On Mon, May 17, 2021 at 09:28:04PM +0200, Sander Vanheule wrote: > GPIO chips may not support setting the output value when a pin is > configured as an input Could you describe what happens with the hardware you are playing with. Not being able to do this means you will get glitches when enabling the output so you should not use these GPIOs with bit banging busses like i2c. Andrew