider present, unable to remove %s\n", genpd->name);
+		pr_err("Provider present, unable to remove %s\n", dev_name(&genpd->dev));
 		return -EBUSY;
 	}
 
 	if (!list_empty(&genpd->parent_links) || genpd->device_count) {
 		genpd_unlock(genpd);
-		pr_err("%s: unable to remove %s\n", __func__, genpd->name);
+		pr_err("%s: unable to remove %s\n", __func__, dev_name(&genpd->dev));
 		return -EBUSY;
 	}
 
@@ -2157,7 +2338,7 @@ static int genpd_remove(struct generic_pm_domain *genpd)
 	cancel_work_sync(&genpd->power_off_work);
 	genpd_free_data(genpd);
 
-	pr_debug("%s: removed %s\n", __func__, genpd->name);
+	pr_debug("%s: removed %s\n", __func__, dev_name(&genpd->dev));
 
 	return 0;
 }
@@ -2235,7 +2416,7 @@ static DEFINE_MUTEX(of_genpd_mutex);
  * to be a valid pointer to struct generic_pm_domain.
  */
 static struct generic_pm_domain *genpd_xlate_simple(
-					struct of_phandle_args *genpdspec,
+					const struct of_phandle_args *genpdspec,
 					void *data)
 {
 	return data;
@@ -2252,7 +2433,7 @@ static struct generic_pm_domain *genpd_xlate_simple(
  * the genpd_onecell_data struct when registering the provider.
  */
 static struct generic_pm_domain *genpd_xlate_onecell(
-					struct of_phandle_args *genpdspec,
+					const struct of_phandle_args *genpdspec,
 					void *data)
 {
 	struct genpd_onecell_data *genpd_data = data;
@@ -2495,7 +2676,7 @@ EXPORT_SYMBOL_GPL(of_genpd_del_provider);
  * on failure.
  */
 static struct generic_pm_domain *genpd_get_from_provider(
-					struct of_phandle_args *genpdspec)
+					const struct of_phandle_args *genpdspec)
 {
 	struct generic_pm_domain *genpd = ERR_PTR(-ENOENT);
 	struct of_genpd_provider *provider;
@@ -2526,7 +2707,7 @@ static struct generic_pm_domain *genpd_get_from_provider(
  * Looks-up an I/O PM domain based upon phandle args provided and adds
  * the device to the PM domain. Returns a negative error code on failure.
  */
-int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev)
+int of_genpd_add_device(const struct of_phandle_args *genpdspec, struct device *dev)
 {
 	struct generic_pm_domain *genpd;
 	int ret;
@@ -2560,8 +2741,8 @@ EXPORT_SYMBOL_GPL(of_genpd_add_device);
  * provided and adds the subdomain to the parent PM domain. Returns a
  * negative error code on failure.
  */
-int of_genpd_add_subdomain(struct of_phandle_args *parent_spec,
-			   struct of_phandle_args *subdomain_spec)
+int of_genpd_add_subdomain(const struct of_phandle_args *parent_spec,
+			   const struct of_phandle_args *subdomain_spec)
 {
 	struct generic_pm_domain *parent, *subdomain;
 	int ret;
@@ -2598,8 +2779,8 @@ EXPORT_SYMBOL_GPL(of_genpd_add_subdomain);
  * provided and removes the subdomain from the parent PM domain. Returns a
  * negative error code on failure.
  */
-int of_genpd_remove_subdomain(struct of_phandle_args *parent_spec,
-			      struct of_phandle_args *subdomain_spec)
+int of_genpd_remove_subdomain(const struct of_phandle_args *parent_spec,
+			      const struct of_phandle_args *subdomain_spec)
 {
 	struct generic_pm_domain *parent, *subdomain;
 	int ret;
@@ -2732,12 +2913,58 @@ static void genpd_dev_pm_sync(struct device *dev)
 	genpd_queue_power_off_work(pd);
 }
 
+static int genpd_set_required_opp_dev(struct device *dev,
+				      struct device *base_dev)
+{
+	struct dev_pm_opp_config config = {
+		.required_dev = dev,
+	};
+	int ret;
+
+	/* Limit support to non-providers for now. */
+	if (of_property_present(base_dev->of_node, "#power-domain-cells"))
+		return 0;
+
+	if (!dev_pm_opp_of_has_required_opp(base_dev))
+		return 0;
+
+	ret = dev_pm_opp_set_config(base_dev, &config);
+	if (ret < 0)
+		return ret;
+
+	dev_gpd_data(dev)->opp_token = ret;
+	return 0;
+}
+
+static int genpd_set_required_opp(struct device *dev, unsigned int index)
+{
+	int ret, pstate;
+
+	/* Set the default performance state */
+	pstate = of_get_required_opp_performance_state(dev->of_node, index);
+	if (pstate < 0 && pstate != -ENODEV && pstate != -EOPNOTSUPP) {
+		ret = pstate;
+		goto err;
+	} else if (pstate > 0) {
+		ret = dev_pm_genpd_set_performance_state(dev, pstate);
+		if (ret)
+			goto err;
+		dev_gpd_data(dev)->default_pstate = pstate;
+	}
+
+	return 0;
+err:
+	dev_err(dev, "failed to set required performance state for power-domain %s: %d\n",
+		dev_to_genpd(dev)->name, ret);
+	return ret;
+}
+
 static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev,
-				 unsigned int index, bool power_on)
+				 unsigned int index, unsigned int num_domains,
+				 bool power_on)
 {
 	struct of_phandle_args pd_args;
 	struct generic_pm_domain *pd;
-	int pstate;
 	int ret;
 
 	ret = of_parse_phandle_with_args(dev->of_node, "power-domains",
@@ -2766,18 +2993,21 @@ static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev,
 	dev->pm_domain->detach = genpd_dev_pm_detach;
 	dev->pm_domain->sync = genpd_dev_pm_sync;
 
-	/* Set the default performance state */
-	pstate = of_get_required_opp_performance_state(dev->of_node, index);
-	if (pstate < 0 && pstate != -ENODEV && pstate != -EOPNOTSUPP) {
-		ret = pstate;
-		goto err;
-	} else if (pstate > 0) {
-		ret = dev_pm_genpd_set_performance_state(dev, pstate);
+	/*
+	 * For a single PM domain the index of the required OPP must be zero, so
+	 * let's try to assign a required dev in that case. In the multiple PM
+	 * domains case, we need platform code to specify the index.
+	 */
+	if (num_domains == 1) {
+		ret = genpd_set_required_opp_dev(dev, base_dev);
 		if (ret)
 			goto err;
-		dev_gpd_data(dev)->default_pstate = pstate;
 	}
 
+	ret = genpd_set_required_opp(dev, index);
+	if (ret)
+		goto err;
+
 	if (power_on) {
 		genpd_lock(pd);
 		ret = genpd_power_on(pd, 0);
@@ -2798,8 +3028,6 @@ static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev,
 	return 1;
 
 err:
-	dev_err(dev, "failed to set required performance state for power-domain %s: %d\n",
-		pd->name, ret);
 	genpd_remove_device(pd, dev);
 	return ret;
 }
@@ -2830,7 +3058,7 @@ int genpd_dev_pm_attach(struct device *dev)
 				       "#power-domain-cells") != 1)
 		return 0;
 
-	return __genpd_dev_pm_attach(dev, dev, 0, true);
+	return __genpd_dev_pm_attach(dev, dev, 0, 1, true);
 }
 EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
 
@@ -2883,7 +3111,7 @@ struct device *genpd_dev_pm_attach_by_id(struct device *dev,
 	}
 
 	/* Try to attach the device to the PM domain at the specified index. */
-	ret = __genpd_dev_pm_attach(virt_dev, dev, index, false);
+	ret = __genpd_dev_pm_attach(virt_dev, dev, index, num_domains, false);
 	if (ret < 1) {
 		device_unregister(virt_dev);
 		return ret ? ERR_PTR(ret) : NULL;
@@ -2952,6 +3180,8 @@ static int genpd_parse_state(struct genpd_power_state *genpd_state,
 	if (!err)
 		genpd_state->residency_ns = 1000LL * residency;
 
+	of_property_read_string(state_node, "idle-state-name", &genpd_state->name);
+
 	genpd_state->power_on_latency_ns = 1000LL * exit_latency;
 	genpd_state->power_off_latency_ns = 1000LL * entry_latency;
 	genpd_state->fwnode = &state_node->fwnode;
@@ -3075,7 +3305,7 @@ static void rtpm_status_str(struct seq_file *s, struct device *dev)
 	else
 		WARN_ON(1);
 
-	seq_printf(s, "%-25s  ", p);
+	seq_printf(s, "%-26s  ", p);
 }
 
 static void perf_status_str(struct seq_file *s, struct device *dev)
@@ -3083,7 +3313,17 @@ static void perf_status_str(struct seq_file *s, struct device *dev)
 	struct generic_pm_domain_data *gpd_data;
 
 	gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
-	seq_put_decimal_ull(s, "", gpd_data->performance_state);
+
+	seq_printf(s, "%-10u  ", gpd_data->performance_state);
+}
+
+static void mode_status_str(struct seq_file *s, struct device *dev)
+{
+	struct generic_pm_domain_data *gpd_data;
+
+	gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
+
+	seq_printf(s, "%2s", gpd_data->hw_mode ? "HW" : "SW");
 }
 
 static int genpd_summary_one(struct seq_file *s,
@@ -3094,7 +3334,6 @@ static int genpd_summary_one(struct seq_file *s,
 		[GENPD_STATE_OFF] = "off"
 	};
 	struct pm_domain_data *pm_data;
-	const char *kobj_path;
 	struct gpd_link *link;
 	char state[16];
 	int ret;
@@ -3111,12 +3350,12 @@ static int genpd_summary_one(struct seq_file *s,
 	else
 		snprintf(state, sizeof(state), "%s",
 			 status_lookup[genpd->status]);
-	seq_printf(s, "%-30s  %-50s %u", genpd->name, state, genpd->performance_state);
+	seq_printf(s, "%-30s  %-30s  %u", dev_name(&genpd->dev), state, genpd->performance_state);
 
