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From:   Linus Walleij <linus.walleij@linaro.org>
Date:   Sat, 9 Jan 2021 22:14:37 +0100
Message-ID: <CACRpkdaOfU=OLp5D-EXK2oU9bScLZ-QjLdCSrewiSBa0SRRNwg@mail.gmail.com>
Subject: Re: [RFC PATCH v2] pinctrl: add helper to expose pinctrl state in debugfs
To:     Drew Fustini <drew@beagleboard.org>
Cc:     Andy Shevchenko <andy.shevchenko@gmail.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Pantelis Antoniou <pantelis.antoniou@konsulko.com>,
        Pantelis Antoniou <pantelis.antoniou@linaro.org>,
        Pantelis Antoniou <pantelis.antoniou@gmail.com>,
        Jason Kridner <jkridner@beagleboard.org>,
        Robert Nelson <robertcnelson@beagleboard.org>,
        Tony Lindgren <tony@atomide.com>
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On Sat, Jan 9, 2021 at 3:55 AM Drew Fustini <drew@beagleboard.org> wrote:

> I discussed my use case and this patch on #armlinux earlier this week
> and Alexandre Belloni suggested looking at the pinmux-pins debugfs file.

This sounds reasonable.

> This made me think that a possible solution could be to define a store
> function for pinmux-pins to handle something like "<pin#> <function#>".
> I believe the ability to activate a pin function (or pin group) from
> userspace would satisfy our beagleboard.org use-case.
>
> Does that seem like a reasonable approach?

This sounds like a good approach.

Yours,
Linus Walleij