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>
diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
index a360b2e..f890b90 100644
--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -27,6 +27,32 @@
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 @@
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;
}
