Datasheet

And cancel with ^C once it starts recording.

Now you can run alsamixer - press F6 and select the I2S simple sound card

It will complain there are no playback controls (because its for recording only).

Press F5 to change the volume.

Then you can record with the i2c mic device using

arecord -D dmic_sv -c2 -r 48000 -f S32_LE -t wav -V mono -v recording.wav

arecord -D dmic_sv -c2 -r 44100 -f S32_LE -t wav -V mono -v file.wav