[PATCH v4 23/29] media: Improve enable_streams and disable_streams documentation

Sakari Ailus
2026-04-08T15:40:24Z

Document that enable_streams may start additional streams and
disable_streams may not disable requested streams if other related streams
are still enabled.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Mirela Rabulea <mirela.rabulea@nxp.com>
---
include/media/v4l2-subdev.h | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index d256b7ec8f84..4588992b4417 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -814,6 +814,10 @@ struct v4l2_subdev_state {
* V4L2_SUBDEV_CAP_STREAMS sub-device capability flag can ignore the mask
* argument.
*
+ * Starting the requested streams may require starting additional
+ * streams. Streams that are started together due to hardware are called a
+ * stream group.
+ *
* @disable_streams: Disable the streams defined in streams_mask on the given
* source pad. Subdevs that implement this operation must use the active
* state management provided by the subdev core (enabled through a call to
@@ -823,6 +827,9 @@ struct v4l2_subdev_state {
* Drivers that support only a single stream without setting the
* V4L2_SUBDEV_CAP_STREAMS sub-device capability flag can ignore the mask
* argument.
+ *
+ * A stream group is disabled when one or more streams in the stream
+ * group are disabled.
*/
struct v4l2_subdev_pad_ops {
int (*enum_mbus_code)(struct v4l2_subdev *sd,
--
2.47.3