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media: Documentation: v4l: Document missing async subdev function 

Also v4l2_async_nf_add_fwnode() may be used to add an async sub-device
descriptor to a notifier. Document this. Also remove a redundant sentence.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de> # imx6qp
Tested-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> # rcar + adv746x
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: Aishwarya Kothari <aishwarya.kothari@toradex.com> # Apalis i.MX6Q with TC358743
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> # Renesas RZ/G2L SMARC
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Sakari Ailus 2023-05-05 13:57:29 +02:00 committed by Mauro Carvalho Chehab
parent 4232c5df51
commit 95a188168b
1 changed files with 5 additions and 9 deletions
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14
Documentation/driver-api/media/v4l2-subdev.rst
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@ -206,15 +206,11 @@ takes two arguments: a pointer to struct :c:type:`v4l2_device` and a
pointer to struct :c:type:`v4l2_async_notifier`.
Before registering the notifier, bridge drivers must do two things: first, the
notifier must be initialized using the :c:func:`v4l2_async_nf_init`.
Second, bridge drivers can then begin to form a list of subdevice descriptors
that the bridge device needs for its operation. Several functions are available
to add subdevice descriptors to a notifier, depending on the type of device and
the needs of the driver.
:c:func:`v4l2_async_nf_add_fwnode_remote` and
:c:func:`v4l2_async_nf_add_i2c` are for bridge and ISP drivers for
registering their async sub-devices with the notifier.
notifier must be initialized using the :c:func:`v4l2_async_nf_init`. Second,
bridge drivers can then begin to form a list of subdevice descriptors that the
bridge device needs for its operation. :c:func:`v4l2_async_nf_add_fwnode`,
:c:func:`v4l2_async_nf_add_fwnode_remote` and :c:func:`v4l2_async_nf_add_i2c`
are available for that purpose.
Asynchronous sub-device registration helper for camera sensor drivers
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^