Merge back new material for v4.7.

1 files changed, 21 insertions, 419 deletions

diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c
index d8f4cc22856c..7c04c87738a6 100644
--- a/drivers/base/power/opp/core.c
+++ b/drivers/base/power/opp/core.c
@@ -18,7 +18,6 @@
 #include <linux/err.h>
 #include <linux/slab.h>
 #include <linux/device.h>
-#include <linux/of.h>
 #include <linux/export.h>
 #include <linux/regulator/consumer.h>
 
@@ -29,7 +28,7 @@
  * from here, with each opp_table containing the list of opps it supports in
  * various states of availability.
  */
-static LIST_HEAD(opp_tables);
+LIST_HEAD(opp_tables);
 /* Lock to allow exclusive modification to the device and opp lists */
 DEFINE_MUTEX(opp_table_lock);
 
@@ -53,26 +52,6 @@ static struct opp_device *_find_opp_dev(const struct device *dev,
 	return NULL;
 }
 
-static struct opp_table *_managed_opp(const struct device_node *np)
-{
-	struct opp_table *opp_table;
-
-	list_for_each_entry_rcu(opp_table, &opp_tables, node) {
-		if (opp_table->np == np) {
-			/*
-			 * Multiple devices can point to the same OPP table and
-			 * so will have same node-pointer, np.
-			 *
-			 * But the OPPs will be considered as shared only if the
-			 * OPP table contains a "opp-shared" property.
-			 */
-			return opp_table->shared_opp ? opp_table : NULL;
-		}
-	}
-
-	return NULL;
-}
-
 /**
  * _find_opp_table() - find opp_table struct using device pointer
  * @dev:	device pointer used to lookup OPP table
@@ -757,7 +736,6 @@ static struct opp_table *_add_opp_table(struct device *dev)
 {
 	struct opp_table *opp_table;
 	struct opp_device *opp_dev;
-	struct device_node *np;
 	int ret;
 
 	/* Check for existing table for 'dev' first */
@@ -781,20 +759,7 @@ static struct opp_table *_add_opp_table(struct device *dev)
 		return NULL;
 	}
 
-	/*
-	 * Only required for backward compatibility with v1 bindings, but isn't
-	 * harmful for other cases. And so we do it unconditionally.
-	 */
-	np = of_node_get(dev->of_node);
-	if (np) {
-		u32 val;
-
-		if (!of_property_read_u32(np, "clock-latency", &val))
-			opp_table->clock_latency_ns_max = val;
-		of_property_read_u32(np, "voltage-tolerance",
-				     &opp_table->voltage_tolerance_v1);
-		of_node_put(np);
-	}
+	_of_init_opp_table(opp_table, dev);
 
 	/* Set regulator to a non-NULL error value */
 	opp_table->regulator = ERR_PTR(-ENXIO);
@@ -890,8 +855,8 @@ static void _kfree_opp_rcu(struct rcu_head *head)
  * It is assumed that the caller holds required mutex for an RCU updater
  * strategy.
  */
-static void _opp_remove(struct opp_table *opp_table,
-			struct dev_pm_opp *opp, bool notify)
+void _opp_remove(struct opp_table *opp_table, struct dev_pm_opp *opp,
+		 bool notify)
 {
 	/*
 	 * Notify the changes in the availability of the operable
@@ -952,8 +917,8 @@ unlock:
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_remove);
 
-static struct dev_pm_opp *_allocate_opp(struct device *dev,
-					struct opp_table **opp_table)
+struct dev_pm_opp *_allocate_opp(struct device *dev,
+				 struct opp_table **opp_table)
 {
 	struct dev_pm_opp *opp;
 
@@ -989,8 +954,8 @@ static bool _opp_supported_by_regulators(struct dev_pm_opp *opp,
 	return true;
 }
 
-static int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
-		    struct opp_table *opp_table)
+int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
+	     struct opp_table *opp_table)
 {
 	struct dev_pm_opp *opp;
 	struct list_head *head = &opp_table->opp_list;
@@ -1066,8 +1031,8 @@ static int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
  *		Duplicate OPPs (both freq and volt are same) and !opp->available
  * -ENOMEM	Memory allocation failure
  */
-static int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt,
-		       bool dynamic)
+int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt,
+		bool dynamic)
 {
 	struct opp_table *opp_table;
 	struct dev_pm_opp *new_opp;
@@ -1112,83 +1077,6 @@ unlock:
 	return ret;
 }
 
-/* TODO: Support multiple regulators */
-static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev,
-			      struct opp_table *opp_table)
-{
-	u32 microvolt[3] = {0};
-	u32 val;
-	int count, ret;
-	struct property *prop = NULL;
-	char name[NAME_MAX];
-
-	/* Search for "opp-microvolt-<name>" */
-	if (opp_table->prop_name) {
-		snprintf(name, sizeof(name), "opp-microvolt-%s",
-			 opp_table->prop_name);
-		prop = of_find_property(opp->np, name, NULL);
-	}
-
-	if (!prop) {
-		/* Search for "opp-microvolt" */
-		sprintf(name, "opp-microvolt");
-		prop = of_find_property(opp->np, name, NULL);
-
-		/* Missing property isn't a problem, but an invalid entry is */
-		if (!prop)
-			return 0;
-	}
-
-	count = of_property_count_u32_elems(opp->np, name);
-	if (count < 0) {
-		dev_err(dev, "%s: Invalid %s property (%d)\n",
-			__func__, name, count);
-		return count;
-	}
-
-	/* There can be one or three elements here */
-	if (count != 1 && count != 3) {
-		dev_err(dev, "%s: Invalid number of elements in %s property (%d)\n",
-			__func__, name, count);
-		return -EINVAL;
-	}
-
-	ret = of_property_read_u32_array(opp->np, name, microvolt, count);
-	if (ret) {
-		dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret);
-		return -EINVAL;
-	}
-
-	opp->u_volt = microvolt[0];
-
-	if (count == 1) {
-		opp->u_volt_min = opp->u_volt;
-		opp->u_volt_max = opp->u_volt;
-	} else {
-		opp->u_volt_min = microvolt[1];
-		opp->u_volt_max = microvolt[2];
-	}
-
-	/* Search for "opp-microamp-<name>" */
-	prop = NULL;
-	if (opp_table->prop_name) {
-		snprintf(name, sizeof(name), "opp-microamp-%s",
-			 opp_table->prop_name);
-		prop = of_find_property(opp->np, name, NULL);
-	}
-
-	if (!prop) {
-		/* Search for "opp-microamp" */
-		sprintf(name, "opp-microamp");
-		prop = of_find_property(opp->np, name, NULL);
-	}
-
-	if (prop && !of_property_read_u32(opp->np, name, &val))
-		opp->u_amp = val;
-
-	return 0;
-}
-
 /**
  * dev_pm_opp_set_supported_hw() - Set supported platforms
  * @dev: Device for which supported-hw has to be set.
@@ -1517,144 +1405,6 @@ unlock:
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulator);
 
