ARM: OMAP: omap_device: keep track of driver bound status

Use the bus notifier to keep track of driver bound status by adding a
new internal field to struct omap_device: _driver_status.

This will be useful for follow-up patches which need to know whether
or not a driver is bound in order to make intelligent omap_device
enable/idle decisions.
Reviewed-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>

arch/arm/plat-omap/include/plat/omap_device.h

@@ -60,6 +60,7 @@ extern struct dev_pm_domain omap_device_pm_domain;
  * @_dev_wakeup_lat_limit: dev wakeup latency limit in nsec - set by OMAP PM
  * @_state: one of OMAP_DEVICE_STATE_* (see above)
  * @flags: device flags
+ * @_driver_status: one of BUS_NOTIFY_*_DRIVER from <linux/device.h>
  *
  * Integrates omap_hwmod data into Linux platform_device.
  *
@@ -73,6 +74,7 @@ struct omap_device {
 	struct omap_device_pm_latency	*pm_lats;
 	u32				dev_wakeup_lat;
 	u32				_dev_wakeup_lat_limit;
+	unsigned long			_driver_status;
 	u8				pm_lats_cnt;
 	s8				pm_lat_level;
 	u8				hwmods_cnt;

arch/arm/plat-omap/omap_device.c

@@ -385,17 +385,21 @@ static int _omap_device_notifier_call(struct notifier_block *nb,
 				      unsigned long event, void *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
+	struct omap_device *od;
 
 	switch (event) {
-	case BUS_NOTIFY_ADD_DEVICE:
-		if (pdev->dev.of_node)
-			omap_device_build_from_dt(pdev);
-		break;
-
 	case BUS_NOTIFY_DEL_DEVICE:
 		if (pdev->archdata.od)
 			omap_device_delete(pdev->archdata.od);
 		break;
+	case BUS_NOTIFY_ADD_DEVICE:
+		if (pdev->dev.of_node)
+			omap_device_build_from_dt(pdev);
+		/* fall through */
+	default:
+		od = to_omap_device(pdev);
+		if (od)
+			od->_driver_status = event;
 	}
 
 	return NOTIFY_DONE;