This is Part 1 of the series “How to write your own CODEC driver” by Luo Zong (罗总), Rockchip.
PDM microphone capture on Rockchip platforms — the chip needs no control path; configure the DTS and it records. It exposes the capture PCM device pcmC0D0c.
The fully annotated English version is being prepared. In the meantime, read Part 2 — DAC Playback →