On Wed, Jan 6, 2021 at 3:21 AM Johan Hovold <johan@xxxxxxxxxx> wrote: > > On Tue, Jan 05, 2021 at 10:23:43AM -0800, Tim Harvey wrote: > > Johan, > > > > I have noticed you maintain a gnss receiver subsystem and according to > > the device-tree binding Documentation it looks like it supports SPI > > but I'm not seeing any code support for SPI. Am I missing something or > > would that support need to be added for use? > > 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? Johan, 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. 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. Tim [1] https://portal.u-blox.com/s/question/0D52p00008jOh43CAC/using-neo-m8p-over-spi-as-a-high-accuracy-time-source-with-chrony
