mb/google/volteer: Add delay to WWAN GPIO init sequence

Based on Fibocom HW user manual RESET should be deasserted at least 20ms after the power on pin.
The design for the reset pin is open drain connected to a pull up, so it is set to high-Z (configured as GPIO in) after 20ms.

BUG=b:152013143
BRANCH=none
TEST=traced the signals using a scope to verify timing is met.

Signed-off-by: Alex Levin <levinale@chromium.org>
Change-Id: I7c947d1bc4cce1f97383a2f2c254986e182661c5
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41356
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions