dts: kscan: npcx: add the kscan node and binding

- Add kscan node to npcx.dtsi.
- Add yaml binding for npcx kscan.

Signed-off-by: Mulin Chao <mlchao@nuvoton.com>
Signed-off-by: Jun Lin <CHLin56@nuvoton.com>

dts/bindings/kscan/nuvoton,npcx-kscan.yaml

@@ -0,0 +1,63 @@
+# Copyright (c) 2022 Nuvoton Technology Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+description: Nuvoton, NPCX keyboard scan controller
+
+compatible: "nuvoton,npcx-kscan"
+
+include: [kscan.yaml, pinctrl-device.yaml]
+
+properties:
+    reg:
+        required: true
+
+    clocks:
+        required: true
+
+    pinctrl-0:
+        required: true
+
+    pinctrl-names:
+        required: true
+
+    wui-maps:
+        type: phandles
+        required: true
+        description: |
+            Mapping table between Wake-Up Input (WUI) and KSIs.
+
+            For example the WUI mapping on 8 KSI pads would be
+               wui-maps = <&wui_io30 &wui_io31 &wui_io27 &wui_io26
+                           &wui_io25 &wui_io24 &wui_io23 &wui_io22>;
+
+    row-size:
+        type: int
+        default: 8
+        required: true
+        description: |
+            The row size is used in the keyboard matrix.
+            valid range: 1 - 8
+
+    col-size:
+        type: int
+        default: 18
+        required: true
+        description: |
+            The column size is used in the keyboard matrix.
+            valid range: 1 - 18
+
+    debounce-down-ms:
+        type: int
+        default: 10
+        description: Determines the time in msecs for debouncing a key press.
+
+    debounce-up-ms:
+        type: int
+        default: 20
+        description: Determines the time in msecs for debouncing a key release.
+
+    no-ghostkey-check:
+        type: boolean
+        description: |
+            Ignore the ghost key checking in the driver if the diodes are used
+            in the matrix hardware.