Well, this might not really help, still, there is always the possibility to access the peripheral directly from userland. Real-time behavior is feasible thru DMA access. If you need other CE/CS signals than the one controlled by the SPI peripheral you still can daisy chain DMA control blocks to acc...

After studying the source closer, I'm confident that the driver ignores SPI_NO_CS when using gpio chipselect. Anyone have any thoughts as to why this is or isn't a bug?

I'm not seeing any difference on how the chipselects operate when SPI_NO_CS is set/cleared. My intention is to configure the system to use GPIO chipselects. I need to leave the chipselect de-asserted for some transfers. I'm running Raspbian (March 2017 Jessie) on a Pi 2 Model B V. 1.1. # This is my ...