From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@kernel.org>
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
	aws-us-west-2-korg-lkml-1.web.codeaurora.org
X-Spam-Level: 
X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00,
	HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,
	URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0
Received: from mail.kernel.org (mail.kernel.org [198.145.29.99])
	by smtp.lore.kernel.org (Postfix) with ESMTP id 0C8C3C433DB
	for <linux-kernel@archiver.kernel.org>; Mon, 11 Jan 2021 10:04:05 +0000 (UTC)
Received: from vger.kernel.org (vger.kernel.org [23.128.96.18])
	by mail.kernel.org (Postfix) with ESMTP id B88F3221F0
	for <linux-kernel@archiver.kernel.org>; Mon, 11 Jan 2021 10:04:04 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1728700AbhAKKEE (ORCPT
        <rfc822;linux-kernel@archiver.kernel.org>);
        Mon, 11 Jan 2021 05:04:04 -0500
Received: from muru.com ([72.249.23.125]:42728 "EHLO muru.com"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S1728527AbhAKKEE (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
        Mon, 11 Jan 2021 05:04:04 -0500
Received: from atomide.com (localhost [127.0.0.1])
        by muru.com (Postfix) with ESMTPS id 6516C80BB;
        Mon, 11 Jan 2021 10:03:22 +0000 (UTC)
Date:   Mon, 11 Jan 2021 12:03:18 +0200
From:   Tony Lindgren <tony@atomide.com>
To:     Linus Walleij <linus.walleij@linaro.org>
Cc:     Drew Fustini <drew@beagleboard.org>,
        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>
Subject: Re: [RFC PATCH v2] pinctrl: add helper to expose pinctrl state in
 debugfs
Message-ID: <X/wiZjioLqcTYVfj@atomide.com>
References: <20201218045134.4158709-1-drew@beagleboard.org>
 <CAHp75Vfwb+f3k2+mAj+jB=XsKFX-hCxx61A_PCmwz6y-YKHMcg@mail.gmail.com>
 <20201224203603.GA59600@x1>
 <CACRpkdb9RnGJbct+D-88JPDSbaVp1XS8vjhhHYosy20EPkLjaw@mail.gmail.com>
 <20210109025527.GA2918377@x1>
 <CACRpkdaOfU=OLp5D-EXK2oU9bScLZ-QjLdCSrewiSBa0SRRNwg@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CACRpkdaOfU=OLp5D-EXK2oU9bScLZ-QjLdCSrewiSBa0SRRNwg@mail.gmail.com>
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Hi,

* Linus Walleij <linus.walleij@linaro.org> [210109 21:14]:
> 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.

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