drivercore/dt: add a match table pointer to struct device

Add a new .of_match field to struct device which points at the
matching device driver .of_match_table entry when a device is probed
via the device tree
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
Acked-by: NGreg Kroah-Hartman <gregkh@suse.de>

include/linux/device.h

@@ -441,6 +441,7 @@ struct device {
 	struct dev_archdata	archdata;
 
 	struct device_node	*of_node; /* associated device tree node */
+	const struct of_device_id *of_match; /* matching of_device_id from driver */
 
 	dev_t			devt;	/* dev_t, creates the sysfs "dev" */
 

include/linux/of_device.h

@@ -18,10 +18,11 @@ extern void of_device_make_bus_id(struct device *dev);
  * @drv: the device_driver structure to test
  * @dev: the device structure to match against
  */
-static inline int of_driver_match_device(const struct device *dev,
+static inline int of_driver_match_device(struct device *dev,
 					 const struct device_driver *drv)
 {
-	return of_match_device(drv->of_match_table, dev) != NULL;
+	dev->of_match = of_match_device(drv->of_match_table, dev);
+	return dev->of_match != NULL;
 }
 
 extern struct platform_device *of_dev_get(struct platform_device *dev);