What you are trying to do - using a single CS line as an A/B selector - is an abuse of the SPI protocol, and Linux SPI subsystem is not set up to work that way. I think you're going to have to find a spare GPIO somewhere and make that your second CS line. The only other option I can think of would be creating a virtual GPIO so that the driver thinks it is doing something but in practice it is going nowhere. There is a driver that could do that for your - gpio-fsm. It is described here: viewtopic.php?t=304278
Statistics: Posted by PhilE — Wed Oct 30, 2024 9:18 am