On Tue, Jun 26, 2012 at 03:13:58AM +0800, Linus Walleij wrote:
> On Sat, Jun 23, 2012 at 8:29 PM, Mark Brown

> > +       regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
> > +                          ARIZONA_GPN_LVL, value);

> I'm guessing that regmap is caching, selectively updating volatile
> regs and marshalling the writes in the background.

It's just the standard read/modify/write operation (the same as you've
got for ab8500 IIRC).  As far as the immediate user is concerned it's
just doing the I/O, the API will work with cache or the hardware
depending on how the chip register map is configured.