SPI on rock s0

[grixm]

Hi guys, I got a SPIdev overlay to work on the rock S0, figured I'd just share it here for the record, since I could have used this info myself (I spent days trying to figure it out since I had no experience with device trees or whatnot).

 

Basically, download the attached .dts file, then run

sudo armbian-add-overlay rk3308-spi2-spidev.dts

I also edited /boot/armbianEnv.txt and added this line, but I'm unsure if that's actually necessary?

param_spidev_spi_bus=2

 

This worked on Armbian 24.5.1 Noble, creating /dev/spidev2.0. You can verify that it works using this tool: https://github.com/rm-hull/spidev-test

The dts file is based on this one from radxa, however changed to "fragment@" syntax like other armbian overlays: https://github.com/radxa-pkg/radxa-overlays/blob/main/arch/arm64/boot/dts/rockchip/overlays/rk3308-spi2-spidev.dts

Maybe this will also work on Rock Pi S, but haven't tested.

 

 

rk3308-spi2-spidev.dts

Edited August 3, 2024 by grixm

[grixm]

And here is one for SPI1: rk3308-spi1-spidev.dts

[Meestor_X]

Interesting that you were able to get the overlay to work on Noble. Cannot get any overlay to work on bookworm 24.11.1...

[Meestor_X]

Do you happen to know if the S0 has an ADC input?

 

(Got the overlays working finally)

Edited January 6 by Meestor_X

[grixm]

No I don't think it has ADC. But you can use the numerous SPI or i2c ports to connect an external adc.

Edited January 7 by grixm

[eselarm]

The SoC has an ADC AFAIR, but it is used for 'Recovery Key' AFAIR. Look in Radxa PCB schematics to be sure.

[Meestor_X]

Ty.

I picked up a cheap sda1115 ADC which uses I2C.

Will i2c on the Rock-S0 need an overlay or is it already enabled by default in armbian. Haven't figured out how to test for that yet.

 

NM - it "just works", I didn't have to change anything or add an overlay! 🙂

Edited January 19 by Meestor_X