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 [thread overview]
Message-ID: <20210520202730.4444-1-dariobin@libero.it> (raw)
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
next reply other threads:[~2021-05-20 20:27 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-20 20:27 Dario Binacchi [this message]
2021-05-20 20:27 ` [PATCH v3 3/3] pinctrl: single: set pinmux from pins debug file Dario Binacchi
2021-05-21 6:44 ` Vladimir Zapolskiy
2021-05-25 0:18 ` [PATCH v3 0/3] am335x: set pinmux registers " Linus Walleij
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