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diff --git a/Bindings/net/pcs/mediatek,sgmiisys.yaml b/Bindings/net/pcs/mediatek,sgmiisys.yaml
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+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/pcs/mediatek,sgmiisys.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek SGMIISYS Controller
+
+maintainers:
+ - Matthias Brugger <matthias.bgg@gmail.com>
+
+description:
+ The MediaTek SGMIISYS controller provides a SGMII PCS and some clocks
+ to the ethernet subsystem to which it is attached.
+
+properties:
+ compatible:
+ items:
+ - enum:
+ - mediatek,mt7622-sgmiisys
+ - mediatek,mt7629-sgmiisys
+ - mediatek,mt7981-sgmiisys_0
+ - mediatek,mt7981-sgmiisys_1
+ - mediatek,mt7986-sgmiisys_0
+ - mediatek,mt7986-sgmiisys_1
+ - const: syscon
+
+ reg:
+ maxItems: 1
+
+ '#clock-cells':
+ const: 1
+
+ mediatek,pnswap:
+ description: Invert polarity of the SGMII data lanes
+ type: boolean
+
+required:
+ - compatible
+ - reg
+ - '#clock-cells'
+
+additionalProperties: false
+
+examples:
+ - |
+ soc {
+ #address-cells = <2>;
+ #size-cells = <2>;
+ sgmiisys: syscon@1b128000 {
+ compatible = "mediatek,mt7622-sgmiisys", "syscon";
+ reg = <0 0x1b128000 0 0x1000>;
+ #clock-cells = <1>;
+ };
+ };