MLK-10238-1: Revert "base: power: Add generic OF-based power domain look-up"

This reverts commit 4aa055cb0634bc8d0389070104fe6aa7cfa99b8c.
Signed-off-by: Robin Gong <b38343@freescale.com>

(cherry picked from commit e599f64de890a60a3b9884dd5838c43472f145e2)

4 files changed, 0 insertions, 384 deletions

diff --git a/Documentation/devicetree/bindings/power/power_domain.txt b/Documentation/devicetree/bindings/power/power_domain.txt
deleted file mode 100644
index 303d0a968569..000000000000
--- a/Documentation/devicetree/bindings/power/power_domain.txt
+++ /dev/null
@@ -1,51 +0,0 @@
-* Generic power domains
-
-System on chip designs are often divided into multiple power domains that
-can be used for power gating of selected IP blocks for power saving by
-reduced leakage current.
-
-This device tree binding can be used to bind power domain consumer devices
-with their power domains provided by power domain providers. A power domain
-provider can be represented by any node in the device tree and can provide
-one or more power domains. A consumer node can refer to the provider by
-a phandle and a set of phandle arguments (so called power domain specifier)
-of length specified by #power-domain-cells property in the power domain
-provider node.
-
-==Power domain providers==
-
-Required properties:
- - #power-domain-cells : Number of cells in a power domain specifier;
-   Typically 0 for nodes representing a single power domain and 1 for nodes
-   providing multiple power domains (e.g. power controllers), but can be
-   any value as specified by device tree binding documentation of particular
-   provider.
-
-Example:
-
-	power: power-controller@12340000 {
-		compatible = "foo,power-controller";
-		reg = <0x12340000 0x1000>;
-		#power-domain-cells = <1>;
-	};
-
-The node above defines a power controller that is a power domain provider
-and expects one cell as its phandle argument.
-
-==Power domain consumers==
-
-Required properties:
- - power-domains : A phandle and power domain specifier as defined by bindings
-                   of power controller specified by phandle.
-
-Example:
-
-	leaky-device@12350000 {
-		compatible = "foo,i-leak-current";
-		reg = <0x12350000 0x1000>;
-		power-domains = <&power 0>;
-	};
-
-The node above defines a typical power domain consumer device, which is located
-inside power domain with index 0 of power controller represented by node with
-label "power".
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index c843a20c40e3..dc127e5dec4b 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -9,7 +9,6 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/io.h>
-#include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/pm_domain.h>
 #include <linux/pm_qos.h>
@@ -2178,285 +2177,3 @@ void pm_genpd_init(struct generic_pm_domain *genpd,
 	list_add(&genpd->gpd_list_node, &gpd_list);
 	mutex_unlock(&gpd_list_lock);
 }
-
-#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
-/*
- * Device Tree based power domain providers.
- *
- * The code below implements generic device tree based power domain providers
- * that bind device tree nodes with generic power domains registered in the
- * system.
- *
- * Any driver that registers generic power domains and need to support binding
- * of devices to these domains is supposed to register a power domain provider,
- * which maps a power domain specifier retrieved from device tree to a power
- * domain.
- *
- * Two simple mapping functions have been provided for convenience:
- *  - of_genpd_xlate_simple() for 1:1 device tree node to domain mapping,
- *  - of_genpd_xlate_onecell() for mapping of multiple domains per node
- *    by index.
- */
-
-/**
- * struct of_genpd_provider - Power domain provider registration structure
- * @link: Entry in global list of domain providers
- * @node: Pointer to device tree node of domain provider
- * @xlate: Provider-specific xlate callback mapping a set of specifier cells
- *         into a power domain.
- * @data: context pointer to be passed into @xlate callback
- */
-struct of_genpd_provider {
-	struct list_head link;
-
-	struct device_node *node;
-	genpd_xlate_t xlate;
-	void *data;
-};
-
-/* List of registered power domain providers. */
-static LIST_HEAD(of_genpd_providers);
-/* Mutex to protect the list above. */
-static DEFINE_MUTEX(of_genpd_mutex);
-
-/**
- * of_genpd_xlate_simple() - Xlate function for direct node-domain mapping
- * @genpdspec: OF phandle args to map into a power domain
- * @data: xlate function private data - pointer to struct generic_pm_domain
- *
- * This is a generic xlate function that can be used to model power domains
- * that have their own device tree nodes. The private data of xlate function
- * needs to be a valid pointer to struct generic_pm_domain.
- */
-struct generic_pm_domain *of_genpd_xlate_simple(
-					struct of_phandle_args *genpdspec,
-					void *data)
-{
-	if (genpdspec->args_count != 0)
-		return ERR_PTR(-EINVAL);
-	return data;
-}
-EXPORT_SYMBOL_GPL(of_genpd_xlate_simple);
-
-/**
- * of_genpd_xlate_onecell() - Xlate function for providers using single index.
- * @genpdspec: OF phandle args to map into a power domain
- * @data: xlate function private data - pointer to struct genpd_onecell_data
- *
- * This is a generic xlate function that can be used to model simple power
- * domain controllers that have one device tree node and provide multiple
- * power domains. A single cell is used as an index to an array of power
- * domains specified in genpd_onecell_data struct when registering the
- * provider.
- */
-struct generic_pm_domain *of_genpd_xlate_onecell(
-					struct of_phandle_args *genpdspec,
-					void *data)
-{
