With a distribution block, my Meanwell 350W PSU supplies 12 volts to two DIN rails. Behind the CM3588s is a DIN rail with a 3D printed casing for the Shelly Slope 2 switch and the required WAGO connectors. I can then just plug them into the CM3588 barrel input from the Shelly switch. incredibly simp...

From your output of zgrep ROCKCHIP /proc/config.gz, we can see that Rockchip audio support (CONFIG_SND_SOC_ROCKCHIP=y) is enabled, but there is no mention of CONFIG_SND_SOC_HDMI_CODEC=m or CONFIG_SND_HDA_CODEC_HDMI, which could indicate that HDMI audio support (required for audio passthrough) might ...