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| author | Sakari Ailus <sakari.ailus@linux.intel.com> | 2023-11-01 11:00:05 +0300 |
|---|---|---|
| committer | Hans Verkuil <hverkuil-cisco@xs4all.nl> | 2023-12-04 13:21:46 +0300 |
| commit | 6a6e49f89297cdf2c8c4deec54395179643b4a05 (patch) | |
| tree | 7f967323d59b8fe84bcfa52e0ced82b5bc0efd9a /Documentation/driver-api/media/v4l2-subdev.rst | |
| parent | 0e7f68fe16022fc424fc7244287fe23c7c2fe862 (diff) | |
| download | linux-6a6e49f89297cdf2c8c4deec54395179643b4a05.tar.xz | |
media: Documentation: Initialisation finishes before subdev registration
Document that sub-device initialisation needs to complete before the async
sub-device is registered as there is no further driver action needed
before the sensor becomes accessible via the UAPI.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Diffstat (limited to 'Documentation/driver-api/media/v4l2-subdev.rst')
| -rw-r--r-- | Documentation/driver-api/media/v4l2-subdev.rst | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/driver-api/media/v4l2-subdev.rst b/Documentation/driver-api/media/v4l2-subdev.rst index a62e4aff31be..1db2ba27c54c 100644 --- a/Documentation/driver-api/media/v4l2-subdev.rst +++ b/Documentation/driver-api/media/v4l2-subdev.rst @@ -181,6 +181,8 @@ You can unregister a sub-device using: Afterwards the subdev module can be unloaded and :c:type:`sd <v4l2_subdev>`->dev == ``NULL``. +.. _media-registering-async-subdevs: + Registering asynchronous sub-devices ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ @@ -195,6 +197,11 @@ performed using the :c:func:`v4l2_async_unregister_subdev` call. Subdevices registered this way are stored in a global list of subdevices, ready to be picked up by bridge drivers. +Drivers must complete all initialization of the sub-device before +registering it using :c:func:`v4l2_async_register_subdev`, including +enabling runtime PM. This is because the sub-device becomes accessible +as soon as it gets registered. + Asynchronous sub-device notifiers ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |