[media] media-device.h: document the last functions

[linux-drm-fsl-dcu.git] / include / media / media-device.h

diff --git a/include/media/media-device.h b/include/media/media-device.h
index 215a0d88241d46bd4917142e8ace6dc3c960398f..ebc2f3a239eb09a6298d057ddf66185d921acf13 100644 (file)
--- a/include/media/media-device.h
+++ b/include/media/media-device.h
@@ -449,7 +449,29 @@ int __must_check media_device_register_entity(struct media_device *mdev,
  * the driver if required.
  */
 void media_device_unregister_entity(struct media_entity *entity);
+
+/**
+ * media_device_get_devres() - get media device as device resource
+ *                             creates if one doesn't exist
+ *
+ * @dev: pointer to struct &device.
+ *
+ * Sometimes, the media controller &media_device needs to be shared by more
+ * than one driver. This function adds support for that, by dynamically
+ * allocating the &media_device and allowing it to be obtained from the
+ * struct &device associated with the common device where all sub-device
+ * components belong. So, for example, on an USB device with multiple
+ * interfaces, each interface may be handled by a separate per-interface
+ * drivers. While each interface have its own &device, they all share a
+ * common &device associated with the hole USB device.
+ */
 struct media_device *media_device_get_devres(struct device *dev);
+
+/**
+ * media_device_find_devres() - find media device as device resource
+ *
+ * @dev: pointer to struct &device.
+ */
 struct media_device *media_device_find_devres(struct device *dev);
 
 /* Iterate over all entities. */