[coreboot-gerrit] Change in coreboot[master]: ec/google/chromeec: Provide EC access for Retimer firmware update

[Tim Wawrzynczak (Code Review)]

Attention is currently required from: John Zhao, Duncan Laurie, Brandon Breitenstein, Rajmohan Mani.
Tim Wawrzynczak has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/49257 )

Change subject: ec/google/chromeec: Provide EC access for Retimer firmware update
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Patch Set 5:

(1 comment)

File src/ec/google/chromeec/ec_acpi.c:

https://review.coreboot.org/c/coreboot/+/49257/comment/b30e9378_17e27173 
PS4, Line 242: \_SB_.PCI0.LPCB.EC0_.
> Got it. The desired path is _SB.PCI0.LPCB.EC0.RFWU. But the chromeec has path _SB.PCI0.LPCB.EC0. […]

You're right, I have been meaning to deal with the whole EC0.CREC thing and haven't had a chance to fix it yet.

until we have separate EC0 & CREC devices in the devicetree, I see two solutions, both are hacks:
1) get to the ec_dev's parent device, e.g., `dev->bus->dev` or
2) just hardcode the entire path as a string like in this patch

I slightly prefer 1, WDYT?