Re: [PATCH v2 1/2] pinctrl: renesas: Make sure the pin type is updated after setting the MUX

On 11/6/20 7:01 PM, Lad Prabhakar wrote:

By default on startup all the pin types are configured to PINMUX_TYPE_NONE (in sh_pfc_map_pins()), when pin is set as GPIO the pin type is updated to PINMUX_TYPE_GPIO. But the type is not updated when the pin is set as a function in sh_pfc_pinctrl_pin_set() or sh_pfc_pinctrl_group_set() calls (these calls only set the MUX if the pin type is PINMUX_TYPE_NONE ie unused).

So with the current implementation pin functionality could be overwritten silently, for example if the same pin is added for SPI and serial.

Shouldn't the pinctrl core rather warn about such a collision and abort?