dts: power: Add npcx PSL DT node.

Add NPCX Power Switch Logic (PSL) DT node which controls the power rails
of SoC to get better power consumption.

Signed-off-by: Mulin Chao <mlchao@nuvoton.com>

dts/arm/nuvoton/npcx.dtsi

@@ -691,6 +691,12 @@
 			label = "I2C_7_PORT_0";
 			status = "disabled";
 		};
+
+		power_ctrl_psl: power-ctrl-psl {
+			compatible = "nuvoton,npcx-power-psl";
+			label = "POWER_CONTROL_PSL";
+			status = "disabled";
+		};
 	};
 
 	soc-id {

dts/bindings/power/nuvoton,npcx-power-psl.yaml

@@ -0,0 +1,20 @@
+# Copyright (c) 2022 Nuvoton Technology Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+description: Nuvoton, NPCX Power Switch Logic (PSL) control node
+
+compatible: "nuvoton,npcx-power-psl"
+
+include: [base.yaml, pinctrl-device.yaml]
+
+properties:
+  enable-gpios:
+    type: phandle-array
+    required: true
+    description: |
+      GPIO to used to turn on/off the Core Domain power supply (VCC1) of NPCX
+      embedded controller (EC)
+  pinctrl-0:
+    required: true
+  pinctrl-names:
+    required: true