SPI1 no clock on SCL pin

#1

Good day,

i have a problem with Rock Pi S. I am using SPI1 in the project for communication and need two CS lines with pin definition. I made my own overlay somewhere I had to use the definition: cs-gpios = <0>, <&gpio2 0x04 0x00>; I found that this doesn’t work in the official 4.4 kernel. I tried using the latest armbian and also the latest debian b40 release here: https://github.com/radxa-build/rock-pi-s/releases/tag/b40. I found that although the two CS pins start working, there is no clock signal present on the SCL pin when communicating. Can you please advise him?

Thank you

#2

@Martin_Petrasovsky

I used the rockpis_debian_buster_server_arm64_20210924_0412-gpt.img.gz

with /boot/uEnv.txt

verbosity=7
fdtfile=rockchip/rk3308-rock-pi-s.dtb
overlays=rk3308-spi-spidev  rk3308-i2c2
param_spidev_spi_bus=2
param_spidev_max_freq=10000000
rootuuid=2a975457-7408-4fda-bd37-22b8d2df5b6f
initrdsize=0x5caa89
kernelversion=4.4.143-69-rockchip-g8ccef796d27d
initrdimg=initrd.img-4.4.143-69-rockchip-g8ccef796d27d
kernelimg=vmlinuz-4.4.143-69-rockchip-g8ccef796d27d

import spidev
spi = spidev.SpiDev()
spi.open(2, 0)
spi.max_speed_hz = 10000000
to_send = [0x01, 0x02, 0x03]
spi.xfer(to_send)

and SPI works perfectly