How to enable SPI2 interface

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Xavier
,
16

Hi ShaneCCC,

Thank you very much for your support. Following your guide and multiple other sources, I have been able to see the /dev/spidev1.0 on the NVIDIA carrier board, but when I use our own custom carrier board, it disappears.

I noticed that I can update the device tree with the following steps:

  • cd /boot/dtb
  • sudo dtc -I dtb -O dts -o extracted_proc.dts tegra194-p2888-0001-p2822-0000.dtb
    This command decompiles the dtb, instead of fs as I previously did.
  • Edit the file extracted_proc.dts . We identified spi1 = “/spi@c260000” and made the following changes.
spi@c260000 {
...
        status = "okay";
        ...
        spidev@1 {
                compatible = "spidev";
                reg = <0>;
                spi-max-frequency=<25000000>;
        };
};

There is a child node related to imx204@0 which I did not edit.

  • Use the flash.sh to reflash the kernel dtb.

Do you know if there are required hardware changes for the SPI2 to work on our own custom board?

EDIT: The outlined steps seem to work. I am not sure why I didn’t see the SPI before. I just rebooted the board and voila, it works!