JaJ IMU Test Script Not Working

[AlexKlimaj]

In the latest Jetpack and or ARK OS, the icm42688p test script is not working. Unable to probe the WHOAMI register.

[AlexKlimaj]

I was able to get it working by enabling the SPI3 interface in the Jetson IO tool. It looks like SPI1 board labeling is mapped to SPI3 in Jetpack 6.

sudo /opt/nvidia/jetson-io/jetson-io.py
Configure Jetson 40pin Header
Configure header pins manually
 [*] spi3           (13,16,18,22,37)

We should bake this into the device tree by default since it is hard wired on the board.

[AlexKlimaj]

Attempted to get it working by default without jetson-io but this didn't work.
https://github.com/ARK-Electronics/ark_jetson_kernel/tree/pr-jaj-fix-spi-pinmux