drivercore: Add of_match_table to the common device drivers

OF-style matching can be available to any device, on any type of bus.
This patch allows any driver to provide an OF match table when CONFIG_OF
is enabled so that drivers can be bound against devices described in
the device tree.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>

arch/powerpc/kernel/ibmebus.c

@@ -201,8 +201,11 @@ static int ibmebus_create_devices(const struct of_device_id *matches)
 
 int ibmebus_register_driver(struct of_platform_driver *drv)
 {
+	if (!drv->driver.of_match_table)
+		drv->driver.of_match_table = drv->match_table;
+
 	/* If the driver uses devices that ibmebus doesn't know, add them */
-	ibmebus_create_devices(drv->match_table);
+	ibmebus_create_devices(drv->driver.of_match_table);
 
 	return of_register_driver(drv, &ibmebus_bus_type);
 }

drivers/macintosh/macio_asic.c

@@ -40,8 +40,7 @@ static struct macio_chip      *macio_on_hold;
 static int macio_bus_match(struct device *dev, struct device_driver *drv) 
 {
 	struct macio_dev * macio_dev = to_macio_device(dev);
-	struct macio_driver * macio_drv = to_macio_driver(drv);
-	const struct of_device_id * matches = macio_drv->match_table;
+	const struct of_device_id * matches = drv->of_match_table;
 
 	if (!matches) 
 		return 0;
@@ -84,7 +83,7 @@ static int macio_device_probe(struct device *dev)
 
 	macio_dev_get(macio_dev);
 
-	match = of_match_device(drv->match_table, &macio_dev->ofdev);
+	match = of_match_device(drv->driver.of_match_table, &macio_dev->ofdev);
 	if (match)
 		error = drv->probe(macio_dev, match);
 	if (error)

drivers/of/platform.c

@@ -22,8 +22,7 @@ extern struct device_attribute of_platform_device_attrs[];
 static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
 {
 	struct of_device *of_dev = to_of_device(dev);
-	struct of_platform_driver *of_drv = to_of_platform_driver(drv);
-	const struct of_device_id *matches = of_drv->match_table;
+	const struct of_device_id *matches = drv->of_match_table;
 
 	if (!matches)
 		return 0;
@@ -46,7 +45,7 @@ static int of_platform_device_probe(struct device *dev)
 
 	of_dev_get(of_dev);
 
-	match = of_match_device(drv->match_table, of_dev);
+	match = of_match_device(drv->driver.of_match_table, of_dev);
 	if (match)
 		error = drv->probe(of_dev, match);
 	if (error)
@@ -391,6 +390,8 @@ int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus)
 		drv->driver.name = drv->name;
 	if (!drv->driver.owner)
 		drv->driver.owner = drv->owner;
+	if (!drv->driver.of_match_table)
+		drv->driver.of_match_table = drv->match_table;
 	drv->driver.bus = bus;
 
 	/* register with core */

include/linux/device.h

@@ -129,6 +129,10 @@ struct device_driver {
 
 	bool suppress_bind_attrs;	/* disables bind/unbind via sysfs */
 
+#if defined(CONFIG_OF)
+	const struct of_device_id	*of_match_table;
+#endif
+
 	int (*probe) (struct device *dev);
 	int (*remove) (struct device *dev);
 	void (*shutdown) (struct device *dev);