linux-kernel - Re: [RFC PATCH v2] pinctrl: add helper to expose pinctrl state in debugfs

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Date:   Mon, 11 Jan 2021 12:03:18 +0200
From:   Tony Lindgren <tony@...mide.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Drew Fustini <drew@...gleboard.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Pantelis Antoniou <pantelis.antoniou@...aro.org>,
        Pantelis Antoniou <pantelis.antoniou@...il.com>,
        Jason Kridner <jkridner@...gleboard.org>,
        Robert Nelson <robertcnelson@...gleboard.org>
Subject: Re: [RFC PATCH v2] pinctrl: add helper to expose pinctrl state in
 debugfs

Hi,

* Linus Walleij <linus.walleij@...aro.org> [210109 21:14]:
> On Sat, Jan 9, 2021 at 3:55 AM Drew Fustini <drew@...gleboard.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.

Makes sense to me too.

We may want to make it into a proper sysfs interface eventually to not
require debugfs be enabled in .config. But that's another set of patches,
certainly makes sense to first enable it for debugfs.

Regards,

Tony