Instal sof-firmware as described in Arch Linux Wiki:

sudo pacman -S sof-firmware

Blacklist some modules in /etc/modprobe.d/blacklist.conf:

shellblacklist snd_hda_intel
blacklist snd_soc_skl

Configure pulseaudio in /etc/pulse/default.pa:

load-module module-alsa-sink device=hw:0,0 channels=2
load-module module-alsa-source device=hw:0,6 channels=2

Reboot your computer:

sudo reboot 0

Open a terminal and configure the alsamixer to use the sof-firmware:

alsamixer

Press F6

Select sof-hda-dsp.

Store this configuration as default (to persist in the next boot):

sudo alsactl store