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@@ -340,6 +340,12 @@ Make sure to call v4l2_device_unregister_subdev(sd) when the remove() callback
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is called. This will unregister the sub-device from the bridge driver. It is
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safe to call this even if the sub-device was never registered.
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+You need to do this because when the bridge driver destroys the i2c adapter
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+the remove() callbacks are called of the i2c devices on that adapter.
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+After that the corresponding v4l2_subdev structures are invalid, so they
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+have to be unregistered first. Calling v4l2_device_unregister_subdev(sd)
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+from the remove() callback ensures that this is always done correctly.
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+
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The bridge driver also has some helper functions it can use:
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Hans Verkuil