 	/*
 	 * Modifications on the list require holding locks on both
 	 * parent and child, so we are safe.
-	 * Also genpd->name is immutable.
+	 * Also the device name is immutable.
 	 */
 	list_for_each_entry(link, &genpd->parent_links, parent_node) {
 		if (list_is_first(&link->parent_node, &genpd->parent_links))
@@ -3127,16 +3366,10 @@ static int genpd_summary_one(struct seq_file *s,
 	}
 
 	list_for_each_entry(pm_data, &genpd->dev_list, list_node) {
-		kobj_path = kobject_get_path(&pm_data->dev->kobj,
-				genpd_is_irq_safe(genpd) ?
-				GFP_ATOMIC : GFP_KERNEL);
-		if (kobj_path == NULL)
-			continue;
-
-		seq_printf(s, "\n    %-50s  ", kobj_path);
+		seq_printf(s, "\n    %-30s  ", dev_name(pm_data->dev));
 		rtpm_status_str(s, pm_data->dev);
 		perf_status_str(s, pm_data->dev);
-		kfree(kobj_path);
+		mode_status_str(s, pm_data->dev);
 	}
 
 	seq_puts(s, "\n");
@@ -3151,9 +3384,9 @@ static int summary_show(struct seq_file *s, void *data)
 	struct generic_pm_domain *genpd;
 	int ret = 0;
 
-	seq_puts(s, "domain                          status          children                           performance\n");
-	seq_puts(s, "    /device                                             runtime status\n");
-	seq_puts(s, "----------------------------------------------------------------------------------------------\n");
+	seq_puts(s, "domain                          status          children        performance\n");
+	seq_puts(s, "    /device                         runtime status                  managed by\n");
+	seq_puts(s, "------------------------------------------------------------------------------\n");
 
 	ret = mutex_lock_interruptible(&gpd_list_lock);
 	if (ret)
@@ -3227,7 +3460,10 @@ static int idle_states_show(struct seq_file *s, void *data)
 	seq_puts(s, "State          Time Spent(ms) Usage          Rejected\n");
 
 	for (i = 0; i < genpd->state_count; i++) {
-		idle_time += genpd->states[i].idle_time;
+		struct genpd_power_state *state = &genpd->states[i];
+		char state_name[15];
+
+		idle_time += state->idle_time;
 
 		if (genpd->status == GENPD_STATE_OFF && genpd->state_idx == i) {
 			now = ktime_get_mono_fast_ns();
@@ -3237,9 +3473,13 @@ static int idle_states_show(struct seq_file *s, void *data)
 			}
 		}
 
+		if (!state->name)
+			snprintf(state_name, ARRAY_SIZE(state_name), "S%-13d", i);
+
 		do_div(idle_time, NSEC_PER_MSEC);
-		seq_printf(s, "S%-13i %-14llu %-14llu %llu\n", i, idle_time,
-			   genpd->states[i].usage, genpd->states[i].rejected);
+		seq_printf(s, "%-14s %-14llu %-14llu %llu\n",
+			   state->name ?: state_name, idle_time,
+			   state->usage, state->rejected);
 	}
 
 	genpd_unlock(genpd);
@@ -3305,23 +3545,14 @@ static int devices_show(struct seq_file *s, void *data)
 {
 	struct generic_pm_domain *genpd = s->private;
 	struct pm_domain_data *pm_data;
-	const char *kobj_path;
 	int ret = 0;
 
 	ret = genpd_lock_interruptible(genpd);
 	if (ret)
 		return -ERESTARTSYS;
 
-	list_for_each_entry(pm_data, &genpd->dev_list, list_node) {
-		kobj_path = kobject_get_path(&pm_data->dev->kobj,
-				genpd_is_irq_safe(genpd) ?
-				GFP_ATOMIC : GFP_KERNEL);
-		if (kobj_path == NULL)
-			continue;
-
-		seq_printf(s, "%s\n", kobj_path);
-		kfree(kobj_path);
-	}
+	list_for_each_entry(pm_data, &genpd->dev_list, list_node)
+		seq_printf(s, "%s\n", dev_name(pm_data->dev));
 
 	genpd_unlock(genpd);
 	return ret;
@@ -3356,7 +3587,7 @@ static void genpd_debug_add(struct generic_pm_domain *genpd)
 	if (!genpd_debugfs_dir)
 		return;
 
-	d = debugfs_create_dir(genpd->name, genpd_debugfs_dir);
+	d = debugfs_create_dir(dev_name(&genpd->dev), genpd_debugfs_dir);
 
 	debugfs_create_file("current_state", 0444,
 			    d, genpd, &status_fops);