Re: [PATCH v3 1/1] pinctrl: add Intel BayTrail GPIO/pinctrl support

[Linus Walleij]

On Wed, Apr 23, 2014 at 5:14 PM, Timur Tabi <timur@xxxxxxxxxxxxxx> wrote:

> How are the pin muxes normally configured in ACPI?

VERY good question.

>  All of our GPIOs have a
> pinmux on them, and so if you want to use the pin for the non-default
> functionality, you need to configure the mux.  Isn't that supposed to happen
> with the through the pinctrl driver?  That is, when the kernel parses the
> ASL, and it seems a command to configure pin #3 to function #4, it calls the
> local pinctrl driver to do that?

Let's suspect this is true. That is how GPIO work after all is it not?

I guess the other option would be that all systems must come with a
tailored set-up written in ASL, specific for each board configuration.

Yours,
Linus Walleij
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