[UPSTREAM] Attempt at improving ADC access

[Werner Almesberger]

Balaji Rao wrote:
> Sounds good. But in this case we still won't have an adc_request
> object within adc_sync_read to read the adc result from. And there is no
> other way we can get back the result. Isn't it ? :)

Hmm, good point, the result ... you could pass a pointer to a suitable
struct instead of just the completion. Not sure if that would be much
nicer in the end, though.

Ah well, it's pretty good already :-)

- Werner