dt-bindings: net: dsa: add MT7628 ESW

Add device tree bindings for the MediaTek MT7628 embedded Ethernet
Switch.

The Switch provides 5 external user ports and 1 internal CPU port, with
integrated 10/100 PHYs and fixed port to PHY mapping.

The CPU port is internally connected and uses port index 6.

Signed-off-by: Joris Vaisvila <joey@tinyisr.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260813190241.789323-2-joey@tinyisr.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Documentation/devicetree/bindings/net/dsa/mediatek,mt7628-esw.yaml

@@ -0,0 +1,96 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/dsa/mediatek,mt7628-esw.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Mediatek MT7628 Embedded Ethernet Switch
+
+maintainers:
+  - Joris Vaisvila <joey@tinyisr.com>
+
+description:
+  The MT7628 SoC's built-in Ethernet Switch has five user ports and one
+  internally connected CPU port. The user ports are all connected to the SoC's
+  integrated Fast Ethernet PHYs. The switch registers are directly mapped in
+  the SoC's memory.
+
+allOf:
+  - $ref: dsa.yaml#/$defs/ethernet-ports
+
+properties:
+  compatible:
+    const: mediatek,mt7628-esw
+
+  reg:
+    maxItems: 1
+
+  resets:
+    items:
+      - description: internal switch block reset
+      - description: internal phy package reset
+
+  reset-names:
+    items:
+      - const: esw
+      - const: ephy
+
+required:
+  - compatible
+  - reg
+  - resets
+  - reset-names
+  - ethernet-ports
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    switch@10110000 {
+        compatible = "mediatek,mt7628-esw";
+        reg = <0x10110000 0x8000>;
+
+        resets = <&sysc 23>, <&sysc 24>;
+        reset-names = "esw", "ephy";
+
+        ethernet-ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            ethernet-port@0 {
+                reg = <0>;
+                phy-mode = "internal";
+            };
+
+            ethernet-port@1 {
+                reg = <1>;
+                phy-mode = "internal";
+            };
+
+            ethernet-port@2 {
+                reg = <2>;
+                phy-mode = "internal";
+            };
+
+            ethernet-port@3 {
+                reg = <3>;
+                phy-mode = "internal";
+            };
+
+            ethernet-port@4 {
+                reg = <4>;
+                phy-mode = "internal";
+            };
+
+            ethernet-port@6 {
+                reg = <6>;
+                phy-mode = "internal";
+                ethernet = <&ethernet>;
+
+                fixed-link {
+                    speed = <1000>;
+                    full-duplex;
+                };
+            };
+        };
+    };