[coreboot-gerrit] [S] Change in coreboot[master]: mb/google/rex: Add fingerprint SPI

[Tarun Tuli (Code Review)]

Attention is currently required from: Eran Mitrani, Subrata Banik, Kapil Porwal, Eric Lai.

Tarun Tuli has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/66992 )

Change subject: mb/google/rex: Add fingerprint SPI
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Patch Set 19: Code-Review+2

(1 comment)

File src/mainboard/google/rex/variants/rex0/gpio.c:

https://review.coreboot.org/c/coreboot/+/66992/comment/35265b5f_d269805b 
PS14, Line 439: 	/* GPP_B11 : [] ==> EN_FP_PWR */
              : 	PAD_CFG_GPO(GPP_B11, 0, DEEP),
> Not sure, but followed the same procedure as in https://review.coreboot. […]

To be complete, I'd like us to measure (with oscilloscope) and record the timings so we can reference this again (e.g. prove that we are not violating the spec).

1) Period Power is OFF to FPMCU during a reboot
2) Timing between Power being applied to reset being de-asserted