-	struct genpd_onecell_data *genpd_data = data;
-	unsigned int idx = genpdspec->args[0];
-
-	if (genpdspec->args_count != 1)
-		return ERR_PTR(-EINVAL);
-
-	if (idx >= genpd_data->domain_num) {
-		pr_err("%s: invalid domain index %d\n", __func__, idx);
-		return ERR_PTR(-EINVAL);
-	}
-
-	return genpd_data->domains[idx];
-}
-EXPORT_SYMBOL_GPL(of_genpd_xlate_onecell);
-
-/**
- * of_genpd_add_provider() - Register a domain provider for a node
- * @np: Device node pointer associated with domain provider.
- * @xlate: Callback for decoding domain from phandle arguments.
- * @data: Context pointer for @genpd_src_get callback.
- */
-int of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
-			  void *data)
-{
-	struct of_genpd_provider *cp;
-
-	cp = kzalloc(sizeof(*cp), GFP_KERNEL);
-	if (!cp)
-		return -ENOMEM;
-
-	cp->node = of_node_get(np);
-	cp->data = data;
-	cp->xlate = xlate;
-
-	mutex_lock(&of_genpd_mutex);
-	list_add(&cp->link, &of_genpd_providers);
-	mutex_unlock(&of_genpd_mutex);
-	pr_debug("Added domain provider from %s\n", np->full_name);
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(of_genpd_add_provider);
-
-/**
- * of_genpd_del_provider() - Remove a previously registered domain provider
- * @np: Device node pointer associated with domain provider
- */
-void of_genpd_del_provider(struct device_node *np)
-{
-	struct of_genpd_provider *cp;
-
-	mutex_lock(&of_genpd_mutex);
-	list_for_each_entry(cp, &of_genpd_providers, link) {
-		if (cp->node == np) {
-			list_del(&cp->link);
-			of_node_put(cp->node);
-			kfree(cp);
-			break;
-		}
-	}
-	mutex_unlock(&of_genpd_mutex);
-}
-EXPORT_SYMBOL_GPL(of_genpd_del_provider);
-
-/**
- * of_genpd_get_from_provider() - Look-up power domain
- * @genpdspec: OF phandle args to use for look-up
- *
- * Looks for domain provider under node specified by @genpdspec and if found
- * uses xlate function of the provider to map phandle args to a power domain.
- *
- * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR()
- * on failure.
- */
-static struct generic_pm_domain *of_genpd_get_from_provider(
-					struct of_phandle_args *genpdspec)
-{
-	struct generic_pm_domain *genpd = ERR_PTR(-EPROBE_DEFER);
-	struct of_genpd_provider *provider;
-
-	mutex_lock(&of_genpd_mutex);
-
-	/* Check if we have such a provider in our array */
-	list_for_each_entry(provider, &of_genpd_providers, link) {
-		if (provider->node == genpdspec->np)
-			genpd = provider->xlate(genpdspec, provider->data);
-		if (!IS_ERR(genpd))
-			break;
-	}
-
-	mutex_unlock(&of_genpd_mutex);
-
-	return genpd;
-}
-
-/*
- * Device<->domain binding using Device Tree look-up.
- *
- * The purpose of code below is to manage assignment of devices to their
- * power domains in an automatic fashion, based on data read from device tree.
- * The two functions, genpd_bind_domain() and genpd_unbind_domain() are
- * intended to be called by higher level code that manages devices, i.e.
- * really_probe() and __device_release_driver() to respectively bind and
- * unbind device from its power domain.
- *
- * Both generic and legacy Samsung-specific DT bindings are supported to
- * keep backwards compatibility with existing DTBs.
- */
-
-/**
- * genpd_bind_domain - Bind device to its power domain using Device Tree.
- * @dev: Device to bind to its power domain.
- *
- * Tries to parse power domain specifier from device's OF node and if succeeds
- * attaches the device to retrieved power domain.
- *
- * Returns 0 on success or negative error code otherwise.
- */
-int genpd_bind_domain(struct device *dev)
-{
-	struct of_phandle_args pd_args;
-	struct generic_pm_domain *pd;
-	int ret;
-
-	if (!dev->of_node)
-		return 0;
-
-	ret = of_parse_phandle_with_args(dev->of_node, "power-domains",
-					"#power-domain-cells", 0, &pd_args);
-	if (ret < 0) {
-		if (ret != -ENOENT)
-			return ret;
-
-		/*
-		 * Try legacy Samsung-specific bindings
-		 * (for backwards compatibility of DT ABI)
-		 */
-		pd_args.args_count = 0;
-		pd_args.np = of_parse_phandle(dev->of_node,
-						"samsung,power-domain", 0);
-		if (!pd_args.np)
-			return 0;
-	}
-
-	pd = of_genpd_get_from_provider(&pd_args);
-	if (IS_ERR(pd)) {
-		if (PTR_ERR(pd) != -EPROBE_DEFER)
-			dev_err(dev, "failed to find power domain: %ld\n",
-				PTR_ERR(pd));
-		return PTR_ERR(pd);
-	}
-
-	dev_dbg(dev, "adding to power domain %s\n", pd->name);
-
-	while (1) {
-		ret = pm_genpd_add_device(pd, dev);
-		if (ret != -EAGAIN)
-			break;
-		cond_resched();
-	}
-
-	if (ret < 0) {
-		dev_err(dev, "failed to add to power domain %s: %d",
-			pd->name, ret);
-		return ret;
-	}
-
-	return 0;
-}
-
-/**
- * genpd_unbind_domain - Unbind device from its power domain.
- * @dev: Device to unbind from its power domain.
- *
- * Unbinds device from power domain previously bound to it.
- *
- * Returns 0 on success or negative error code otherwise.
- */
-int genpd_unbind_domain(struct device *dev)
-{
-	struct generic_pm_domain *pd = dev_to_genpd(dev);
-	int ret;
-
-	if (!dev->of_node || IS_ERR(pd))
-		return 0;
-
-	dev_dbg(dev, "removing from power domain %s\n", pd->name);
-
-	while (1) {
-		ret = pm_genpd_remove_device(pd, dev);
-		if (ret != -EAGAIN)
-			break;
-		cond_resched();
-	}
-
-	if (ret < 0) {
-		dev_err(dev, "failed to remove from power domain %s: %d",
-			pd->name, ret);
-		return ret;
-	}
-
-	/* Check if domain can be powered off after removing this device. */
-	genpd_queue_power_off_work(pd);
-
-	return 0;
-}
-#endif
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 04473d4e0aa3..7c1d252b20c0 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -310,50 +310,4 @@ static inline void pm_genpd_syscore_poweron(struct device *dev)
 	pm_genpd_syscore_switch(dev, false);
 }
 
