mb/google/brya: Adjust WWAN power sequence
Follow L850GL spec to adjust power sequence. RST need to drive low
before power on then drive to high.
SPEC:FIBOCOM_L850-GL Hardware User Manual_V1.0.8
BUG=b:186374631
TEST=WWAN is detected by lsusb.
Signed-off-by: Eric Lai <ericr_lai@compal.corp-partner.google.com>
Change-Id: I13357677bb1ab185abf1d4c915a762a9d6894312
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52694
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
diff --git a/src/mainboard/google/brya/variants/baseboard/gpio.c b/src/mainboard/google/brya/variants/baseboard/gpio.c
index 5811b58..b7783c0 100644
--- a/src/mainboard/google/brya/variants/baseboard/gpio.c
+++ b/src/mainboard/google/brya/variants/baseboard/gpio.c
@@ -388,6 +388,8 @@
PAD_CFG_GPO(GPP_E0, 0, DEEP),
/* E13 : THC0_SPI1_IO2 ==> MEM_CH_SEL */
PAD_CFG_GPI(GPP_E13, NONE, DEEP),
+ /* E16 : RSVD_TP ==> WWAN_RST_L */
+ PAD_CFG_GPO(GPP_E16, 0, DEEP),
/* E15 : RSVD_TP ==> PCH_WP_OD */
PAD_CFG_GPI_GPIO_DRIVER(GPP_E15, NONE, DEEP),
/* H10 : UART0_RXD ==> UART_PCH_RX_DBG_TX */