zephyr: volteer: move gpio device-tree to DTS overlay

Move device-tree GPIO definitions (named-gpios and nuvoton low voltage
selection list) to a Zephyr DTS overlay.  These are board-specific and
shouldn't be shared with delbin.

BUG=b:183643832
BRANCH=none
TEST=compile zephyr for volteer

Signed-off-by: Jack Rosenthal <jrosenth@chromium.org>
Change-Id: I258aa024a6d32598326490be1f0d2a5e7000f72a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2787345
Reviewed-by: Simon Glass <sjg@chromium.org>

3 files changed, 310 insertions, 302 deletions

diff --git a/zephyr/projects/volteer/boards/arm/volteer/volteer.dts b/zephyr/projects/volteer/boards/arm/volteer/volteer.dts
index cfe8de58b7..740d4ce269 100644
--- a/zephyr/projects/volteer/boards/arm/volteer/volteer.dts
+++ b/zephyr/projects/volteer/boards/arm/volteer/volteer.dts
@@ -187,308 +187,6 @@
 		};
 	};
 
-	named-gpios {
-		compatible = "named-gpios";
-
-		ec_lid_open {
-			gpios = <&gpiod 2 GPIO_INPUT>;
-			label = "EC_LID_OPEN";
-		};
-		ec_wp_l {
-			gpios = <&gpioa 1 GPIO_INPUT>;
-			label = "EC_WP_L";
-		};
-		h1_ec_pwr_btn_odl {
-			gpios = <&gpio0 1 GPIO_INPUT>;
-			label = "H1_EC_PWR_BTN_ODL";
-		};
-		acok_od {
-			gpios = <&gpio0 0 GPIO_INPUT>;
-			label = "ACOK_OD";
-		};
-		slp_s0_l {
-			gpios = <&gpiod 5 GPIO_INPUT>;
-			label = "SLP_S0_L";
-		};
-		slp_s3_l {
-			gpios = <&gpioa 5 GPIO_INPUT>;
-			label = "SLP_S3_L";
-		};
-		slp_sus_l {
-			gpios = <&gpiod 7 GPIO_INPUT>;
-			label = "SLP_SUS_L";
-		};
-		pg_ec_rsmrst_odl {
-			gpios = <&gpioe 2 GPIO_INPUT>;
-			label = "PG_EC_RSMRST_ODL";
-		};
-		pg_ec_dsw_pwrok {
-			gpios = <&gpioc 7 GPIO_INPUT>;
-			label = "PG_EC_DSW_PWROK";
-		};
-		pg_ec_all_sys_pwrgd {
-			gpios = <&gpiof 4 GPIO_INPUT>;
-			label = "PG_EC_ALL_SYS_PWRGD";
-		};
-		gpio_ec_imu_int_l: ec_imu_int_l {
-			gpios = <&gpio5 6 GPIO_INPUT>;
-			label = "EC_IMU_INT_L";
-		};
-		gpio_ec_als_rgb_int_l: ec_als_rgb_int_l {
-			gpios = <&gpiod 4 GPIO_INPUT>;
-			label = "EC_ALS_RGB_INT_L";
-		};
-		tablet_mode_l {
-			gpios = <&gpio9 5 GPIO_INPUT>;
-			label = "TABLET_MODE_L";
-		};
-		ec_accel_int {
-			gpios = <&gpio8 1 (GPIO_INPUT | GPIO_PULL_UP)>;
-			label = "EC_ACCEL_INT";
-		};
-		usb_c0_tcpc_int_odl {
-			gpios = <&gpioe 0 GPIO_INPUT>;
-			label = "USB_C0_TCPC_INT_ODL";
-		};
-		usb_c1_tcpc_int_odl {
-			gpios = <&gpioa 2 GPIO_INPUT>;
