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[media] v4l: Implement v4l2_subdev_link_validate()

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v4l2_subdev_link_validate() is the default op for validating a link. In V4L2
subdev context, it is used to call a pad op which performs the proper link
check without much extra work.

Signed-off-by: Sakari Ailus <[email protected]>
Acked-by: Laurent Pinchart <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
This commit is contained in:
Sakari Ailus 2011-10-10 17:01:25 -03:00 • committed by Mauro Carvalho Chehab
commit 8227c92b69
3 changed files with 88 additions and 0 deletions
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12
Documentation/video4linux/v4l2-framework.txt
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@ -316,6 +316,18 @@ If the subdev driver intends to process video and integrate with the media
framework, it must implement format related functionality using
v4l2_subdev_pad_ops instead of v4l2_subdev_video_ops.
In that case, the subdev driver may set the link_validate field to provide
its own link validation function. The link validation function is called for
every link in the pipeline where both of the ends of the links are V4L2
sub-devices. The driver is still responsible for validating the correctness
of the format configuration between sub-devices and video nodes.
If link_validate op is not set, the default function
v4l2_subdev_link_validate_default() is used instead. This function ensures
that width, height and the media bus pixel code are equal on both source and
sink of the link. Subdev drivers are also free to use this function to
perform the checks mentioned above in addition to their own checks.
A device (bridge) driver needs to register the v4l2_subdev with the
v4l2_device: