[PATCH v2 1/2] pinctrl: add pinctrl_provide_dummies interface for platforms to use

[Linus Walleij]

On Wed, Apr 25, 2012 at 11:49 AM, Dong Aisheng
<aisheng.dong at freescale.com> wrote:
> On Wed, Apr 25, 2012 at 03:00:23AM +0800, Stephen Warren wrote:

>> The only thing that should be calling pinctrl_request_gpio() is a GPIO
>> driver. It should only be calling it for the GPIOs it manages. I'd
>> expect that if a platform's pinctrl driver was not yet written to
>> support the GPIO functionality, then the GPIO driver would not be
>> calling this function.
>>
> Hmm, pinctrl gpio is in the same situation as pinctrl state that gpio
> driver may be shared between several platforms, with pinctrl support
> or not.

I think it's mostly safe to assume that either:

- pinctrl calls from GPIO drivers gets stubbed out totally due to
  CONFIG_PINCTRL not being selected

or:

- You need to pass a token through platform data to the
  GPIO driver telling it whether it needs to request pins for
  it's GPIOs or not. Just a bool should work fine?

Linus Walleij