No sound card on Olimex A20 SOM EVB with FreeBSD 12.4

Hello,

   We made custom device based on Olimex A20 SOM EVB board. I'm 
migrating our application from FreeBSD 11.2 to FreeBSD 12.4. Our 
application requires sound card and I found that if I install fresh OS, 
I'm missing sound card device (/dev/dsp).
   Sound card supported by the board has source in 
src/sys/arm/allwinner/a10_codec.c and code was not changed for ages and 
is part of 11.2, 12.x and 13.x branch.

   I spend hours by checking why I'm missing sound device and I learn 
that during boot is printed:

FreeBSD 11.2:
pcm0: <Allwinner Audio Codec> mem 0x1c22c00-0x1c22c3f irq 35 on simplebus0
pcm0: Mixer "vol":
pcm0: Mixer "line":
pcm0: Mixer "rec":

FreeBSD 12.4:
pcm0: <Allwinner Audio Codec> mem 0x1c22c00-0x1c22c3f irq 46 on simplebus0
pcm0: cannot find codec clock

   I searched source code of sound card driver and I found:

   if (clk_get_by_ofw_name(dev, 0, "codec", &clk_codec) != 0) {
     device_printf(dev, "cannot find codec clock\n");
     goto fail;
   }

   so it tries to find "codec" clock.
   I expect it should be found/configured based on dtb file and I expect 
that dtb was changed between releases. I hope I'm able to extend dtb for 
the board.
   The issue is that I don't know which codec clock it searches for. I 
analyzed boot -v from 11.2 and 12.4 and I'm not able to identify it. 
There are several "codec" word in boot log, but I don't know how the 
code decide which one is correct/missing just based on word "codec" from 
source code.
   I went thru dts sources, but I'm not able to identify "codec" neither.

   Can I ask for help to identify which clock shown in 11.2 boot log are 
missing in 12.4 boot log?

					Best regards,

						Jirka Novak