clk: add non CONFIG_OF routines for clk-provider

Some drivers that are shared between architectures have HAVE_CLK selected
but don't have OF. To remove compilation errors for drivers that provide
clocks on DT with of_clk_add_provider we would have to enclose these calls
within #ifdef CONFIG_OF, #endif.

This patch adds some stubs for OF related clk-provider functions that
either do nothing or return appropriate values if CONFIG_OF is not set.
So, definition of these routines will always be available.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

include/linux/clk-provider.h

@@ -423,6 +423,17 @@ struct of_device_id;
 
 typedef void (*of_clk_init_cb_t)(struct device_node *);
 
+struct clk_onecell_data {
+	struct clk **clks;
+	unsigned int clk_num;
+};
+
+#define CLK_OF_DECLARE(name, compat, fn)			\
+	static const struct of_device_id __clk_of_table_##name	\
+		__used __section(__clk_of_table)		\
+		= { .compatible = compat, .data = fn };
+
+#ifdef CONFIG_OF
 int of_clk_add_provider(struct device_node *np,
 			struct clk *(*clk_src_get)(struct of_phandle_args *args,
 						   void *data),
@@ -430,19 +441,39 @@ int of_clk_add_provider(struct device_node *np,
 void of_clk_del_provider(struct device_node *np);
 struct clk *of_clk_src_simple_get(struct of_phandle_args *clkspec,
 				  void *data);
-struct clk_onecell_data {
-	struct clk **clks;
-	unsigned int clk_num;
-};
 struct clk *of_clk_src_onecell_get(struct of_phandle_args *clkspec, void *data);
 const char *of_clk_get_parent_name(struct device_node *np, int index);
 
 void of_clk_init(const struct of_device_id *matches);
 
-#define CLK_OF_DECLARE(name, compat, fn)			\
-	static const struct of_device_id __clk_of_table_##name	\
-		__used __section(__clk_of_table)		\
-		= { .compatible = compat, .data = fn };
+#else /* !CONFIG_OF */
 
+static inline int of_clk_add_provider(struct device_node *np,
+			struct clk *(*clk_src_get)(struct of_phandle_args *args,
+						   void *data),
+			void *data)
+{
+	return 0;
+}
+#define of_clk_del_provider(np) \
+	{ while (0); }
+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_src_onecell_get(
+	struct of_phandle_args *clkspec, void *data)
+{
+	return ERR_PTR(-ENOENT);
+}
+static inline const char *of_clk_get_parent_name(struct device_node *np,
+						 int index)
+{
+	return NULL;
+}
+#define of_clk_init(matches) \
+	{ while (0); }
+#endif /* CONFIG_OF */
 #endif /* CONFIG_COMMON_CLK */
 #endif /* CLK_PROVIDER_H */