-static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table,
-			      struct device_node *np)
-{
-	unsigned int count = opp_table->supported_hw_count;
-	u32 version;
-	int ret;
-
-	if (!opp_table->supported_hw)
-		return true;
-
-	while (count--) {
-		ret = of_property_read_u32_index(np, "opp-supported-hw", count,
-						 &version);
-		if (ret) {
-			dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n",
-				 __func__, count, ret);
-			return false;
-		}
-
-		/* Both of these are bitwise masks of the versions */
-		if (!(version & opp_table->supported_hw[count]))
-			return false;
-	}
-
-	return true;
-}
-
-/**
- * _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings)
- * @dev:	device for which we do this operation
- * @np:		device node
- *
- * This function adds an opp definition to the opp table and returns status. The
- * opp can be controlled using dev_pm_opp_enable/disable functions and may be
- * removed by dev_pm_opp_remove.
- *
- * Locking: The internal opp_table and opp structures are RCU protected.
- * Hence this function internally uses RCU updater strategy with mutex locks
- * to keep the integrity of the internal data structures. Callers should ensure
- * that this function is *NOT* called under RCU protection or in contexts where
- * mutex cannot be locked.
- *
- * Return:
- * 0		On success OR
- *		Duplicate OPPs (both freq and volt are same) and opp->available
- * -EEXIST	Freq are same and volt are different OR
- *		Duplicate OPPs (both freq and volt are same) and !opp->available
- * -ENOMEM	Memory allocation failure
- * -EINVAL	Failed parsing the OPP node
- */
-static int _opp_add_static_v2(struct device *dev, struct device_node *np)
-{
-	struct opp_table *opp_table;
-	struct dev_pm_opp *new_opp;
-	u64 rate;
-	u32 val;
-	int ret;
-
-	/* Hold our table modification lock here */
-	mutex_lock(&opp_table_lock);
-
-	new_opp = _allocate_opp(dev, &opp_table);
-	if (!new_opp) {
-		ret = -ENOMEM;
-		goto unlock;
-	}
-
-	ret = of_property_read_u64(np, "opp-hz", &rate);
-	if (ret < 0) {
-		dev_err(dev, "%s: opp-hz not found\n", __func__);
-		goto free_opp;
-	}
-
-	/* Check if the OPP supports hardware's hierarchy of versions or not */
-	if (!_opp_is_supported(dev, opp_table, np)) {
-		dev_dbg(dev, "OPP not supported by hardware: %llu\n", rate);
-		goto free_opp;
-	}
-
-	/*
-	 * Rate is defined as an unsigned long in clk API, and so casting
-	 * explicitly to its type. Must be fixed once rate is 64 bit
-	 * guaranteed in clk API.
-	 */
-	new_opp->rate = (unsigned long)rate;
-	new_opp->turbo = of_property_read_bool(np, "turbo-mode");
-
-	new_opp->np = np;
-	new_opp->dynamic = false;
-	new_opp->available = true;
-
-	if (!of_property_read_u32(np, "clock-latency-ns", &val))
-		new_opp->clock_latency_ns = val;
-
-	ret = opp_parse_supplies(new_opp, dev, opp_table);
-	if (ret)
-		goto free_opp;
-
-	ret = _opp_add(dev, new_opp, opp_table);
-	if (ret)
-		goto free_opp;
-
-	/* OPP to select on device suspend */
-	if (of_property_read_bool(np, "opp-suspend")) {
-		if (opp_table->suspend_opp) {
-			dev_warn(dev, "%s: Multiple suspend OPPs found (%lu %lu)\n",
-				 __func__, opp_table->suspend_opp->rate,
-				 new_opp->rate);
-		} else {
-			new_opp->suspend = true;
-			opp_table->suspend_opp = new_opp;
-		}
-	}
-
-	if (new_opp->clock_latency_ns > opp_table->clock_latency_ns_max)
-		opp_table->clock_latency_ns_max = new_opp->clock_latency_ns;
-
-	mutex_unlock(&opp_table_lock);
-
-	pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n",
-		 __func__, new_opp->turbo, new_opp->rate, new_opp->u_volt,
-		 new_opp->u_volt_min, new_opp->u_volt_max,
-		 new_opp->clock_latency_ns);
-
-	/*
-	 * Notify the changes in the availability of the operable
-	 * frequency/voltage list.
-	 */
-	srcu_notifier_call_chain(&opp_table->srcu_head, OPP_EVENT_ADD, new_opp);
-	return 0;
-
-free_opp:
-	_opp_remove(opp_table, new_opp, false);
-unlock:
-	mutex_unlock(&opp_table_lock);
-	return ret;
-}
-
 /**
  * dev_pm_opp_add()  - Add an OPP table from a table definitions
  * @dev:	device for which we do this operation
@@ -1842,21 +1592,11 @@ struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_get_notifier);
 
