[RFC 1/3] pinctrl: add a driver for NVIDIA Tegra

[tony@atomide.com (Tony Lindgren)]

* Linus Walleij <linus.walleij@linaro.org> [111209 15:17]:
> On Fri, Dec 9, 2011 at 6:07 PM, Tony Lindgren <tony@atomide.com> wrote:
> 
> > - We currently have hard time supporting pin groups with pins
> > ?coming from multiple pinmux driver instances
> 
> Pin groups are per definiton per-controller inctance. That is a
> given side effect of not having a global pin space.
> 
> But you can create two groups of the same name on two
> pin controllers so that e.g. pinctrl.0 and pinctrl.1 have
> a group named "foo", then map both to a certain device
> in the board pinmux map.
> 
> You will have to request them individually however, like
> with two hogs or two pinmux_get() calls specifying the
> name of each map, else you will just get the first one.
> 
> Not that I've tried it, but that's how it's supposed to work...

Yes a little bit of trickery is needed there, I'll look into
it more as we already have two controller instances on omap4.

Regards,

Tony