[XS] Change in coreboot[main]: mb/google/fatcat: Add FW_CONFIG Support for ALC721 soundwire

[Naveen M (Code Review)]

Attention is currently required from: Anil Kumar K, Pranava Y N, Subrata Banik, Varun Upadhyay.

Naveen M has posted comments on this change by Varun Upadhyay. ( https://review.coreboot.org/c/coreboot/+/85074?usp=email )

Change subject: mb/google/fatcat: Add FW_CONFIG Support for ALC721 soundwire
......................................................................

Patch Set 2:

(1 comment)

File src/mainboard/google/fatcat/variants/fatcat/overridetree.cb:

https://review.coreboot.org/c/coreboot/+/85074/comment/a9b0feb9_eb29fc2b?usp... :
PS2, Line 8: AUDIO_ALC721_SNDW
> > jfyi, at kernel, we add driver data & match table for codec at sndw3.. […]

Yes. This data is important for kernel & ucm.
1. Based on codec combination selected in CBI setting, fw_config is expected to configure h/w gpios.
2. Kernel acpi match table will use this exposed coreboot data and load specific machine driver
3. As same machine driver loads multiple codec combinations, config.star in ui/ucm further granularize & applies required mixer setting for that specific codec