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Date: Thu, 24 Apr 2014 00:20:12 +0200
Message-ID: <CACRpkdbk8okbzaZgD=BqeMSOvbEvYNViqamd9i=NAaAWW=T9sQ@mail.gmail.com>
Subject: Re: [PATCH v3 1/1] pinctrl: add Intel BayTrail GPIO/pinctrl support
From: Linus Walleij <linus.walleij@linaro.org>
To: Timur Tabi <timur@codeaurora.org>
Cc: "Westerberg, Mika" <mika.westerberg@intel.com>,
        Mathias Nyman <mathias.nyman@linux.intel.com>,
        Grant Likely <grant.likely@secretlab.ca>,
        lkml <linux-kernel@vger.kernel.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
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Sender: linux-kernel-owner@vger.kernel.org

On Wed, Apr 23, 2014 at 5:14 PM, Timur Tabi <timur@codeaurora.org> 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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