1 files changed, 32 insertions, 47 deletions

diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
index d423c9bdd71..f890b901c6b 100644
--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -21,10 +21,38 @@
 #include <linux/clkdev.h>
 #include <linux/of.h>
 
+#include "clk.h"
+
 static LIST_HEAD(clocks);
 static DEFINE_MUTEX(clocks_mutex);
 
 #if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
+
+/**
+ * of_clk_get_by_clkspec() - Lookup a clock form a clock provider
+ * @clkspec: pointer to a clock specifier data structure
+ *
+ * This function looks up a struct clk from the registered list of clock
+ * providers, an input is a clock specifier data structure as returned
+ * from the of_parse_phandle_with_args() function call.
+ */
+struct clk *of_clk_get_by_clkspec(struct of_phandle_args *clkspec)
+{
+	struct clk *clk;
+
+	if (!clkspec)
+		return ERR_PTR(-EINVAL);
+
+	of_clk_lock();
+	clk = __of_clk_get_from_provider(clkspec);
+
+	if (!IS_ERR(clk) && !__clk_get(clk))
+		clk = ERR_PTR(-ENOENT);
+
+	of_clk_unlock();
+	return clk;
+}
+
 struct clk *of_clk_get(struct device_node *np, int index)
 {
 	struct of_phandle_args clkspec;
@@ -39,7 +67,7 @@ struct clk *of_clk_get(struct device_node *np, int index)
 	if (rc)
 		return ERR_PTR(rc);
 
-	clk = of_clk_get_from_provider(&clkspec);
+	clk = of_clk_get_by_clkspec(&clkspec);
 	of_node_put(clkspec.np);
 	return clk;
 }
@@ -157,7 +185,9 @@ struct clk *clk_get(struct device *dev, const char *con_id)
 
 	if (dev) {
 		clk = of_clk_get_by_name(dev->of_node, con_id);
-		if (!IS_ERR(clk) && __clk_get(clk))
+		if (!IS_ERR(clk))
+			return clk;
+		if (PTR_ERR(clk) == -EPROBE_DEFER)
 			return clk;
 	}
 
@@ -171,51 +201,6 @@ void clk_put(struct clk *clk)
 }
 EXPORT_SYMBOL(clk_put);
 
-static void devm_clk_release(struct device *dev, void *res)
-{
-	clk_put(*(struct clk **)res);
-}
-
-struct clk *devm_clk_get(struct device *dev, const char *id)
-{
-	struct clk **ptr, *clk;
-
-	ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
-	if (!ptr)
-		return ERR_PTR(-ENOMEM);
-
-	clk = clk_get(dev, id);
-	if (!IS_ERR(clk)) {
-		*ptr = clk;
-		devres_add(dev, ptr);
-	} else {
-		devres_free(ptr);
-	}
-
-	return clk;
-}
-EXPORT_SYMBOL(devm_clk_get);
-
-static int devm_clk_match(struct device *dev, void *res, void *data)
-{
-	struct clk **c = res;
-	if (!c || !*c) {
-		WARN_ON(!c || !*c);
-		return 0;
-	}
-	return *c == data;
-}
-
-void devm_clk_put(struct device *dev, struct clk *clk)
-{
-	int ret;
-
-	ret = devres_destroy(dev, devm_clk_release, devm_clk_match, clk);
-
-	WARN_ON(ret);
-}
-EXPORT_SYMBOL(devm_clk_put);
-
 void clkdev_add(struct clk_lookup *cl)
 {
 	mutex_lock(&clocks_mutex);