Matthew Garrett has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/37991 )
Change subject: Add a doc describing an ACPI device for controlling platform radios. ......................................................................
Patch Set 1:
https://github.com/mjg59/linux/commit/891df8edf66c8be085b4c690eab9c899011f8d... is a Linux driver for this.