of: Merge of_platform_bus_type with platform_bus_type

of_platform_bus was being used in the same manner as the platform_bus.
The only difference being that of_platform_bus devices are generated
from data in the device tree, and platform_bus devices are usually
statically allocated in platform code.  Having them separate causes
the problem of device drivers having to be registered twice if it
was possible for the same device to appear on either bus.

This patch removes of_platform_bus_type and registers all of_platform
bus devices and drivers on the platform bus instead.  A previous patch
made the of_device structure an alias for the platform_device structure,
and a shim is used to adapt of_platform_drivers to the platform bus.

After all of of_platform_bus drivers are converted to be normal platform
drivers, the shim code can be removed.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 13 deletions

diff --git a/include/linux/of_platform.h b/include/linux/of_platform.h
index a51fd30176aa..133ecf31a60f 100644
--- a/include/linux/of_platform.h
+++ b/include/linux/of_platform.h
@@ -17,19 +17,19 @@
 #include <linux/mod_devicetable.h>
 #include <linux/pm.h>
 #include <linux/of_device.h>
+#include <linux/platform_device.h>
 
 /*
- * The of_platform_bus_type is a bus type used by drivers that do not
- * attach to a macio or similar bus but still use OF probing
- * mechanism
+ * of_platform_bus_type isn't it's own bus anymore.  It's now just an alias
+ * for the platform bus.
  */
-extern struct bus_type of_platform_bus_type;
+#define of_platform_bus_type platform_bus_type
 
 extern const struct of_device_id of_default_bus_ids[];
 
 /*
  * An of_platform_driver driver is attached to a basic of_device on
- * the "platform bus" (of_platform_bus_type).
+ * the "platform bus" (platform_bus_type).
  */
 struct of_platform_driver
 {
@@ -42,6 +42,7 @@ struct of_platform_driver
         int     (*shutdown)(struct of_device* dev);
 
         struct device_driver    driver;
+        struct platform_driver  platform_driver;
 };
 #define to_of_platform_driver(drv) \
         container_of(drv,struct of_platform_driver, driver)
@@ -51,14 +52,8 @@ extern int of_register_driver(struct of_platform_driver *drv,
 extern void of_unregister_driver(struct of_platform_driver *drv);
 
 /* Platform drivers register/unregister */
-static inline int of_register_platform_driver(struct of_platform_driver *drv)
-{
-        return of_register_driver(drv, &of_platform_bus_type);
-}
-static inline void of_unregister_platform_driver(struct of_platform_driver *drv)
-{
-        of_unregister_driver(drv);
-}
+extern int of_register_platform_driver(struct of_platform_driver *drv);
+extern void of_unregister_platform_driver(struct of_platform_driver *drv);
 
 extern struct of_device *of_device_alloc(struct device_node *np,
                                          const char *bus_id,