dt-bindings: leds: mt6370: Add MediaTek MT6370 current sink type LED indicator

Add MediaTek MT6370 current sink type LED indicator 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/27df85c30277a171ae85ff6d5b7d867625765d0a.1663926551.git.chiaen_wu@richtek.comSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/leds/mediatek,mt6370-indicator.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/mediatek,mt6370-indicator.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: LED driver for MT6370 PMIC from MediaTek Integrated.
+
+maintainers:
+  - Alice Chen <alice_chen@richtek.com>
+
+description: |
+  This module is part of the MT6370 MFD device.
+  Add MT6370 LED driver include 4-channel RGB LED support Register/PWM/Breath Mode
+
+allOf:
+  - $ref: leds-class-multicolor.yaml#
+
+properties:
+  compatible:
+    const: mediatek,mt6370-indicator
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+patternProperties:
+  "^multi-led@[0-3]$":
+    type: object
+
+    properties:
+      reg:
+        enum: [0, 1, 2, 3]
+
+      "#address-cells":
+        const: 1
+
+      "#size-cells":
+        const: 0
+
+    patternProperties:
+      "^led@[0-2]$":
+        type: object
+        $ref: common.yaml#
+        unevaluatedProperties: false
+
+        properties:
+          reg:
+            enum: [0, 1, 2]
+
+        required:
+          - reg
+          - color
+
+    required:
+      - reg
+      - color
+      - "#address-cells"
+      - "#size-cells"
+
+  "^led@[0-3]$":
+    type: object
+    $ref: common.yaml#
+    unevaluatedProperties: false
+
+    properties:
+      reg:
+        enum: [0, 1, 2, 3]
+
+    required:
+      - reg
+      - color
+
+required:
+  - compatible
+  - "#address-cells"
+  - "#size-cells"
+
+additionalProperties: false