[S] Change in coreboot[main]: mb/google/brya/uldrenite: Add WWAN RW350R-GL power on sequence

[John Su (Code Review)]

John Su has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/85537?usp=email )

Change subject: mb/google/brya/uldrenite: Add WWAN RW350R-GL power on sequence
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mb/google/brya/uldrenite: Add WWAN RW350R-GL power on sequence

Uldrenite support WWAN 5G device, use variant.c to handle the
power on sequence for WWAN RW350R-GL.

BUG=b:381393809
BRANCH=None
TEST=emerge-nissa coreboot

Change-Id: If8695920c2b3d2a27da62afcbe75e70d1ea09792
Signed-off-by: John Su 
---
M src/mainboard/google/brya/variants/uldrenite/Makefile.mk
A src/mainboard/google/brya/variants/uldrenite/variant.c
2 files changed, 38 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/37/85537/1

diff --git a/src/mainboard/google/brya/variants/uldrenite/Makefile.mk b/src/mainboard/google/brya/variants/uldrenite/Makefile.mk
index 91f031e..b8b2532 100644
--- a/src/mainboard/google/brya/variants/uldrenite/Makefile.mk
+++ b/src/mainboard/google/brya/variants/uldrenite/Makefile.mk
@@ -3,3 +3,5 @@
 bootblock-y += gpio.c
 romstage-y += gpio.c
 ramstage-y += gpio.c
+
+ramstage-$(CONFIG_FW_CONFIG) += variant.c
diff --git a/src/mainboard/google/brya/variants/uldrenite/variant.c b/src/mainboard/google/brya/variants/uldrenite/variant.c
new file mode 100644
index 0000000..25e0076
--- /dev/null
+++ b/src/mainboard/google/brya/variants/uldrenite/variant.c
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <baseboard/gpio.h>
+#include <baseboard/variants.h>
+#include <console/console.h>
+#include <delay.h>
+
+#define RW350R_RST_DELAY_MS 20
+#define RW350R_PERST_DELAY_MS 30
+
+static const struct pad_config rw350r_en_pad[] = {
+	/* H23 : LTE_PWR_OFF_EN */
+	PAD_CFG_GPO(GPP_H23, 1, DEEP),
+};
+static const struct pad_config rw350r_rst_pad[] = {
+	/* F12 : WWAN_RST_L */
+	PAD_CFG_GPO_LOCK(GPP_F12, 1, LOCK_CONFIG),
+};
+static const struct pad_config rw350r_perst_pad[] = {
+	/* F13 : PLTRST_WWAN# */
+	PAD_CFG_GPO(GPP_F13, 1, DEEP),
+};
+
+void variant_init(void)
+{
+	/*
+	* RW350R power on seuqence:
+	* De-assert WWAN_EN -> 20ms -> de-assert WWAN_RST -> 30ms ->
+	* de-assert WWAN_PERST
+	*/
+	gpio_configure_pads(rw350r_en_pad, ARRAY_SIZE(rw350r_en_pad));
+	mdelay(RW350R_RST_DELAY_MS);
+	gpio_configure_pads(rw350r_rst_pad, ARRAY_SIZE(rw350r_rst_pad));
+	mdelay(RW350R_PERST_DELAY_MS);
+	gpio_configure_pads(rw350r_perst_pad, ARRAY_SIZE(rw350r_perst_pad));
+}