On Tue, Sep 1, 2015 at 3:19 PM, Chris Read <chris...@gmail.com> wrote:

> That sounds quite workable to me.  It might get more complicated
> than I'd prefer, especially if there are more things than GPIOs (such
> as ADCs, DACs, etc.)

What do you mean by this? We have in-kernel support for ADC and
DAC, see drivers/iio/[adc|dac] and these have excellent userspace
interfaces.

Yours,
Linus Walleij
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