mb/google/dedede/var/sasuke: Add LTE modem support

This change enables LTE modem for sasuke.
- Add LTE modem device into devicetree
- Add GPIO control for LTE modem power on and off

BUG=177177967
TEST=Built and verified modem device existence with lsusb

Change-Id: I34ba8ab00b73f24d1786ab014e9981b172a63a27
Signed-off-by: Seunghwan Kim <sh_.kim@samsung.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49163
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/src/mainboard/google/dedede/variants/sasuke/variant.c b/src/mainboard/google/dedede/variants/sasuke/variant.c
new file mode 100644
index 0000000000..22caa069d3
--- /dev/null
+++ b/src/mainboard/google/dedede/variants/sasuke/variant.c
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <acpi/acpi.h>
+#include <baseboard/variants.h>
+#include <delay.h>
+#include <gpio.h>
+
+static void power_off_lte_module(void)
+{
+	gpio_output(GPP_H17, 0);
+	mdelay(20);
+	gpio_output(GPP_A10, 0);
+}
+
+void variant_smi_sleep(u8 slp_typ)
+{
+	/*
+	 * Once the FW_CONFIG is provisioned, power off LTE module only under
+	 * the situation where it is stuffed.
+	 */
+	if (slp_typ == ACPI_S5)
+		power_off_lte_module();
+}