diff options
| author | Jacopo Mondi <jacopo@jmondi.org> | 2020-05-07 17:12:49 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-05-12 17:03:26 +0200 |
| commit | 3fb0ee8b3b79ee9c8fb7769bdf802bffeae7e085 (patch) | |
| tree | ed1520460313915b3c985600613d5fee113e1507 /Documentation/userspace-api/media/v4l/dev-subdev.rst | |
| parent | 18200e9e243d9095be953cf09cba29f9b3b5f262 (diff) | |
media: Documentation: media: Document read-only subdevice
Document a new kAPI function to register subdev device nodes in read only
mode and for each affected ioctl report how access is restricted.
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'Documentation/userspace-api/media/v4l/dev-subdev.rst')
| -rw-r--r-- | Documentation/userspace-api/media/v4l/dev-subdev.rst | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/userspace-api/media/v4l/dev-subdev.rst b/Documentation/userspace-api/media/v4l/dev-subdev.rst index 0c1a5f50ee21..134d2fb909fa 100644 --- a/Documentation/userspace-api/media/v4l/dev-subdev.rst +++ b/Documentation/userspace-api/media/v4l/dev-subdev.rst @@ -39,6 +39,11 @@ will feature a character device node on which ioctls can be called to Sub-device character device nodes, conventionally named ``/dev/v4l-subdev*``, use major number 81. +Drivers may opt to limit the sub-device character devices to only expose +operations that do not modify the device state. In such a case the sub-devices +are referred to as ``read-only`` in the rest of this documentation, and the +related restrictions are documented in individual ioctls. + Controls ======== |