-			label = "USB_C1_TCPC_INT_ODL";
-		};
-		usb_c0_ppc_int_odl {
-			gpios = <&gpio6 2 GPIO_INPUT>;
-			label = "USB_C0_PPC_INT_ODL";
-		};
-		usb_c1_ppc_int_odl {
-			gpios = <&gpiof 5 GPIO_INPUT>;
-			label = "USB_C1_PPC_INT_ODL";
-		};
-		usb_c0_bc12_int_odl {
-			gpios = <&gpioe 4 GPIO_INPUT>;
-			label = "USB_C0_BC12_INT_ODL";
-		};
-		gpio_usb_c1_mix_int_odl: usb_c1_mix_int_odl {
-			#gpio-cells = <0>;
-			gpios = <&gpio0 3 GPIO_INPUT>;
-			label = "USB_C1_MIX_INT_ODL";
-		};
-		usb_c1_frs_en {
-			gpios = <&gpio9 4 GPIO_OUT_LOW>;
-			label = "USB_C1_FRS_EN";
-		};
-		ec_voldn_btn_odl {
-			gpios = <&gpio9 3 (GPIO_INPUT | GPIO_PULL_UP)>;
-			label = "EC_VOLDN_BTN_ODL";
-		};
-		ec_volup_btn_odl {
-			gpios = <&gpio9 7 (GPIO_INPUT | GPIO_PULL_UP)>;
-			label = "EC_VOLUP_BTN_ODL";
-		};
-		en_pp3300_a {
-			gpios = <&gpioa 3 GPIO_OUT_LOW>;
-			label = "EN_PP3300_A";
-		};
-		en_pp5000_a {
-			gpios = <&gpioa 4 GPIO_OUT_LOW>;
-			label = "EN_PP5000_A";
-		};
-		en_ppvar_vccin {
-			gpios = <&gpio4 3 GPIO_OUT_LOW>;
-			label = "EN_PPVAR_VCCIN";
-		};
-		ec_pch_dsw_pwrok {
-			gpios = <&gpioc 0 GPIO_OUT_LOW>;
-			label = "EC_PCH_DSW_PWROK";
-		};
-		ec_rst_odl {
-			gpios = <&gpio0 2 GPIO_INPUT>;
-			label = "EC_RST_ODL";
-		};
-		ec_pch_sys_pwrok {
-			gpios = <&gpio3 7 GPIO_OUT_LOW>;
-			label = "EC_PCH_SYS_PWROK";
-		};
-		ec_pch_rsmrst_odl {
-			gpios = <&gpioa 6 GPIO_ODR_LOW>;
-			label = "EC_PCH_RSMRST_ODL";
-		};
-		ec_pch_pwr_btn_odl {
-			gpios = <&gpioc 1 GPIO_ODR_HIGH>;
-			label = "EC_PCH_PWR_BTN_ODL";
-		};
-		ec_pch_rtcrst {
-			gpios = <&gpio7 6 GPIO_OUT_LOW>;
-			label = "EC_PCH_RTCRST";
-		};
-		ec_pch_wake_odl {
-			gpios = <&gpio7 4 GPIO_ODR_HIGH>;
-			label = "EC_PCH_WAKE_ODL";
-		};
-		ec_entering_rw {
-			gpios = <&gpioe 3 GPIO_OUT_LOW>;
-			label = "EC_ENTERING_RW";
-		};
-		ec_prochot_odl {
-			gpios = <&gpio6 3 GPIO_ODR_HIGH>;
-			label = "EC_PROCHOT_ODL";
-		};
-		ec_prochot_in_l {
-			gpios = <&gpiof 0 GPIO_INPUT>;
-			label = "EC_PROCHOT_IN_L";
-		};
-		sys_rst_odl {
-			gpios = <&gpioc 5 GPIO_ODR_HIGH>;
-			label = "SYS_RST_ODL";
-		};
-		ec_pch_int_odl {
-			gpios = <&gpiob 0 GPIO_ODR_HIGH>;
-			label = "EC_PCH_INT_ODL";
-		};
-		en_pp5000_usba {
-			gpios = <&gpioc 6 GPIO_OUT_LOW>;
-			label = "EN_PP5000_USBA";
-		};
-		usb_a_low_pwr_od {