-#ifdef CONFIG_OF
-/**
- * dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT
- *				  entries
- * @dev:	device pointer used to lookup OPP table.
- *
- * Free OPPs created using static entries present in DT.
- *
- * Locking: The internal opp_table and opp structures are RCU protected.
- * Hence this function indirectly uses RCU updater strategy with mutex locks
- * to keep the integrity of the internal data structures. Callers should ensure
- * that this function is *NOT* called under RCU protection or in contexts where
- * mutex cannot be locked.
+/*
+ * Free OPPs either created using static entries present in DT or even the
+ * dynamically added entries based on remove_all param.
  */
-void dev_pm_opp_of_remove_table(struct device *dev)
+void _dev_pm_opp_remove_table(struct device *dev, bool remove_all)
 {
 	struct opp_table *opp_table;
 	struct dev_pm_opp *opp, *tmp;
@@ -1881,7 +1621,7 @@ void dev_pm_opp_of_remove_table(struct device *dev)
 	if (list_is_singular(&opp_table->dev_list)) {
 		/* Free static OPPs */
 		list_for_each_entry_safe(opp, tmp, &opp_table->opp_list, node) {
-			if (!opp->dynamic)
+			if (remove_all || !opp->dynamic)
 				_opp_remove(opp_table, opp, true);
 		}
 	} else {
@@ -1891,160 +1631,22 @@ void dev_pm_opp_of_remove_table(struct device *dev)
 unlock:
 	mutex_unlock(&opp_table_lock);
 }
-EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table);
-
-/* Returns opp descriptor node for a device, caller must do of_node_put() */
-struct device_node *_of_get_opp_desc_node(struct device *dev)
-{
-	/*
-	 * TODO: Support for multiple OPP tables.
-	 *
-	 * There should be only ONE phandle present in "operating-points-v2"
-	 * property.
-	 */
-
-	return of_parse_phandle(dev->of_node, "operating-points-v2", 0);
-}
-
-/* Initializes OPP tables based on new bindings */
-static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
-{
-	struct device_node *np;
-	struct opp_table *opp_table;
-	int ret = 0, count = 0;
-
-	mutex_lock(&opp_table_lock);
-
-	opp_table = _managed_opp(opp_np);
-	if (opp_table) {
-		/* OPPs are already managed */
-		if (!_add_opp_dev(dev, opp_table))
-			ret = -ENOMEM;
-		mutex_unlock(&opp_table_lock);
-		return ret;
-	}
-	mutex_unlock(&opp_table_lock);
-
-	/* We have opp-table node now, iterate over it and add OPPs */
-	for_each_available_child_of_node(opp_np, np) {
-		count++;
-
-		ret = _opp_add_static_v2(dev, np);
-		if (ret) {
-			dev_err(dev, "%s: Failed to add OPP, %d\n", __func__,
-				ret);
-			goto free_table;
-		}
-	}
-
-	/* There should be one of more OPP defined */
-	if (WARN_ON(!count))
-		return -ENOENT;
-
-	mutex_lock(&opp_table_lock);
-
-	opp_table = _find_opp_table(dev);
-	if (WARN_ON(IS_ERR(opp_table))) {
-		ret = PTR_ERR(opp_table);
-		mutex_unlock(&opp_table_lock);
-		goto free_table;
-	}
-
-	opp_table->np = opp_np;
-	opp_table->shared_opp = of_property_read_bool(opp_np, "opp-shared");
-
-	mutex_unlock(&opp_table_lock);
-
-	return 0;
-
-free_table:
-	dev_pm_opp_of_remove_table(dev);
-
-	return ret;
-}
-
-/* Initializes OPP tables based on old-deprecated bindings */
-static int _of_add_opp_table_v1(struct device *dev)
-{
-	const struct property *prop;
-	const __be32 *val;
-	int nr;
-
-	prop = of_find_property(dev->of_node, "operating-points", NULL);
-	if (!prop)
-		return -ENODEV;
-	if (!prop->value)
-		return -ENODATA;
-
-	/*
-	 * Each OPP is a set of tuples consisting of frequency and
-	 * voltage like <freq-kHz vol-uV>.
-	 */
-	nr = prop->length / sizeof(u32);
-	if (nr % 2) {
-		dev_err(dev, "%s: Invalid OPP table\n", __func__);
-		return -EINVAL;
-	}
-
-	val = prop->value;
-	while (nr) {
-		unsigned long freq = be32_to_cpup(val++) * 1000;
-		unsigned long volt = be32_to_cpup(val++);
-
-		if (_opp_add_v1(dev, freq, volt, false))
-			dev_warn(dev, "%s: Failed to add OPP %ld\n",
-				 __func__, freq);
-		nr -= 2;
-	}
-
-	return 0;
-}
 
 /**
- * dev_pm_opp_of_add_table() - Initialize opp table from device tree
+ * dev_pm_opp_remove_table() - Free all OPPs associated with the device
  * @dev:	device pointer used to lookup OPP table.
  *
- * Register the initial OPP table with the OPP library for given device.
+ * Free both OPPs created using static entries present in DT and the
+ * dynamically added entries.
  *
  * Locking: The internal opp_table and opp structures are RCU protected.
  * Hence this function indirectly uses RCU updater strategy with mutex locks
  * to keep the integrity of the internal data structures. Callers should ensure
  * that this function is *NOT* called under RCU protection or in contexts where
  * mutex cannot be locked.
- *
- * Return:
- * 0		On success OR
- *		Duplicate OPPs (both freq and volt are same) and opp->available
- * -EEXIST	Freq are same and volt are different OR
- *		Duplicate OPPs (both freq and volt are same) and !opp->available
- * -ENOMEM	Memory allocation failure
- * -ENODEV	when 'operating-points' property is not found or is invalid data
- *		in device node.
- * -ENODATA	when empty 'operating-points' property is found
- * -EINVAL	when invalid entries are found in opp-v2 table
  */
-int dev_pm_opp_of_add_table(struct device *dev)
+void dev_pm_opp_remove_table(struct device *dev)
 {
-	struct device_node *opp_np;
-	int ret;
-
-	/*
-	 * OPPs have two version of bindings now. The older one is deprecated,
-	 * try for the new binding first.
-	 */
-	opp_np = _of_get_opp_desc_node(dev);
-	if (!opp_np) {
-		/*
-		 * Try old-deprecated bindings for backward compatibility with
-		 * older dtbs.
-		 */
-		return _of_add_opp_table_v1(dev);
-	}
-
-	ret = _of_add_opp_table_v2(dev, opp_np);
-	of_node_put(opp_np);
-
-	return ret;
+	_dev_pm_opp_remove_table(dev, true);
 }
-EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table);
-#endif
+EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table);