> >> I guess UAC1 doesn't need feedback endpoints, right? Seems like that
> >> should be something specific to UAC2. At least for now.
> >
> > It seems like it is needed there aswell, see
> > http://www.usb.org/developers/docs/devclass_docs/audio10.pdf (
> > (Feedback endpoint == Synch Endpoint)
> fair enough, then it could be done generically in u_audio.c

Ok, but I guess for the generic case (when it is possible to calculate the 
feedback value) that lower levels need to provide f.i. the high resolution 
timestamps of SOF IRQs to upper levels ? In the ALSA subsystem case, the 
calculation is straightforward and static.

I don't know if you saw my proposal for a new UAC2 gadget upper level 
implementation, where the gadget should be exposed as a JACK client. In this 
case, there would be need for those SOF timestamps to be able to calculate the 
feedback value.

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