-			gpios = <&gpio6 6 GPIO_ODR_LOW>;
-			label = "USB_A_LOW_PWR_OD";
-		};
-		gpio_usb_c1_rt_rst_odl_boardid_0: usb_c1_rt_rst_odl_boardid_0 {
-			#gpio-cells = <0>;
-			gpios = <&gpio3 2 GPIO_ODR_LOW>;
-			label = "USB_C1_RT_RST_ODL_BOARDID_0";
-		};
-		gpio_usb_c1_rt_rst_odl: usb_c1_rt_rst_odl {
-			#gpio-cells = <0>;
-			gpios = <&gpio8 3 GPIO_ODR_LOW>;
-			label = "USB_C1_RT_RST_ODL";
-		};
-		usb_c0_oc_odl {
-			gpios = <&gpiob 1 GPIO_ODR_HIGH>;
-			label = "USB_C0_OC_ODL";
-		};
-		usb_c1_oc_odl {
-			gpios = <&gpio5 0 GPIO_ODR_HIGH>;
-			label = "USB_C1_OC_ODL";
-		};
-		usb_c1_rt_int_odl {
-			gpios = <&gpiof 3 GPIO_INPUT>;
-			label = "USB_C1_RT_INT_ODL";
-		};
-		ec_h1_packet_mode {
-			gpios = <&gpio7 5 GPIO_OUT_LOW>;
-			label = "EC_H1_PACKET_MODE";
-		};
-		m2_ssd_pln {
-			gpios = <&gpioa 0 GPIO_ODR_HIGH>;
-			label = "M2_SSD_PLN";
-		};
-		m2_ssd_pla {
-			gpios = <&gpio7 0 GPIO_INPUT>;
-			label = "M2_SSD_PLA";
-		};
-		ccd_mode_odl {
-			gpios = <&gpioe 5 GPIO_INPUT>;
-			label = "CCD_MODE_ODL";
-		};
-		ec_slp_s0ix {
-			gpios = <&gpio7 2 (GPIO_INPUT | GPIO_PULL_UP)>;
-			label = "EC_SLP_S0IX";
-		};
-		gpio_unused_gpio41: unused_gpio41 {
-			#gpio-cells = <0>;
-			gpios = <&gpio4 1 (GPIO_INPUT | GPIO_PULL_UP)>;
-			label = "UNUSED_GPIO41";
-		};
-		unused_gpiof2 {
-			gpios = <&gpiof 2 (GPIO_INPUT | GPIO_PULL_UP)>;
-			label = "UNUSED_GPIOF2";
-		};
-		unused_gpio96 {
-			gpios = <&gpio9 6 (GPIO_INPUT | GPIO_PULL_UP)>;
-			label = "UNUSED_GPIO96";
-		};
-		unused_gpio34 {
-			gpios = <&gpio3 4 (GPIO_INPUT | GPIO_PULL_UP)>;
-			label = "UNUSED_GPIO34";
-		};
-		ec_kb_bl_en {
-			gpios = <&gpio8 6 (GPIO_INPUT | GPIO_PULL_UP)>;
-			label = "EC_KB_BL_EN";
-		};
-		ec_espi_alert_l {
-			gpios = <&gpio5 7 (GPIO_INPUT | GPIO_PULL_UP)>;
-			label = "EC_ESPI_ALERT_L";
-		};
-		ec_edp_bl_en {
-			gpios = <&gpiod 3 GPIO_OUT_HIGH>;
-			label = "EC_EDP_BL_EN";
-		};
-		ec_i2c0_sensor_scl {
-			gpios = <&gpiob 5 GPIO_INPUT>;
-			label = "EC_I2C0_SENSOR_SCL";
-		};
-		ec_i2c0_sensor_sda {
-			gpios = <&gpiob 4 GPIO_INPUT>;
-			label = "EC_I2C0_SENSOR_SDA";
-		};
-		ec_i2c1_usb_c0_scl {
-			gpios = <&gpio9 0 GPIO_INPUT>;
-			label = "EC_I2C1_USB_C0_SCL";
-		};
-		ec_i2c1_usb_c0_sda {
-			gpios = <&gpio8 7 GPIO_INPUT>;
-			label = "EC_I2C1_USB_C0_SDA";
-		};
-		ec_i2c2_usb_c1_scl {
-			gpios = <&gpio9 2 GPIO_INPUT>;
