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[v3,0/3] am335x: set pinmux registers from pins debug file

Message ID 20210520202730.4444-1-dariobin@libero.it
Headers show
Series am335x: set pinmux registers from pins debug file | expand


Dario Binacchi May 20, 2021, 8:27 p.m. UTC
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(-)