[PATCH v2] clk: No-op CLK_OF_DECLARE if not enabled

[Andrey Smirnov]

Instead of wrapping each defenition of CLK_OF_DECLARE hook with
preprocessor guards, change the definition of CLK_OF_DECLARE to expand
into no-op if COMMON_CLK_OF_PROVIDER is not enabled.

Signed-off-by: Andrey Smirnov <andrew.smirnov at gmail.com>
---
 drivers/clk/clk-fixed-factor.c |  2 --
 drivers/clk/clk-fixed.c        |  3 +--
 include/linux/clk.h            | 31 +++++++++++++++++++++++++------
 3 files changed, 26 insertions(+), 10 deletions(-)

diff --git a/drivers/clk/clk-fixed-factor.c b/drivers/clk/clk-fixed-factor.c
index a3dbf33..0be4855 100644
--- a/drivers/clk/clk-fixed-factor.c
+++ b/drivers/clk/clk-fixed-factor.c
@@ -93,7 +93,6 @@ struct clk *clk_fixed_factor(const char *name,
 	return &f->clk;
 }
 
-#if defined(CONFIG_COMMON_CLK_OF_PROVIDER)
 /**
  * of_fixed_factor_clk_setup() - Setup function for simple fixed factor clock
  */
@@ -127,4 +126,3 @@ static int of_fixed_factor_clk_setup(struct device_node *node)
 }
 CLK_OF_DECLARE(fixed_factor_clk, "fixed-factor-clock",
 		of_fixed_factor_clk_setup);
-#endif
diff --git a/drivers/clk/clk-fixed.c b/drivers/clk/clk-fixed.c
index f0f7fba..9fa9a93 100644
--- a/drivers/clk/clk-fixed.c
+++ b/drivers/clk/clk-fixed.c
@@ -55,7 +55,6 @@ struct clk *clk_fixed(const char *name, int rate)
 	return &fix->clk;
 }
 
-#if defined(CONFIG_COMMON_CLK_OF_PROVIDER)
 /**
  * of_fixed_clk_setup() - Setup function for simple fixed rate clock
  */
@@ -76,4 +75,4 @@ static int of_fixed_clk_setup(struct device_node *node)
 	return of_clk_add_provider(node, of_clk_src_simple_get, clk);
 }
 CLK_OF_DECLARE(fixed_clk, "fixed-clock", of_fixed_clk_setup);
-#endif
+
diff --git a/include/linux/clk.h b/include/linux/clk.h
index a061398..081a859 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -324,16 +324,13 @@ struct clk *clk_register_composite(const char *name,
 struct device_node;
 struct of_phandle_args;
 
+#if defined(CONFIG_COMMON_CLK_OF_PROVIDER)
+
 #define CLK_OF_DECLARE(name, compat, fn)				\
 const struct of_device_id __clk_of_table_##name				\
 __attribute__ ((unused,section (".__clk_of_table"))) \
 	= { .compatible = compat, .data = fn }
 
-#if defined(CONFIG_COMMON_CLK_OF_PROVIDER)
-int of_clk_add_provider(struct device_node *np,
-			struct clk *(*clk_src_get)(struct of_phandle_args *args,
-						   void *data),
-			void *data);
 void of_clk_del_provider(struct device_node *np);
 
 typedef int (*of_clk_init_cb_t)(struct device_node *);
@@ -349,11 +346,27 @@ struct clk *of_clk_get(struct device_node *np, int index);
 struct clk *of_clk_get_by_name(struct device_node *np, const char *name);
 struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec);
 unsigned int of_clk_get_parent_count(struct device_node *np);
-char *of_clk_get_parent_name(struct device_node *np, unsigned int index);
 int of_clk_parent_fill(struct device_node *np, const char **parents,
 		       unsigned int size);
 int of_clk_init(struct device_node *root, const struct of_device_id *matches);
 #else
+
+
+/*
+ * Create a dummy variable to avoid 'unused function'
+ * warnings. Compiler should be smart enough to throw it out.
+ */
+#define CLK_OF_DECLARE(name, compat, fn)				\
+static const struct of_device_id __clk_of_table_##name			\
+__attribute__ ((unused)) = { .data = fn }
+
+
+static inline struct clk *
+of_clk_src_simple_get(struct of_phandle_args *clkspec, void *data)
+{
+	return ERR_PTR(-ENOENT);
+}
+
 static inline struct clk *of_clk_get(struct device_node *np, int index)
 {
 	return ERR_PTR(-ENOENT);
@@ -374,4 +387,10 @@ struct string_list;
 
 int clk_name_complete(struct string_list *sl, char *instr);
 
+int of_clk_add_provider(struct device_node *np,
+			struct clk *(*clk_src_get)(struct of_phandle_args *args,
+						   void *data),
+			void *data);
+char *of_clk_get_parent_name(struct device_node *np, unsigned int index);
+
 #endif
-- 
2.9.3