clk: Forward declare struct of_device_id in linux/clk.h

Forward declare struct of_device_id in linux/clk.h in order to avoid
warnings like the following:

warning: 'struct of_device_id' declared inside parameter list will not be visible outside
of this definition or declaration
 int of_clk_init(struct device_node *root, const struct of_device_id *matches);
                                                        ^~~~~~~~~~~~

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/clk.h b/include/linux/clk.h
index 081a859729..c6465b1c90 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -323,6 +323,7 @@ struct clk *clk_register_composite(const char *name,
 
 struct device_node;
 struct of_phandle_args;
+struct of_device_id;
 
 #if defined(CONFIG_COMMON_CLK_OF_PROVIDER)