[M] Change in coreboot[master]: soc/amd/common/data_fabric/domain: provide scan_bus and read_resources

[Felix Held (Code Review)]

Attention is currently required from: Fred Reitberger, Jason Glenesk, Matt DeVillier.

Felix Held has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/74717?usp=email )

Change subject: soc/amd/common/data_fabric/domain: provide scan_bus and read_resources
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Patch Set 18:

(1 comment)

File src/soc/amd/common/block/data_fabric/domain.c:

https://review.coreboot.org/c/coreboot/+/74717/comment/e9acf2d7_6be87a44 :
PS18, Line 144: 	/* TODO: Systems with more than one PCI root need to read the data fabric registers to
              : 	   see which IO ranges get decoded to which PCI root. */
              : 
              : 	res = new_resource(domain, (*idx)++);
              : 	res->base = 0;
              : 	res->limit = 0xffff;
              : 	res->flags = IORESOURCE_IO | IORESOURCE_ASSIGNED;
> This is allocated bottom up iirc, so unlikely to cause trouble with reasonable resource usage. […]

i already started working on some follow-up patches that read this info from the DF registers. for my case hard-coding this at first was sufficient, but i'm definitely planning to do this properly in a follow-up