--- /dev/null
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/arm/mediatek/mediatek,mmsys.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: MediaTek mmsys controller
+
+maintainers:
+ - Matthias Brugger <matthias.bgg@gmail.com>
+
+description:
+ The MediaTek mmsys system controller provides clock control, routing control,
+ and miscellaneous control in mmsys partition.
+
+properties:
+ $nodename:
+ pattern: "^syscon@[0-9a-f]+$"
+
+ compatible:
+ oneOf:
+ - items:
+ - enum:
+ - mediatek,mt2701-mmsys
+ - mediatek,mt2712-mmsys
+ - mediatek,mt6765-mmsys
+ - mediatek,mt6779-mmsys
+ - mediatek,mt6797-mmsys
+ - mediatek,mt8167-mmsys
+ - mediatek,mt8173-mmsys
+ - mediatek,mt8183-mmsys
++ - mediatek,mt8192-mmsys
+ - mediatek,mt8365-mmsys
+ - const: syscon
+ - items:
+ - const: mediatek,mt7623-mmsys
+ - const: mediatek,mt2701-mmsys
+ - const: syscon
+
+ reg:
+ maxItems: 1
+
+ "#clock-cells":
+ const: 1
+
+required:
+ - compatible
+ - reg
+ - "#clock-cells"
+
+additionalProperties: false
+
+examples:
+ - |
+ mmsys: syscon@14000000 {
+ compatible = "mediatek,mt8173-mmsys", "syscon";
+ reg = <0x14000000 0x1000>;
+ #clock-cells = <1>;
+ };