I've tried two releases of Armbian for the Jetson Nano and was struggling to get SPI enabled on the Jetson. To check if SPI is enabled, I've been reading its status is through: cat /proc/device-tree/spi@7000d400/status which just returns disabled
Here's what I tried:
- enabling spi-spidev through armbian-config, but this option doesn't exist in armbian-config as it does for other releases for devices
- making a custom device tree dts file and pointing extlinux.conf to it (below is the relevant snippet):
spi@7000d400 {
compatible = "nvidia,tegra210-spi\0nvidia,tegra114-spi";
reg = <0x00 0x7000d400 0x00 0x200>;
interrupts = <0x00 0x3b 0x04>;
#address-cells = <0x01>;
#size-cells = <0x00>;
clocks = <0x03 0x29>;
clock-names = "spi";
resets = <0x03 0x29>;
reset-names = "spi";
dmas = <0x24 0x0f 0x24 0x0f>;
dma-names = "rx\0tx";
status = "okay";
num-chipselects = <5>;
cs-gpios = <0x22 0x13 0>, <0x22 0x14 0>, <0x22 0x95 0>, <0x22 0xc8 0>, <0x22 0x26 0>;
spidev@0 {
compatible = "spidev";
reg = <0>;
spi-max-frequency = <0x1f78a40>;
status = "okay";
};
spidev@1 {
compatible = "spidev";
reg = <1>;
spi-max-frequency = <0x1f78a40>;
status = "okay";
};
spidev@2 {
compatible = "spidev";
reg = <2>;
spi-max-frequency = <0x1f78a40>;
status = "okay";
};
spidev@3 {
compatible = "spidev";
reg = <3>;
spi-max-frequency = <0x1f78a40>;
status = "okay";
};
spidev@4 {
compatible = "spidev";
reg = <4>;
spi-max-frequency = <0x1f78a40>;
status = "okay";
};
};
- looking at device tree overlays as explained here (https://docs.armbian.com/User-Guide_Allwinner_overlays/#using-custom-overlays) but armbian-add-overlay doesn't exist and there is no /boot/dtb/nvidia/overlay/ folder
