How to enable PDM audio capture card?

[black-device]

Hello, could someone tell me how to use the PDM capture audio card in rk3566?

We are using these pins for this purpose:

The idea is to be able to use this:
Voice Activity Detection(VAD)
 Support read voice data from I2S/PDM
 Support voice amplitude detection
 Support Multi-Mic array data storing
 Support a level combined interrupt

we are compiling with rbuild for cm3 and debian kde.
I have tried to add dts for pdm with those pins but I can't see the audio card in any way.

[RadxaYuntian]

We have not worked with PDM before, but for I2S here is a sample overlay.

[black-device]

Ok thanks for the example!

I would like to use PDM over the extra cm3 pin bank, since I have i2c busy..
please if anyone knows how to do this, I would like to get it up and running.

Anyway, I will try on that i2c base, trying to adapt to pdm.

I've seen some approaches, but I can't get it to work:
https://bbs.elecfans.com/m/jishu_2293712_1_1.html

Thnaks for reply Yuntian.

[RadxaYuntian]

This is I2S, not I2C. A different protocol specifically for audio.

The overlay is also only an example, since it is targetting RK3588 devices.