[media] V4L2: add a device pointer to struct v4l2_subdev

It is often useful to have simple means to get from a subdevice to the
underlying physical device. This patch adds such a pointer to struct
v4l2_subdev and sets it accordingly in the I2C and SPI cases.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 21fc9e16d7be..5fbb266405f9 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -583,6 +583,8 @@ struct v4l2_subdev {
         void *host_priv;
         /* subdev device node */
         struct video_device *devnode;
+        /* pointer to the physical device, if any */
+        struct device *dev;
 };
 
 #define media_entity_to_v4l2_subdev(ent) \