Merge branch 'clk-bulk-get' into clk-next

* clk-bulk-get:
  clk: add managed version of clk_bulk_get
  clk: add clk_bulk_get accessories

1 files changed, 132 insertions, 0 deletions

diff --git a/include/linux/clk.h b/include/linux/clk.h
index e790d19b8ffb..91bd464f4c9b 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -77,6 +77,21 @@ struct clk_notifier_data {
 	unsigned long		new_rate;
 };
 
+/**
+ * struct clk_bulk_data - Data used for bulk clk operations.
+ *
+ * @id: clock consumer ID
+ * @clk: struct clk * to store the associated clock
+ *
+ * The CLK APIs provide a series of clk_bulk_() API calls as
+ * a convenience to consumers which require multiple clks.  This
+ * structure is used to manage data for these calls.
+ */
+struct clk_bulk_data {
+	const char		*id;
+	struct clk		*clk;
+};
+
 #ifdef CONFIG_COMMON_CLK
 
 /**
@@ -185,12 +200,20 @@ static inline bool clk_is_match(const struct clk *p, const struct clk *q)
  */
 #ifdef CONFIG_HAVE_CLK_PREPARE
 int clk_prepare(struct clk *clk);
+int __must_check clk_bulk_prepare(int num_clks,
+				  const struct clk_bulk_data *clks);
 #else
 static inline int clk_prepare(struct clk *clk)
 {
 	might_sleep();
 	return 0;
 }
+
+static inline int clk_bulk_prepare(int num_clks, struct clk_bulk_data *clks)
+{
+	might_sleep();
+	return 0;
+}
 #endif
 
 /**
@@ -204,11 +227,16 @@ static inline int clk_prepare(struct clk *clk)
  */
 #ifdef CONFIG_HAVE_CLK_PREPARE
 void clk_unprepare(struct clk *clk);
+void clk_bulk_unprepare(int num_clks, const struct clk_bulk_data *clks);
 #else
 static inline void clk_unprepare(struct clk *clk)
 {
 	might_sleep();
 }
+static inline void clk_bulk_unprepare(int num_clks, struct clk_bulk_data *clks)
+{
+	might_sleep();
+}
 #endif
 
 #ifdef CONFIG_HAVE_CLK
@@ -230,6 +258,44 @@ static inline void clk_unprepare(struct clk *clk)
 struct clk *clk_get(struct device *dev, const char *id);
 
 /**
+ * clk_bulk_get - lookup and obtain a number of references to clock producer.
+ * @dev: device for clock "consumer"
+ * @num_clks: the number of clk_bulk_data
+ * @clks: the clk_bulk_data table of consumer
+ *
+ * This helper function allows drivers to get several clk consumers in one
+ * operation. If any of the clk cannot be acquired then any clks
+ * that were obtained will be freed before returning to the caller.
+ *
+ * Returns 0 if all clocks specified in clk_bulk_data table are obtained
+ * successfully, or valid IS_ERR() condition containing errno.
+ * The implementation uses @dev and @clk_bulk_data.id to determine the
+ * clock consumer, and thereby the clock producer.
+ * The clock returned is stored in each @clk_bulk_data.clk field.
+ *
+ * Drivers must assume that the clock source is not enabled.
+ *
+ * clk_bulk_get should not be called from within interrupt context.
+ */
+int __must_check clk_bulk_get(struct device *dev, int num_clks,
+			      struct clk_bulk_data *clks);
+
+/**
+ * devm_clk_bulk_get - managed get multiple clk consumers
+ * @dev: device for clock "consumer"
+ * @num_clks: the number of clk_bulk_data
+ * @clks: the clk_bulk_data table of consumer
+ *
+ * Return 0 on success, an errno on failure.
+ *
+ * This helper function allows drivers to get several clk
+ * consumers in one operation with management, the clks will
+ * automatically be freed when the device is unbound.
+ */
+int __must_check devm_clk_bulk_get(struct device *dev, int num_clks,
+				   struct clk_bulk_data *clks);
+
+/**
  * devm_clk_get - lookup and obtain a managed reference to a clock producer.
  * @dev: device for clock "consumer"
  * @id: clock consumer ID
@@ -279,6 +345,18 @@ struct clk *devm_get_clk_from_child(struct device *dev,
 int clk_enable(struct clk *clk);
 
