of: consolidate linker section OF match table declarations

We now have several OF match tables using linker sections that are
nearly the same definition. The only variation is the callback function
prototype. Create a common define for creating linker section OF match
table entries which each table declaration can use.

Acked-by: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Rob Herring <robh@kernel.org>

1 files changed, 22 insertions, 0 deletions

diff --git a/include/linux/of.h b/include/linux/of.h
index 3bad8d106e0e..bf65335b4d05 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -757,4 +757,26 @@ static inline int of_get_available_child_count(const struct device_node *np)
         return num;
 }
 
+#ifdef CONFIG_OF
+#define _OF_DECLARE(table, name, compat, fn, fn_type)                   \
+        static const struct of_device_id __of_table_##name              \
+                __used __section(__##table##_of_table)                  \
+                 = { .compatible = compat,                              \
+                     .data = (fn == (fn_type)NULL) ? fn : fn  }
+#else
+#define _OF_DECLARE(table, name, compat, fn, fn_type)                                   \
+        static const struct of_device_id __of_table_##name              \
+                __attribute__((unused))                                 \
+                 = { .compatible = compat,                              \
+                     .data = (fn == (fn_type)NULL) ? fn : fn }
+#endif
+
+typedef int (*of_init_fn_2)(struct device_node *, struct device_node *);
+typedef void (*of_init_fn_1)(struct device_node *);
+
+#define OF_DECLARE_1(table, name, compat, fn) \
+                _OF_DECLARE(table, name, compat, fn, of_init_fn_1)
+#define OF_DECLARE_2(table, name, compat, fn) \
+                _OF_DECLARE(table, name, compat, fn, of_init_fn_2)
+
 #endif /* _LINUX_OF_H */