Continuation of the topic the problem with capturing audio on CubieBoard2.
At the moment, the issue has been resolved.
In file sun4i-codec.c there was no description of the ADCIS register, which is responsible for selecting the sound source.
Modifications have been made to file sun4i-codec.c to select the Capture Source and Captute Level.
New sun4i-codec.c
Patch sun4i-codec.c
If it is possible to make these changes to the kernel for builds Armbian Buster & Armbian Focal.
This change is needed for the A20 processors.
olegoldtom got a reaction from Werner in No support Capture selection, for Allwinner A20 Audio Codec