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From:   Dario Binacchi <dariobin@libero.it>
To:     linux-kernel@vger.kernel.org
Cc:     Dario Binacchi <dariobin@libero.it>,
        Tony Lindgren <tony@atomide.com>,
        Drew Fustini <drew@beagleboard.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        Haojian Zhuang <haojian.zhuang@linaro.org>,
        Jonathan Corbet <corbet@lwn.net>,
        linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org,
        linux-gpio@vger.kernel.org, linux-omap@vger.kernel.org
Subject: [PATCH v3 0/3] am335x: set pinmux registers from pins debug file
Date:   Thu, 20 May 2021 22:27:27 +0200
Message-Id: <20210520202730.4444-1-dariobin@libero.it>
Precedence: bulk


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.

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


Changes in v3:
- Use strncpy_from_user() instead of copy_from_user().
- Do not shadow the error code returned by kstrtouint().
- Change pin_dbg_set() interface (char *buf --> unsigned int val).
- Describe pin_dbg_set().
- Remove CONFIG_DEV_MEM dependency.
- Change pcs_pin_dbg_set() interface (char *buf -> unsigned int val).

Changes in v2:
- Remove CONFIG_SOC_AM33XX dependency.

Dario Binacchi (3):
  docs/pinctrl: update `pins' description under debugfs
  pinctrl: core: configure pinmux from pins debug file
  pinctrl: single: set pinmux from pins debug file

 Documentation/driver-api/pin-control.rst |  3 ++
 drivers/pinctrl/core.c                   | 63 +++++++++++++++++++++++-
 drivers/pinctrl/pinctrl-single.c         | 13 +++++
 include/linux/pinctrl/pinctrl.h          |  4 ++
 4 files changed, 81 insertions(+), 2 deletions(-)

-- 
2.17.1