clk: Add of_clk_get_by_clkspec() helper

This patch adds of_clk_get_by_clkspec() helper function, which does only
a struct clk lookup from the clock providers. It is used in the subsequent
patch where parsing of a clock from device tree and the lookup from
providers needed to be split.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

2 files changed, 28 insertions, 7 deletions

diff --git a/drivers/clk/clk.h b/drivers/clk/clk.h
index 795cc9f0dac0..c798138f023f 100644
--- a/drivers/clk/clk.h
+++ b/drivers/clk/clk.h
@@ -10,6 +10,7 @@
  */
 
 #if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
+struct clk *of_clk_get_by_clkspec(struct of_phandle_args *clkspec);
 struct clk *__of_clk_get_from_provider(struct of_phandle_args *clkspec);
 void of_clk_lock(void);
 void of_clk_unlock(void);
diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
index a360b2eca5cb..f890b901c6bc 100644
--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -27,6 +27,32 @@ 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;
@@ -41,13 +67,7 @@ struct clk *of_clk_get(struct device_node *np, int index)
         if (rc)
                 return ERR_PTR(rc);
 
-        of_clk_lock();
-        clk = __of_clk_get_from_provider(&clkspec);
-
-        if (!IS_ERR(clk) && !__clk_get(clk))
-                clk = ERR_PTR(-ENOENT);
-
-        of_clk_unlock();
+        clk = of_clk_get_by_clkspec(&clkspec);
         of_node_put(clkspec.np);
         return clk;
 }