-/* OF power domain providers */
-struct of_device_id;
-
-struct genpd_onecell_data {
-	struct generic_pm_domain **domains;
-	unsigned int domain_num;
-};
-
-typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args,
-						   void *data);
-
-#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
-int of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
-			  void *data);
-void of_genpd_del_provider(struct device_node *np);
-
-struct generic_pm_domain *of_genpd_xlate_simple(
-					struct of_phandle_args *genpdspec,
-					void *data);
-struct generic_pm_domain *of_genpd_xlate_onecell(
-					struct of_phandle_args *genpdspec,
-					void *data);
-
-int genpd_bind_domain(struct device *dev);
-int genpd_unbind_domain(struct device *dev);
-#else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
-static inline int of_genpd_add_provider(struct device_node *np,
-					genpd_xlate_t xlate, void *data)
-{
-	return 0;
-}
-static inline void of_genpd_del_provider(struct device_node *np) {}
-
-#define of_genpd_xlate_simple		NULL
-#define of_genpd_xlate_onecell		NULL
-
-static inline int genpd_bind_domain(struct device *dev)
-{
-	return 0;
-}
-static inline int genpd_unbind_domain(struct device *dev)
-{
-	return 0;
-}
-#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
-
 #endif /* _LINUX_PM_DOMAIN_H */
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 45aa98ee5a70..2fac9cc79b3d 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -306,10 +306,6 @@ config PM_GENERIC_DOMAINS_RUNTIME
 	def_bool y
 	depends on PM_RUNTIME && PM_GENERIC_DOMAINS
 
-config PM_GENERIC_DOMAINS_OF
-	def_bool y
-	depends on PM_GENERIC_DOMAINS && OF && !ARCH_EXYNOS
-
 config CPU_PM
 	bool
 	depends on SUSPEND || CPU_IDLE