1 files changed, 131 insertions, 61 deletions

diff --git a/include/linux/clk.h b/include/linux/clk.h
index ad5c43e8ae8a..b3ac22d0fc1f 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -12,6 +12,7 @@
 #ifndef __LINUX_CLK_H
 #define __LINUX_CLK_H
 
+#include <linux/err.h>
 #include <linux/kernel.h>
 #include <linux/notifier.h>
 
@@ -84,9 +85,46 @@ int clk_notifier_unregister(struct clk *clk, struct notifier_block *nb);
 #endif
 
 /**
+ * clk_prepare - prepare a clock source
+ * @clk: clock source
+ *
+ * This prepares the clock source for use.
+ *
+ * Must not be called from within atomic context.
+ */
+#ifdef CONFIG_HAVE_CLK_PREPARE
+int clk_prepare(struct clk *clk);
+#else
+static inline int clk_prepare(struct clk *clk)
+{
+        might_sleep();
+        return 0;
+}
+#endif
+
+/**
+ * clk_unprepare - undo preparation of a clock source
+ * @clk: clock source
+ *
+ * This undoes a previously prepared clock.  The caller must balance
+ * the number of prepare and unprepare calls.
+ *
+ * Must not be called from within atomic context.
+ */
+#ifdef CONFIG_HAVE_CLK_PREPARE
+void clk_unprepare(struct clk *clk);
+#else
+static inline void clk_unprepare(struct clk *clk)
+{
+        might_sleep();
+}
+#endif
+
+#ifdef CONFIG_HAVE_CLK
+/**
  * clk_get - lookup and obtain a reference to a clock producer.
  * @dev: device for clock "consumer"
- * @id: clock comsumer ID
+ * @id: clock consumer ID
  *
  * Returns a struct clk corresponding to the clock producer, or
  * valid IS_ERR() condition containing errno.  The implementation
@@ -103,7 +141,7 @@ struct clk *clk_get(struct device *dev, const char *id);
 /**
  * devm_clk_get - lookup and obtain a managed reference to a clock producer.
  * @dev: device for clock "consumer"
- * @id: clock comsumer ID
+ * @id: clock consumer ID
  *
  * Returns a struct clk corresponding to the clock producer, or
  * valid IS_ERR() condition containing errno.  The implementation
@@ -121,24 +159,6 @@ struct clk *clk_get(struct device *dev, const char *id);
 struct clk *devm_clk_get(struct device *dev, const char *id);
 
 /**
- * clk_prepare - prepare a clock source
- * @clk: clock source
- *
- * This prepares the clock source for use.
- *
- * Must not be called from within atomic context.
- */
-#ifdef CONFIG_HAVE_CLK_PREPARE
-int clk_prepare(struct clk *clk);
-#else
-static inline int clk_prepare(struct clk *clk)
-{
-        might_sleep();
-        return 0;
-}
-#endif
-
-/**
  * clk_enable - inform the system when the clock source should be running.
  * @clk: clock source
  *
@@ -166,47 +186,6 @@ int clk_enable(struct clk *clk);
  */
 void clk_disable(struct clk *clk);
 
-
-/**
- * clk_unprepare - undo preparation of a clock source
- * @clk: clock source
- *
- * This undoes a previously prepared clock.  The caller must balance
- * the number of prepare and unprepare calls.
- *
- * Must not be called from within atomic context.
- */
-#ifdef CONFIG_HAVE_CLK_PREPARE
-void clk_unprepare(struct clk *clk);
-#else
-static inline void clk_unprepare(struct clk *clk)
-{
-        might_sleep();
-}
-#endif
-
-/* clk_prepare_enable helps cases using clk_enable in non-atomic context. */
-static inline int clk_prepare_enable(struct clk *clk)
-{
-        int ret;
-
-        ret = clk_prepare(clk);
-        if (ret)
-                return ret;
-        ret = clk_enable(clk);
-        if (ret)
-                clk_unprepare(clk);
-
-        return ret;
-}
-
-/* clk_disable_unprepare helps cases using clk_disable in non-atomic context. */
-static inline void clk_disable_unprepare(struct clk *clk)
-{
-        clk_disable(clk);
-        clk_unprepare(clk);
-}
-
 /**
  * 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.
@@ -297,6 +276,78 @@ struct clk *clk_get_parent(struct clk *clk);
  */
 struct clk *clk_get_sys(const char *dev_id, const char *con_id);
 
+#else /* !CONFIG_HAVE_CLK */
+
+static inline struct clk *clk_get(struct device *dev, const char *id)
+{
+        return NULL;
+}
+
+static inline struct clk *devm_clk_get(struct device *dev, const char *id)
+{
+        return NULL;
+}
+
+static inline void clk_put(struct clk *clk) {}
+
+static inline void devm_clk_put(struct device *dev, struct clk *clk) {}
+
+static inline int clk_enable(struct clk *clk)
+{
+        return 0;
+}
+
+static inline void clk_disable(struct clk *clk) {}
+
+static inline unsigned long clk_get_rate(struct clk *clk)
+{
+        return 0;
+}
+
+static inline int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+        return 0;
+}
+
+static inline long clk_round_rate(struct clk *clk, unsigned long rate)
+{
+        return 0;
+}
+
+static inline int clk_set_parent(struct clk *clk, struct clk *parent)
+{
+        return 0;
+}
+
+static inline struct clk *clk_get_parent(struct clk *clk)
+{
+        return NULL;
+}
+
+#endif
+
+/* clk_prepare_enable helps cases using clk_enable in non-atomic context. */
+static inline int clk_prepare_enable(struct clk *clk)
+{
+        int ret;
+
+        ret = clk_prepare(clk);
+        if (ret)
+                return ret;
+        ret = clk_enable(clk);
+        if (ret)
+                clk_unprepare(clk);
+
+        return ret;
+}
+
+/* clk_disable_unprepare helps cases using clk_disable in non-atomic context. */
+static inline void clk_disable_unprepare(struct clk *clk)
+{
+        clk_disable(clk);
+        clk_unprepare(clk);
+}
+
 /**
  * clk_add_alias - add a new clock alias
  * @alias: name for clock alias
@@ -310,4 +361,23 @@ struct clk *clk_get_sys(const char *dev_id, const char *con_id);
 int clk_add_alias(const char *alias, const char *alias_dev_name, char *id,
                         struct device *dev);
 
+struct device_node;
+struct of_phandle_args;
+
+#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
+struct clk *of_clk_get(struct device_node *np, int index);
+struct clk *of_clk_get_by_name(struct device_node *np, const char *name);
+struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec);
+#else
+static inline struct clk *of_clk_get(struct device_node *np, int index)
+{
+        return ERR_PTR(-ENOENT);
+}
+static inline struct clk *of_clk_get_by_name(struct device_node *np,
+                                             const char *name)
+{
+        return ERR_PTR(-ENOENT);
+}
+#endif
+
 #endif