linux-kernel - Re: [PATCH v2 0/2] am335x: set pinmux registers from pins debug file

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Message-ID: <CAHp75Vc0kmwuT21=bvpfUj+qAO1XmKEXUpxEEhx3TRZrQbR4Gw@mail.gmail.com>
Date:   Wed, 19 May 2021 14:31:37 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Dario Binacchi <dariobin@...ero.it>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Haojian Zhuang <haojian.zhuang@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Tony Lindgren <tony@...mide.com>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux OMAP Mailing List <linux-omap@...r.kernel.org>
Subject: Re: [PATCH v2 0/2] am335x: set pinmux registers from pins debug file

On Wed, May 19, 2021 at 3:58 AM Dario Binacchi <dariobin@...ero.it> wrote:
>
>
> The patch was born from the need to change the slew rate of the LCD pins
> of a custom AM335x board during EMC tests. The AM335x, as described in a
> note in section 9.1 of its reference manual [1], is unable to write
> pinmux registers from user space. The series now makes it possible to
> write these registers from the pins debug file.

Even for debugfs it would be nice to have a piece of documentation.
Because pin control is a quite sensitive area and if something goes
wrong, it may damage the hardware.

> [1] https://www.ti.com/lit/ug/spruh73q/spruh73q.pdf


-- 
With Best Regards,
Andy Shevchenko