 /**
+ * clk_bulk_enable - inform the system when the set of clks should be running.
+ * @num_clks: the number of clk_bulk_data
+ * @clks: the clk_bulk_data table of consumer
+ *
+ * May be called from atomic contexts.
+ *
+ * Returns success (0) or negative errno.
+ */
+int __must_check clk_bulk_enable(int num_clks,
+				 const struct clk_bulk_data *clks);
+
+/**
  * clk_disable - inform the system when the clock source is no longer required.
  * @clk: clock source
  *
@@ -295,6 +373,24 @@ int clk_enable(struct clk *clk);
 void clk_disable(struct clk *clk);
 
 /**
+ * clk_bulk_disable - inform the system when the set of clks is no
+ *		      longer required.
+ * @num_clks: the number of clk_bulk_data
+ * @clks: the clk_bulk_data table of consumer
+ *
+ * Inform the system that a set of clks is no longer required by
+ * a driver and may be shut down.
+ *
+ * May be called from atomic contexts.
+ *
+ * Implementation detail: if the set of clks is shared between
+ * multiple drivers, clk_bulk_enable() calls must be balanced by the
+ * same number of clk_bulk_disable() calls for the clock source to be
+ * disabled.
+ */
+void clk_bulk_disable(int num_clks, const struct clk_bulk_data *clks);
+
+/**
  * clk_get_rate - obtain the current clock rate (in Hz) for a clock source.
  *		  This is only valid once the clock source has been enabled.
  * @clk: clock source
@@ -314,6 +410,19 @@ unsigned long clk_get_rate(struct clk *clk);
 void clk_put(struct clk *clk);
 
 /**
+ * clk_bulk_put	- "free" the clock source
+ * @num_clks: the number of clk_bulk_data
+ * @clks: the clk_bulk_data table of consumer
+ *
+ * Note: drivers must ensure that all clk_bulk_enable calls made on this
+ * clock source are balanced by clk_bulk_disable calls prior to calling
+ * this function.
+ *
+ * clk_bulk_put should not be called from within interrupt context.
+ */
+void clk_bulk_put(int num_clks, struct clk_bulk_data *clks);
+
+/**
  * devm_clk_put	- "free" a managed clock source
  * @dev: device used to acquire the clock
  * @clk: clock source acquired with devm_clk_get()
@@ -445,11 +554,23 @@ static inline struct clk *clk_get(struct device *dev, const char *id)
 	return NULL;
 }
 
+static inline int clk_bulk_get(struct device *dev, int num_clks,
+			       struct clk_bulk_data *clks)
+{
+	return 0;
+}
+
 static inline struct clk *devm_clk_get(struct device *dev, const char *id)
 {
 	return NULL;
 }
 
+static inline int devm_clk_bulk_get(struct device *dev, int num_clks,
+				    struct clk_bulk_data *clks)
+{
+	return 0;
+}
+
 static inline struct clk *devm_get_clk_from_child(struct device *dev,
 				struct device_node *np, const char *con_id)
 {
@@ -458,6 +579,8 @@ static inline struct clk *devm_get_clk_from_child(struct device *dev,
 
 static inline void clk_put(struct clk *clk) {}
 
+static inline void clk_bulk_put(int num_clks, struct clk_bulk_data *clks) {}
+
 static inline void devm_clk_put(struct device *dev, struct clk *clk) {}
 
 static inline int clk_enable(struct clk *clk)
@@ -465,8 +588,17 @@ static inline int clk_enable(struct clk *clk)
 	return 0;
 }
 
+static inline int clk_bulk_enable(int num_clks, struct clk_bulk_data *clks)
+{
+	return 0;
+}
+
 static inline void clk_disable(struct clk *clk) {}
 
+
+static inline void clk_bulk_disable(int num_clks,
+				    struct clk_bulk_data *clks) {}
+
 static inline unsigned long clk_get_rate(struct clk *clk)
 {
 	return 0;