Change in coreboot[master]: mb/google/brya/var/nereid: Enable AUX DC biasing on C0 and C1

[Reka Norman (Code Review)]

Attention is currently required from: Sam McNally, Kangheui Won, Rizwan Qureshi, Tim Wawrzynczak, Krishna P Bhat D, Usha P.
Hello Sam McNally, Reka Norman, Kangheui Won, Rizwan Qureshi, Tim Wawrzynczak, Krishna P Bhat D, Usha P,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/63199

to look at the new patch set (#2).

Change subject: mb/google/brya/var/nereid: Enable AUX DC biasing on C0 and C1
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mb/google/brya/var/nereid: Enable AUX DC biasing on C0 and C1

C0 has no redriver, so enable SBU muxing the in the SoC.

C1 has a redriver which does SBU muxing, so disable SBU muxing in the
SoC. However, this also disables AUX biasing when the pins are
configured as NF6. So instead configure the C1 AUX bias pins as GPO.

BUG=b:227259673
TEST=Voltages are correct on the C0 and C1 AUX bias pins

Change-Id: Ic0af662ecc1c6cee15b4ae98cb02deeefc93a71e
Signed-off-by: Reka Norman 
---
M src/mainboard/google/brya/variants/nereid/gpio.c
M src/mainboard/google/brya/variants/nereid/overridetree.cb
2 files changed, 9 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/99/63199/2