dt-bindings: usb: Add MediaTek MT6370 TCPC

Add MediaTek MT6370 TCPC binding documentation.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Signed-off-by: ChiaEn Wu <chiaen_wu@richtek.com>
Link: https://lore.kernel.org/r/20220815090125.27705-2-peterwu.pub@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/usb/mediatek,mt6370-tcpc.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/usb/mediatek,mt6370-tcpc.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: MediatTek MT6370 Type-C Port Switch and Power Delivery controller
+
+maintainers:
+  - ChiYuan Huang <cy_huang@richtek.com>
+
+description: |
+  MediaTek MT6370 is a multi-functional device.
+  It integrates charger, ADC, flash, RGB indicators,
+  regulators (DSV/VIBLDO), and TypeC Port Switch with Power Delivery controller.
+  This document only describes MT6370 Type-C Port Switch and
+  Power Delivery controller.
+
+properties:
+  compatible:
+    enum:
+      - mediatek,mt6370-tcpc
+
+  interrupts:
+    maxItems: 1
+
+  connector:
+    type: object
+    $ref: /schemas/connector/usb-connector.yaml#
+    unevaluatedProperties: false
+
+additionalProperties: false
+
+required:
+  - compatible
+  - interrupts