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find a big problem with it other than it brings the entire IIO
subsystem along, including the userspace interfaces I guess.

The circumstances seem to suggest that drivers/iio/adc should
be moved down to drivers/adc without the rest of the iio
stuff, with a in-kernel API only and then have iio use that
(this is probably true for some more drivers in IIO like
dac, accel, addac, gyro...).

So the concept of IIO stuff would change from the
userspace-first centric view to the kernelspace-first
centric, with optional userspace interfaces in the form
of IIO.

I'm not sure about what Jonathan thinks about that
though.

Yours,
Linus Walleij