[media] v4l2-subdev.h: add g_tvnorms video op

While there was already a g_tvnorms_output video op, it's counterpart for
video capture was missing. Add it.

This is necessary for generic bridge drivers like soc-camera to set the
video_device tvnorms field correctly. Otherwise ENUMSTD cannot work.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

include/media/v4l2-subdev.h

@@ -272,8 +272,11 @@ struct v4l2_mbus_frame_desc {
    g_std_output: get current standard for video OUTPUT devices. This is ignored
 	by video input devices.
 
-   g_tvnorms_output: get v4l2_std_id with all standards supported by video
-	OUTPUT device. This is ignored by video input devices.
+   g_tvnorms: get v4l2_std_id with all standards supported by the video
+	CAPTURE device. This is ignored by video output devices.
+
+   g_tvnorms_output: get v4l2_std_id with all standards supported by the video
+	OUTPUT device. This is ignored by video capture devices.
 
    s_crystal_freq: sets the frequency of the crystal used to generate the
 	clocks in Hz. An extra flags field allows device specific configuration
@@ -316,6 +319,7 @@ struct v4l2_subdev_video_ops {
 	int (*s_std_output)(struct v4l2_subdev *sd, v4l2_std_id std);
 	int (*g_std_output)(struct v4l2_subdev *sd, v4l2_std_id *std);
 	int (*querystd)(struct v4l2_subdev *sd, v4l2_std_id *std);
+	int (*g_tvnorms)(struct v4l2_subdev *sd, v4l2_std_id *std);
 	int (*g_tvnorms_output)(struct v4l2_subdev *sd, v4l2_std_id *std);
 	int (*g_input_status)(struct v4l2_subdev *sd, u32 *status);
 	int (*s_stream)(struct v4l2_subdev *sd, int enable);