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media: v4l2-async: Create links during v4l2_async_match_notify()
Upon an async fwnode match, there's some typical behaviour that the notifier and matching subdev will want to do. For example, a notifier representing a sensor matching to an async subdev representing its VCM will want to create an ancillary link to expose that relationship to userspace. To avoid lots of code in individual drivers, try to build these links within v4l2 core. Signed-off-by: Daniel Scally <djrscally@gmail.com>
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