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media: v4l2-subdev: document controls need _FL_HAS_DEVNODE

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Control events can be subscribed and received by the user. Therefore
drivers that support controls must expose the
V4L2_SUBDEV_FL_HAS_EVENTS flag.

[As discussed in https://lkml.org/lkml/2018/11/27/637]

Reported-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Luca Ceresoli 2018-12-05 11:55:37 -05:00 committed by Mauro Carvalho Chehab
parent be7e3c3684
commit d138091ffc
1 changed files with 5 additions and 1 deletions
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6
include/media/v4l2-subdev.h
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@ -776,7 +776,11 @@ struct v4l2_subdev_internal_ops {
#define V4L2_SUBDEV_FL_IS_SPI (1U << 1) #define V4L2_SUBDEV_FL_IS_SPI (1U << 1)
/* Set this flag if this subdev needs a device node. */ /* Set this flag if this subdev needs a device node. */
#define V4L2_SUBDEV_FL_HAS_DEVNODE (1U << 2) #define V4L2_SUBDEV_FL_HAS_DEVNODE (1U << 2)
/* Set this flag if this subdev generates events. */ /*
* Set this flag if this subdev generates events.
* Note controls can send events, thus drivers exposing controls
* should set this flag.
*/
#define V4L2_SUBDEV_FL_HAS_EVENTS (1U << 3) #define V4L2_SUBDEV_FL_HAS_EVENTS (1U << 3)
struct regulator_bulk_data; struct regulator_bulk_data;