On Wed, Jan 06, 2021 at 12:17:01PM -0800, Tim Harvey wrote: > On Wed, Jan 6, 2021 at 3:21 AM Johan Hovold <johan@xxxxxxxxxx> wrote: > > Correct, there are currently no drivers supporting SPI and hence no > > shared implementation either like there is for UART interfaces. > > > > The driver for your device would need to handle the SPI bits itself for > > now. What kind of device is it? > It is the u-blox ZOE-M8Q which has a UART as well as SPI/I2C/SQI > interface. The particular board design we are working on is > unfortunately out of UART's which is why we were looking at connecting > it via SPI. So we'd need to add support for the SPI interface to the ublox driver, which is currently UART only. > I did come across a posting about this [1] which uses a userspace app > that creates a spy to pty bridge but it seems like they ran into some > performance/latency issues. Yeah, that is one of the problems that the gnss subsystem is meant to solve; to handle the transport interface in the kernel and provide a generic interface to user space. Johan
