diff --git a/src/mainboard/google/guybrush/smihandler.c b/src/mainboard/google/guybrush/smihandler.c
new file mode 100644
index 0000000000..d61006a08e
--- /dev/null
+++ b/src/mainboard/google/guybrush/smihandler.c
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <baseboard/variants.h>
+#include <cpu/x86/smm.h>
+#include <ec/google/chromeec/smm.h>
+#include <variant/ec.h>
+
+void mainboard_smi_gpi(u32 gpi_sts)
+{
+	chromeec_smi_process_events();
+}
+
+void mainboard_smi_sleep(u8 slp_typ)
+{
+	size_t num_gpios;
+	const struct soc_amd_gpio *gpios;
+
+	chromeec_smi_sleep(slp_typ, MAINBOARD_EC_S3_WAKE_EVENTS, MAINBOARD_EC_S5_WAKE_EVENTS);
+
+	gpios = variant_sleep_gpio_table(&num_gpios);
+	program_gpios(gpios, num_gpios);
+}
+
+int mainboard_smi_apmc(u8 apmc)
+{
+	chromeec_smi_apmc(apmc, MAINBOARD_EC_SCI_EVENTS, MAINBOARD_EC_SMI_EVENTS);
+
+	return 0;
+}
diff --git a/src/mainboard/google/guybrush/variants/baseboard/Makefile.inc b/src/mainboard/google/guybrush/variants/baseboard/Makefile.inc
index 9fb63f5f43..7c092e44c2 100644
--- a/src/mainboard/google/guybrush/variants/baseboard/Makefile.inc
+++ b/src/mainboard/google/guybrush/variants/baseboard/Makefile.inc
@@ -1,3 +1,5 @@
 bootblock-y += gpio.c
 
 ramstage-y += gpio.c
+
+smm-y += gpio.c
diff --git a/src/mainboard/google/guybrush/variants/baseboard/gpio.c b/src/mainboard/google/guybrush/variants/baseboard/gpio.c
index 6d5788d858..68c7d290ef 100644
--- a/src/mainboard/google/guybrush/variants/baseboard/gpio.c
+++ b/src/mainboard/google/guybrush/variants/baseboard/gpio.c
@@ -168,6 +168,11 @@ static const struct soc_amd_gpio bootblock_gpio_table[] = {
 	/* TODO: Fill bootblock gpio configuration */
 };
 
+/* GPIO configuration for sleep */
+static const struct soc_amd_gpio sleep_gpio_table[] = {
+	/* TODO: Fill sleep gpio configuration */
+};
+
 const struct soc_amd_gpio *__weak variant_base_gpio_table(size_t *size)
 {
 	*size = ARRAY_SIZE(base_gpio_table);
@@ -184,3 +189,9 @@ const struct soc_amd_gpio *__weak variant_bootblock_gpio_table(size_t *size)
 	*size = ARRAY_SIZE(bootblock_gpio_table);
 	return bootblock_gpio_table;
 }
+
+const __weak struct soc_amd_gpio *variant_sleep_gpio_table(size_t *size)
+{
+	*size = ARRAY_SIZE(sleep_gpio_table);
+	return sleep_gpio_table;
+}
diff --git a/src/mainboard/google/guybrush/variants/baseboard/include/baseboard/variants.h b/src/mainboard/google/guybrush/variants/baseboard/include/baseboard/variants.h
index 2946463f4b..91a2f147d2 100644
--- a/src/mainboard/google/guybrush/variants/baseboard/include/baseboard/variants.h
+++ b/src/mainboard/google/guybrush/variants/baseboard/include/baseboard/variants.h
@@ -21,4 +21,7 @@ const struct soc_amd_gpio *variant_override_gpio_table(size_t *size);
 /* This function provides GPIO init in bootblock. */
 const struct soc_amd_gpio *variant_bootblock_gpio_table(size_t *size);
 
+/* This function provides GPIO settings before entering sleep. */
+const struct soc_amd_gpio *variant_sleep_gpio_table(size_t *size);
+
 #endif /* __BASEBOARD_VARIANTS_H__ */