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From FriendlyELEC WiKi
I2S support for NanoPi M4
We have tested 2ch, but not yet tested 8ch, need to check and modify the dts configuration:
arch/arm64/boot/dts/rockchip/rk3399-nanopi4-common.dtsi
arch/arm64/boot/dts/rockchip/rk3399-nanopi4-rev01.dts