clk: core: copy parent_names & return error codes

This patch cleans up clk_register and solves a few bugs by teaching
clk_register and __clk_init to return error codes (instead of just NULL)
to better align with the existing clk.h api.

Along with that change this patch also introduces a new behavior whereby
clk_register copies the parent_names array, thus allowing platforms to
declare their parent_names arrays as __initdata.

Signed-off-by: Mike Turquette <mturquette@linaro.org>

2 files changed, 5 insertions, 2 deletions

diff --git a/include/linux/clk-private.h b/include/linux/clk-private.h
index e9c8b9841b16..e7032fdd45eb 100644
--- a/include/linux/clk-private.h
+++ b/include/linux/clk-private.h
@@ -181,8 +181,10 @@ struct clk {
  *
  * It is not necessary to call clk_register if __clk_init is used directly with
  * statically initialized clock data.
+ *
+ * Returns 0 on success, otherwise an error code.
  */
-void __clk_init(struct device *dev, struct clk *clk);
+int __clk_init(struct device *dev, struct clk *clk);
 
 #endif /* CONFIG_COMMON_CLK */
 #endif /* CLK_PRIVATE_H */
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 8981435f9064..97f9fabf3be2 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -274,7 +274,8 @@ struct clk *clk_register_mux(struct device *dev, const char *name,
  * clk_register is the primary interface for populating the clock tree with new
  * clock nodes.  It returns a pointer to the newly allocated struct clk which
  * cannot be dereferenced by driver code but may be used in conjuction with the
- * rest of the clock API.
+ * rest of the clock API.  In the event of an error clk_register will return an
+ * error code; drivers must test for an error code after calling clk_register.
  */
 struct clk *clk_register(struct device *dev, const char *name,
                 const struct clk_ops *ops, struct clk_hw *hw,