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media: Documentation: media: Document read-only subdevice

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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>
This commit is contained in:
Jacopo Mondi
2020-05-07 17:12:49 +02:00
committed by Mauro Carvalho Chehab
parent 18200e9e24
commit 3fb0ee8b3b
8 changed files with 94 additions and 0 deletions
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5
Documentation/userspace-api/media/v4l/dev-subdev.rst
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@@ -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
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