-			label = "EC_I2C2_USB_C1_SCL";
-		};
-		ec_i2c2_usb_c1_sda {
-			gpios = <&gpio9 1 GPIO_INPUT>;
-			label = "EC_I2C2_USB_C1_SDA";
-		};
-		ec_i2c3_usb_1_mix_scl {
-			gpios = <&gpiod 1 GPIO_INPUT>;
-			label = "EC_I2C3_USB_1_MIX_SCL";
-		};
-		ec_i2c3_usb_1_mix_sda {
-			gpios = <&gpiod 0 GPIO_INPUT>;
-			label = "EC_I2C3_USB_1_MIX_SDA";
-		};
-		ec_i2c5_battery_scl {
-			gpios = <&gpio3 3 GPIO_INPUT>;
-			label = "EC_I2C5_BATTERY_SCL";
-		};
-		ec_i2c5_battery_sda {
-			gpios = <&gpio3 6 GPIO_INPUT>;
-			label = "EC_I2C5_BATTERY_SDA";
-		};
-		ec_i2c7_eeprom_pwr_scl_r {
-			gpios = <&gpiob 3 GPIO_INPUT>;
-			label = "EC_I2C7_EEPROM_PWR_SCL_R";
-		};
-		ec_i2c7_eeprom_pwr_sda_r {
-			gpios = <&gpiob 2 GPIO_INPUT>;
-			label = "EC_I2C7_EEPROM_PWR_SDA_R";
-		};
-		ec_batt_pres_odl {
-			gpios = <&gpioe 1 GPIO_INPUT>;
-			label = "EC_BATT_PRES_ODL";
-		};
-		gpio_en_pp5000_fan: en_pp5000_fan {
-			gpios = <&gpio6 1 GPIO_OUT_LOW>;
-			label = "EN_PP5000_FAN";
-		};
-		ec_kso_02_inv {
-			gpios = <&gpio1 7 GPIO_OUT_LOW>;
-			label = "EC_KSO_02_INV";
-		};
-	};
-
-	def_lvol_io_list {
-		compatible = "nuvoton,npcx-lvolctrl-def";
-		lvol_io_pads = <&lvol_iob4 &lvol_iob5>; /* I2C_SDA0 & SCL0 */
-	};
-
 	soc {
 		cros_kb_raw: cros-kb-raw@400a3000 {
 			compatible = "nuvoton,npcx-cros-kb-raw";
diff --git a/zephyr/projects/volteer/volteer/gpio.dts b/zephyr/projects/volteer/volteer/gpio.dts
new file mode 100644
index 0000000000..cd4e780253
--- /dev/null
+++ b/zephyr/projects/volteer/volteer/gpio.dts
@@ -0,0 +1,308 @@
+/* Copyright 2021 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/ {
+	named-gpios {
+		compatible = "named-gpios";
+
+		ec_lid_open {
+			gpios = <&gpiod 2 GPIO_INPUT>;
+			label = "EC_LID_OPEN";
+		};
+		ec_wp_l {
+			gpios = <&gpioa 1 GPIO_INPUT>;
+			label = "EC_WP_L";
+		};
+		h1_ec_pwr_btn_odl {
+			gpios = <&gpio0 1 GPIO_INPUT>;
+			label = "H1_EC_PWR_BTN_ODL";
+		};
+		acok_od {
+			gpios = <&gpio0 0 GPIO_INPUT>;
+			label = "ACOK_OD";
+		};
+		slp_s0_l {
+			gpios = <&gpiod 5 GPIO_INPUT>;
+			label = "SLP_S0_L";
+		};
+		slp_s3_l {
+			gpios = <&gpioa 5 GPIO_INPUT>;
+			label = "SLP_S3_L";
+		};
+		slp_sus_l {
+			gpios = <&gpiod 7 GPIO_INPUT>;
+			label = "SLP_SUS_L";
+		};
+		pg_ec_rsmrst_odl {
+			gpios = <&gpioe 2 GPIO_INPUT>;
+			label = "PG_EC_RSMRST_ODL";
+		};
+		pg_ec_dsw_pwrok {
