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>

2 files changed, 11 insertions, 5 deletions

diff --git a/arch/arm/plat-omap/include/plat/omap_device.h b/arch/arm/plat-omap/include/plat/omap_device.h
index 4327b2c90c3d..e7259c0d33ec 100644
--- a/arch/arm/plat-omap/include/plat/omap_device.h
+++ b/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;
diff --git a/arch/arm/plat-omap/omap_device.c b/arch/arm/plat-omap/omap_device.c
index c490240bb82c..1d1b5ff78306 100644
--- a/arch/arm/plat-omap/omap_device.c
+++ b/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;