Hi Mauro,

I'm working on adding proper compliance tests for the MC but I think something
is missing in the G_TOPOLOGY ioctl w.r.t. pads.

In several v4l-subdev ioctls you need to pass the pad. There the pad is an index
for the corresponding entity. I.e. an entity has 3 pads, so the pad argument is

The G_TOPOLOGY ioctl returns a pad ID, which is > 0x01000000. I can't use that
in the v4l-subdev ioctls, so how do I translate that to a pad index in my 

It seems to be a missing feature in the API. I assume this information is 
in the core, so then I would add a field to struct media_v2_pad with the pad 
for the entity.

Next time we add new public API features I want to see compliance tests before
accepting it. It's much too easy to overlook something, either in the design or
in a driver or in the documentation, so this is really, really needed IMHO.



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