+			gpios = <&gpioc 7 GPIO_INPUT>;
+			label = "PG_EC_DSW_PWROK";
+		};
+		pg_ec_all_sys_pwrgd {
+			gpios = <&gpiof 4 GPIO_INPUT>;
+			label = "PG_EC_ALL_SYS_PWRGD";
+		};
+		gpio_ec_imu_int_l: ec_imu_int_l {
+			gpios = <&gpio5 6 GPIO_INPUT>;
+			label = "EC_IMU_INT_L";
+		};
+		gpio_ec_als_rgb_int_l: ec_als_rgb_int_l {
+			gpios = <&gpiod 4 GPIO_INPUT>;
+			label = "EC_ALS_RGB_INT_L";
+		};
+		tablet_mode_l {
+			gpios = <&gpio9 5 GPIO_INPUT>;
+			label = "TABLET_MODE_L";
+		};
+		ec_accel_int {
+			gpios = <&gpio8 1 (GPIO_INPUT | GPIO_PULL_UP)>;
+			label = "EC_ACCEL_INT";
+		};
+		usb_c0_tcpc_int_odl {
+			gpios = <&gpioe 0 GPIO_INPUT>;
+			label = "USB_C0_TCPC_INT_ODL";
+		};
+		usb_c1_tcpc_int_odl {
+			gpios = <&gpioa 2 GPIO_INPUT>;
+			label = "USB_C1_TCPC_INT_ODL";
+		};
+		usb_c0_ppc_int_odl {
+			gpios = <&gpio6 2 GPIO_INPUT>;
+			label = "USB_C0_PPC_INT_ODL";
+		};
+		usb_c1_ppc_int_odl {
+			gpios = <&gpiof 5 GPIO_INPUT>;
+			label = "USB_C1_PPC_INT_ODL";
+		};
+		usb_c0_bc12_int_odl {
+			gpios = <&gpioe 4 GPIO_INPUT>;
+			label = "USB_C0_BC12_INT_ODL";
+		};
+		gpio_usb_c1_mix_int_odl: usb_c1_mix_int_odl {
+			#gpio-cells = <0>;
+			gpios = <&gpio0 3 GPIO_INPUT>;
+			label = "USB_C1_MIX_INT_ODL";
+		};
+		usb_c1_frs_en {
+			gpios = <&gpio9 4 GPIO_OUT_LOW>;
+			label = "USB_C1_FRS_EN";
+		};
+		ec_voldn_btn_odl {
+			gpios = <&gpio9 3 (GPIO_INPUT | GPIO_PULL_UP)>;
+			label = "EC_VOLDN_BTN_ODL";
+		};
+		ec_volup_btn_odl {
+			gpios = <&gpio9 7 (GPIO_INPUT | GPIO_PULL_UP)>;
+			label = "EC_VOLUP_BTN_ODL";
+		};
+		en_pp3300_a {
+			gpios = <&gpioa 3 GPIO_OUT_LOW>;
+			label = "EN_PP3300_A";
+		};
+		en_pp5000_a {
+			gpios = <&gpioa 4 GPIO_OUT_LOW>;
+			label = "EN_PP5000_A";
+		};
+		en_ppvar_vccin {
+			gpios = <&gpio4 3 GPIO_OUT_LOW>;
+			label = "EN_PPVAR_VCCIN";
+		};
+		ec_pch_dsw_pwrok {
+			gpios = <&gpioc 0 GPIO_OUT_LOW>;
+			label = "EC_PCH_DSW_PWROK";
+		};
+		ec_rst_odl {
+			gpios = <&gpio0 2 GPIO_INPUT>;
+			label = "EC_RST_ODL";
+		};
+		ec_pch_sys_pwrok {
+			gpios = <&gpio3 7 GPIO_OUT_LOW>;
+			label = "EC_PCH_SYS_PWROK";
+		};
+		ec_pch_rsmrst_odl {
+			gpios = <&gpioa 6 GPIO_ODR_LOW>;
+			label = "EC_PCH_RSMRST_ODL";
+		};
+		ec_pch_pwr_btn_odl {
+			gpios = <&gpioc 1 GPIO_ODR_HIGH>;
+			label = "EC_PCH_PWR_BTN_ODL";
+		};
+		ec_pch_rtcrst {
+			gpios = <&gpio7 6 GPIO_OUT_LOW>;
