mb/google/nissa: Rework LTE GPIO configuration

Currently, the LTE pins are enabled in gpio.c, then disabled in
fw_config.c if LTE is not present. However, since there's a short delay
between mainboard_init() and fw_config_handle(), this means that when
LTE is not present GPP_H19 (SOC_I2C_SUB_INT_ODL, used for the SAR
sensor) will be floating for a short period of time.

Rework the GPIO config so that the LTE pins are disabled in the
baseboard, then enabled in fw_config.c for variants using LTE. However,
this doesn't work for WWAN_EN and WWAN_RST_L since they need to be
enabled in bootblock. So these are instead enabled in the variant
gpio.c, then disabled in fw_config.c if LTE is not present.

BUG=None
TEST=LTE still works on nivviks

Change-Id: I9d8cbdff5a0dc9bdee87ee0971bc170409d925a2
Signed-off-by: Reka Norman <rekanorman@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64270
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-by: Kangheui Won <khwon@chromium.org>

0 files changed, 0 insertions, 0 deletions