stm32mp1 unused pins configure as gpio

[Ara.1]

Hi I have list of unused pins need to configure as a GPIO, and some as a AF's, do we have any driver which shall facilated unused pins by default set pins state., we have in imx6 IOMUX which does that job in kernel., in mp1 i didnt find that.

[PatrickF · Accepted solution]

Hi,

there is no need to declare 'unused' GPIOs, they are all by default assigned by the HW as Analog mode (See GPIOx_MODER in product Reference Manual), which is best for power consumption and noise.

Then, using Device Tree you could map required IOs to peripheral functions or GPIO function (e.g. LEDs).

Initialization of GPIO IP is done either on uBoot/Linux side (for IOs devoted to uBoot/Linux) or Cortex-M4 side (for IOs handled by m4_rproc).

See https://wiki.st.com/stm32mpu/wiki/Overview_of_GPIO_pins

https://wiki.st.com/stm32mpu/wiki/GPIO_device_tree_configuration

https://wiki.st.com/stm32mpu/wiki/How_to_assign_an_internal_peripheral_to_a_runtime_context

Regards.

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