+			label = "EC_PCH_RTCRST";
+		};
+		ec_pch_wake_odl {
+			gpios = <&gpio7 4 GPIO_ODR_HIGH>;
+			label = "EC_PCH_WAKE_ODL";
+		};
+		ec_entering_rw {
+			gpios = <&gpioe 3 GPIO_OUT_LOW>;
+			label = "EC_ENTERING_RW";
+		};
+		ec_prochot_odl {
+			gpios = <&gpio6 3 GPIO_ODR_HIGH>;
+			label = "EC_PROCHOT_ODL";
+		};
+		ec_prochot_in_l {
+			gpios = <&gpiof 0 GPIO_INPUT>;
+			label = "EC_PROCHOT_IN_L";
+		};
+		sys_rst_odl {
+			gpios = <&gpioc 5 GPIO_ODR_HIGH>;
+			label = "SYS_RST_ODL";
+		};
+		ec_pch_int_odl {
+			gpios = <&gpiob 0 GPIO_ODR_HIGH>;
+			label = "EC_PCH_INT_ODL";
+		};
+		en_pp5000_usba {
+			gpios = <&gpioc 6 GPIO_OUT_LOW>;
+			label = "EN_PP5000_USBA";
+		};
+		usb_a_low_pwr_od {
+			gpios = <&gpio6 6 GPIO_ODR_LOW>;
+			label = "USB_A_LOW_PWR_OD";
+		};
+		gpio_usb_c1_rt_rst_odl_boardid_0: usb_c1_rt_rst_odl_boardid_0 {
+			#gpio-cells = <0>;
+			gpios = <&gpio3 2 GPIO_ODR_LOW>;
+			label = "USB_C1_RT_RST_ODL_BOARDID_0";
+		};
+		gpio_usb_c1_rt_rst_odl: usb_c1_rt_rst_odl {
+			#gpio-cells = <0>;
+			gpios = <&gpio8 3 GPIO_ODR_LOW>;
+			label = "USB_C1_RT_RST_ODL";
+		};
+		usb_c0_oc_odl {
+			gpios = <&gpiob 1 GPIO_ODR_HIGH>;
+			label = "USB_C0_OC_ODL";
+		};
+		usb_c1_oc_odl {
+			gpios = <&gpio5 0 GPIO_ODR_HIGH>;
+			label = "USB_C1_OC_ODL";
+		};
+		usb_c1_rt_int_odl {
+			gpios = <&gpiof 3 GPIO_INPUT>;
+			label = "USB_C1_RT_INT_ODL";
+		};
+		ec_h1_packet_mode {
+			gpios = <&gpio7 5 GPIO_OUT_LOW>;
+			label = "EC_H1_PACKET_MODE";
+		};
+		m2_ssd_pln {
+			gpios = <&gpioa 0 GPIO_ODR_HIGH>;
+			label = "M2_SSD_PLN";
+		};
+		m2_ssd_pla {
+			gpios = <&gpio7 0 GPIO_INPUT>;
+			label = "M2_SSD_PLA";
+		};
+		ccd_mode_odl {
+			gpios = <&gpioe 5 GPIO_INPUT>;
+			label = "CCD_MODE_ODL";
+		};
+		ec_slp_s0ix {
+			gpios = <&gpio7 2 (GPIO_INPUT | GPIO_PULL_UP)>;
+			label = "EC_SLP_S0IX";
+		};
+		gpio_unused_gpio41: unused_gpio41 {
+			#gpio-cells = <0>;
+			gpios = <&gpio4 1 (GPIO_INPUT | GPIO_PULL_UP)>;
+			label = "UNUSED_GPIO41";
+		};
+		unused_gpiof2 {
+			gpios = <&gpiof 2 (GPIO_INPUT | GPIO_PULL_UP)>;
+			label = "UNUSED_GPIOF2";
+		};
+		unused_gpio96 {
+			gpios = <&gpio9 6 (GPIO_INPUT | GPIO_PULL_UP)>;
+			label = "UNUSED_GPIO96";
+		};
+		unused_gpio34 {
+			gpios = <&gpio3 4 (GPIO_INPUT | GPIO_PULL_UP)>;
+			label = "UNUSED_GPIO34";
+		};
+		ec_kb_bl_en {
