[PATCH v2 0/2] am335x: set pinmux registers from pins debug file · Dario Binacchi <hidden> · 2021-05-17
[PATCH v2 1/2] pinctrl: core: configure pinmux from pins debug file · Dario Binacchi <hidden> · 2021-05-17
Re: [PATCH v2 1/2] pinctrl: core: configure pinmux from pins debug file · Andy Shevchenko <hidden> · 2021-05-19
[PATCH v2 2/2] pinctrl: single: set pinmux from pins debug file · Dario Binacchi <hidden> · 2021-05-17
Re: [PATCH v2 2/2] pinctrl: single: set pinmux from pins debug file · Tony Lindgren <tony@atomide.com> · 2021-05-18
Re: [PATCH v2 2/2] pinctrl: single: set pinmux from pins debug file · Dario Binacchi <hidden> · 2021-05-18
Re: [PATCH v2 2/2] pinctrl: single: set pinmux from pins debug file · Tony Lindgren <tony@atomide.com> · 2021-05-21
Re: [PATCH v2 0/2] am335x: set pinmux registers from pins debug file · Andy Shevchenko <hidden> · 2021-05-19

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

From: Andy Shevchenko <hidden>
Date: 2021-05-19 11:31:58
Also in: linux-arm-kernel, linux-omap, lkml

On Wed, May 19, 2021 at 3:58 AM Dario Binacchi [off-list ref] 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

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