[S] Change in coreboot[main]: mb/google/fatcat: Perform early post-memory GPIO configuration

[Subrata Banik (Code Review)]

Attention is currently required from: Jayvik Desai, Kapil Porwal, Pranava Y N.

Hello Jayvik Desai, Kapil Porwal, Pranava Y N, build bot (Jenkins),

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

https://review.coreboot.org/c/coreboot/+/87191?usp=email

to look at the new patch set (#3).

The following approvals got outdated and were removed:
Verified+1 by build bot (Jenkins)

Change subject: mb/google/fatcat: Perform early post-memory GPIO configuration
......................................................................

mb/google/fatcat: Perform early post-memory GPIO configuration

This commit restructures the GPIO configuration for google/fatcat
devices as below.

- Phase 1: GPIO configuration at pre-memory phase. This phase
  configures essential GPIOs like WWAN and storage power sequencing,
  This aligns with the initial power-up requirements of
  these critical components.

- Phase 2: This phase handles GPIO configurations for various
  peripherals like storage type, audio codec, WiFi, cellular interface
  (post initial power sequence), SD card slot, touchpad, touchscreen,
  ISH, PEG/x4 slot wake disable, and fingerprint enable/disable based
  early in post-memory phase (before MPInit).

This phased approach:

- Improves power sequencing by ordering GPIO configuration for proper
  IP power enablement.
- Optimizes boot time by performing more GPIO configuration before
  MPInit and FSP-S, allowing earlier IP stabilization and potentially
  saving ~20ms during device setup and PCIe scan.

`baseboard_devtree_update` remains in `mainboard_init` for baseboard-
specific device tree updates.

TEST=Boot time improved by ~20ms on google/fatcat.

Before:
  70:device setup done      1,339,599 (95,023)

After:
  70:device setup done      1,319,613 (72,381)

Change-Id: I9c2e58ae012cad06f8e498c75745efaa9bad4a25
Signed-off-by: Subrata Banik 
---
M src/mainboard/google/fatcat/mainboard.c
1 file changed, 11 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/91/87191/3