+			gpios = <&gpio8 6 (GPIO_INPUT | GPIO_PULL_UP)>;
+			label = "EC_KB_BL_EN";
+		};
+		ec_espi_alert_l {
+			gpios = <&gpio5 7 (GPIO_INPUT | GPIO_PULL_UP)>;
+			label = "EC_ESPI_ALERT_L";
+		};
+		ec_edp_bl_en {
+			gpios = <&gpiod 3 GPIO_OUT_HIGH>;
+			label = "EC_EDP_BL_EN";
+		};
+		ec_i2c0_sensor_scl {
+			gpios = <&gpiob 5 GPIO_INPUT>;
+			label = "EC_I2C0_SENSOR_SCL";
+		};
+		ec_i2c0_sensor_sda {
+			gpios = <&gpiob 4 GPIO_INPUT>;
+			label = "EC_I2C0_SENSOR_SDA";
+		};
+		ec_i2c1_usb_c0_scl {
+			gpios = <&gpio9 0 GPIO_INPUT>;
+			label = "EC_I2C1_USB_C0_SCL";
+		};
+		ec_i2c1_usb_c0_sda {
+			gpios = <&gpio8 7 GPIO_INPUT>;
+			label = "EC_I2C1_USB_C0_SDA";
+		};
+		ec_i2c2_usb_c1_scl {
+			gpios = <&gpio9 2 GPIO_INPUT>;
+			label = "EC_I2C2_USB_C1_SCL";
+		};
+		ec_i2c2_usb_c1_sda {
+			gpios = <&gpio9 1 GPIO_INPUT>;
+			label = "EC_I2C2_USB_C1_SDA";
+		};
+		ec_i2c3_usb_1_mix_scl {
+			gpios = <&gpiod 1 GPIO_INPUT>;
+			label = "EC_I2C3_USB_1_MIX_SCL";
+		};
+		ec_i2c3_usb_1_mix_sda {
+			gpios = <&gpiod 0 GPIO_INPUT>;
+			label = "EC_I2C3_USB_1_MIX_SDA";
+		};
+		ec_i2c5_battery_scl {
+			gpios = <&gpio3 3 GPIO_INPUT>;
+			label = "EC_I2C5_BATTERY_SCL";
+		};
+		ec_i2c5_battery_sda {
+			gpios = <&gpio3 6 GPIO_INPUT>;
+			label = "EC_I2C5_BATTERY_SDA";
+		};
+		ec_i2c7_eeprom_pwr_scl_r {
+			gpios = <&gpiob 3 GPIO_INPUT>;
+			label = "EC_I2C7_EEPROM_PWR_SCL_R";
+		};
+		ec_i2c7_eeprom_pwr_sda_r {
+			gpios = <&gpiob 2 GPIO_INPUT>;
+			label = "EC_I2C7_EEPROM_PWR_SDA_R";
+		};
+		ec_batt_pres_odl {
+			gpios = <&gpioe 1 GPIO_INPUT>;
+			label = "EC_BATT_PRES_ODL";
+		};
+		gpio_en_pp5000_fan: en_pp5000_fan {
+			gpios = <&gpio6 1 GPIO_OUT_LOW>;
+			label = "EN_PP5000_FAN";
+		};
+		ec_kso_02_inv {
+			gpios = <&gpio1 7 GPIO_OUT_LOW>;
+			label = "EC_KSO_02_INV";
+		};
+	};
+
+	def_lvol_io_list {
+		compatible = "nuvoton,npcx-lvolctrl-def";
+		lvol_io_pads = <&lvol_iob4 &lvol_iob5>; /* I2C_SDA0 & SCL0 */
+	};
+};
diff --git a/zephyr/projects/volteer/volteer/zmake.yaml b/zephyr/projects/volteer/volteer/zmake.yaml
index 2c4774ed4a..636495e816 100644
--- a/zephyr/projects/volteer/volteer/zmake.yaml
+++ b/zephyr/projects/volteer/volteer/zmake.yaml
@@ -3,6 +3,8 @@
 # found in the LICENSE file.
 
 board: volteer
+dts-overlays:
+  - gpio.dts
 supported-zephyr-versions:
   - v2.5
 toolchain: coreboot-sdk