2 files changed, 21 insertions, 4 deletions

diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt
index e831aaca66f..f5fdb395287 100644
--- a/Documentation/video4linux/v4l2-framework.txt
+++ b/Documentation/video4linux/v4l2-framework.txt
@@ -192,6 +192,11 @@ You also need a way to go from the low-level struct to v4l2_subdev. For the
 common i2c_client struct the i2c_set_clientdata() call is used to store a
 v4l2_subdev pointer, for other busses you may have to use other methods.
 
+Bridges might also need to store per-subdev private data, such as a pointer to
+bridge-specific per-subdev private data. The v4l2_subdev structure provides
+host private data for that purpose that can be accessed with
+v4l2_get_subdev_hostdata() and v4l2_set_subdev_hostdata().
+
 From the bridge driver perspective you load the sub-device module and somehow
 obtain the v4l2_subdev pointer. For i2c devices this is easy: you call
 i2c_get_clientdata(). For other busses something similar needs to be done.
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 905879d7742..b0316a7cf08 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -438,17 +438,28 @@ struct v4l2_subdev {
         /* can be used to group similar subdevs, value is driver-specific */
         u32 grp_id;
         /* pointer to private data */
-        void *priv;
+        void *dev_priv;
+        void *host_priv;
 };
 
 static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p)
 {
-        sd->priv = p;
+        sd->dev_priv = p;
 }
 
 static inline void *v4l2_get_subdevdata(const struct v4l2_subdev *sd)
 {
-        return sd->priv;
+        return sd->dev_priv;
+}
+
+static inline void v4l2_set_subdev_hostdata(struct v4l2_subdev *sd, void *p)
+{
+        sd->host_priv = p;
+}
+
+static inline void *v4l2_get_subdev_hostdata(const struct v4l2_subdev *sd)
+{
+        return sd->host_priv;
 }
 
 static inline void v4l2_subdev_init(struct v4l2_subdev *sd,
@@ -462,7 +473,8 @@ static inline void v4l2_subdev_init(struct v4l2_subdev *sd,
         sd->flags = 0;
         sd->name[0] = '\0';
         sd->grp_id = 0;
-        sd->priv = NULL;
+        sd->dev_priv = NULL;
+        sd->host_priv = NULL;
 }
 
 /* Call an ops of a v4l2_subdev, doing the right checks against