Rock 5A i2c on gpio pin issue

[cyrili]

could this issue be related to insufficient pull-up resistor on SDA as observed by this post?

Rock 5A no I2C or UART output

Welp, you’re not the only one. First, there’s no V1.2 that I know of. Your V1.1 is similar to X1.2, so if you were looking at X1.1 pinout on wiki and thinking that it’s correct for you — well, it’s not… Try actually referring to X1.2 pinout instead. So, pins 3 and 5 on your V1.1 are, in fact, I2C8_M2. That said, there’s one more issue: the schematics available for download (and the info on wiki) is wrong, as there’s pull up on SCL but NOT on SDA for I2C8.

@Bin may i ask how you managed to reduce the clock speed?

edit:
to change clock speed to e.g. 10000:
cd /usr/lib/linux-image-5.10.110-12-rockchip/rockchip
sudo fdtput --type u rk3588s-rock-5a.dtb i2c8 clock-frequency 10000
sudo reboot