On Thu, Nov 06, 2014 at 12:02:49AM +0400, Dmitry Eremin-Solenikov wrote:
> 2014-11-03 16:41 GMT+03:00 Linus Walleij <linus.walleij@linaro.org>:

> > The point is still the same: no unrelated code in drivers/mfd,
> > then either use IIO DAC as a middle layer or sink the DAC handling
> > into respective subdriver, i.e. push it into the backlight or
> > volume directly then.

> The problem is that the DAC is equally used by backlight and by sound
> device (WIP).
> What about true i2c device driver sitting in drivers/misc and exporting a regmap
> of 2 8-bit registers?

If it can just export registers that sounds like a MFD.  If it needs to
export functionality then like Linus says the IIO subsystem abstracts
DACs.