You want to favourite this toot:
For the curious ones, kernel diff https://github.com/Darkglass-Electronics/radxa-kernel/commit/1c99fb0a7788811a4eb212c3c0bdcb64dc9d955f
and user-space side https://github.com/falkTX/audio-bridge/blob/main/src/audio-device-impl-linux-mmap.cpp