Re: [RFC PATCH] i2c: at91: Fix pinmux after devm_gpiod_get() for bus recovery

On Wed, Apr 15, 2020 at 10:06:43AM +0300, Codrin Ciubotariu wrote:

devm_gpiod_get() usually calls gpio_request_enable() for non-strict pinmux
drivers. These puts the pins in GPIO mode, whithout notifying the pinctrl
driver. At this point, the I2C bus no longer owns the pins. To mux the
pins back to the I2C bus, we use the pinctrl driver to change the state
of the pins to GPIO, before using devm_gpiod_get(). After the pins are
received as GPIOs, we switch theer pinctrl state back to the default
one,

Fixes: d3d3fdcc4c90 ("i2c: at91: implement i2c bus recovery")
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>

Applied to for-current, thanks!

This will do for 5.7. For 5.8 or 5.9, I can imagine to take the two
pinctrl_state pointers into bus_recovery_info and handle all this in the
core. I will try this later this week if noone is super-eager to try it
out before.