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
