linux-kernel - Re: [PATCH] pinctrl: msm: Use dynamic GPIO numbering

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Message-ID: <CACRpkdZ2UzA=Hyw+b20dCqzu8+L7_D1bTM44MKbbue2VFCY4UQ@mail.gmail.com>
Date:   Thu, 5 Nov 2020 11:16:17 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Arun KS <arunks.linux@...il.com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        MSM <linux-arm-msm@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Timur Tabi <timur@...eaurora.org>,
        Arun KS <getarunks@...il.com>
Subject: Re: [PATCH] pinctrl: msm: Use dynamic GPIO numbering

On Fri, Oct 23, 2020 at 4:21 PM Arun KS <arunks.linux@...il.com> wrote:

> Im only concerned because, after this change, the use of gpio number
> from user space has become a little difficult.

This makes me a bit puzzled so I need to push back a bit
here.

What is this userspace and what interface is it using?

We recommend using the GPIO character device with
libgpiod for userspace applications:
https://www.kernel.org/doc/html/latest/driver-api/gpio/using-gpio.html

Is there any problem with this?

sysfs is deprecated for years now:
https://www.kernel.org/doc/html/latest/admin-guide/gpio/sysfs.html

Yours,
Linus Walleij