dts: arm: atmel: refactor to use common parent nodes for sam ethernet

The ethernet mac and mdio share registers, refactor them to have common
parent nodes.

Signed-off-by: Tony Han <[email protected]>

Author: TonyHan11

dts/arm/atmel/sam4e.dtsi

@@ -165,24 +165,26 @@
 			status = "disabled";
 		};
 
-		gmac: ethernet@40034000 {
-			compatible = "atmel,sam-gmac";
+		ethernet@40034000 {
+			compatible = "microchip,sam-ethernet-controller";
 			reg = <0x40034000 0x4000>;
 			clocks = <&pmc PMC_TYPE_PERIPHERAL 44>;
-			interrupts = <44 0>;
-			interrupt-names = "gmac";
-			num-queues = <1>;
-			phy-connection-type = "mii";
-			status = "disabled";
-		};
 
-		mdio: mdio@40034000 {
-			compatible = "atmel,sam-mdio";
-			reg = <0x40034000 0x4000>;
-			clocks = <&pmc PMC_TYPE_PERIPHERAL 44>;
-			status = "disabled";
-			#address-cells = <1>;
-			#size-cells = <0>;
+			gmac: ethernet {
+				compatible = "atmel,sam-gmac";
+				interrupts = <44 0>;
+				interrupt-names = "gmac";
+				num-queues = <1>;
+				phy-connection-type = "mii";
+				status = "disabled";
+			};
+
+			mdio: mdio {
+				compatible = "atmel,sam-mdio";
+				status = "disabled";
+				#address-cells = <1>;
+				#size-cells = <0>;
+			};
 		};
 
 		pinctrl: pinctrl@400e0e00 {

dts/arm/atmel/same5x.dtsi

@@ -10,24 +10,27 @@
 
 / {
 	soc {
-		gmac: ethernet@42000800 {
-			compatible = "atmel,sam0-gmac";
+		ethernet@42000800 {
+			compatible = "microchip,sam-ethernet-controller";
 			reg = <0x42000800 0x400>;
-			interrupts = <84 0>;
-			interrupt-names = "gmac";
-			status = "disabled";
 
-			num-queues = <1>;
-			local-mac-address = [00 00 00 00 00 00];
-		};
+			gmac: ethernet {
+				compatible = "atmel,sam0-gmac";
+				interrupts = <84 0>;
+				interrupt-names = "gmac";
+				status = "disabled";
 
-		mdio: mdio@42000800 {
-			compatible = "atmel,sam-mdio";
-			reg = <0x42000800 0x400>;
-			status = "disabled";
+				num-queues = <1>;
+				local-mac-address = [00 00 00 00 00 00];
+			};
+
+			mdio: mdio {
+				compatible = "atmel,sam-mdio";
+				status = "disabled";
 
-			#address-cells = <1>;
-			#size-cells = <0>;
+				#address-cells = <1>;
+				#size-cells = <0>;
+			};
 		};
 
 		can0: can@42000000 {

dts/arm/atmel/samx7x.dtsi

@@ -232,24 +232,26 @@
 			#io-channel-cells = <1>;
 		};
 
-		gmac: ethernet@40050000 {
-			compatible = "atmel,sam-gmac";
+		ethernet@40050000 {
+			compatible = "microchip,sam-ethernet-controller";
 			reg = <0x40050000 0x4000>;
 			clocks = <&pmc PMC_TYPE_PERIPHERAL 39>;
-			interrupts = <39 0>, <66 0>, <67 0>;
-			interrupt-names = "gmac", "q1", "q2";
-			num-queues = <3>;
-			local-mac-address = [00 00 00 00 00 00];
-			status = "disabled";
-		};
 
-		mdio: mdio@40050000 {
-			compatible = "atmel,sam-mdio";
-			reg = <0x40050000 0x4000>;
-			clocks = <&pmc PMC_TYPE_PERIPHERAL 39>;
-			status = "disabled";
-			#address-cells = <1>;
-			#size-cells = <0>;
+			gmac: ethernet {
+				compatible = "atmel,sam-gmac";
+				interrupts = <39 0>, <66 0>, <67 0>;
+				interrupt-names = "gmac", "q1", "q2";
+				num-queues = <3>;
+				local-mac-address = [00 00 00 00 00 00];
+				status = "disabled";
+			};
+
+			mdio: mdio {
+				compatible = "atmel,sam-mdio";
+				status = "disabled";
+				#address-cells = <1>;
+				#size-cells = <0>;
+			};
 		};
 
 		tc3: tc@40054000 {

dts/bindings/ethernet/atmel,gmac-common.yaml

@@ -7,9 +7,6 @@ include:
   - name: pinctrl-device.yaml
 
 properties:
-  reg:
-    required: true
-
   phy-handle:
     required: true
 

dts/bindings/ethernet/atmel,sam-gmac.yaml

@@ -6,7 +6,3 @@ description: Atmel SAM-family GMAC Ethernet
 compatible: "atmel,sam-gmac"
 
 include: atmel,gmac-common.yaml
-
-properties:
-  clocks:
-    required: true

dts/bindings/ethernet/microchip,sam-ethernet-controller.yaml

@@ -0,0 +1,15 @@
+# Copyright (C) 2025 Microchip Technology Inc. and its subsidiaries
+# SPDX-License-Identifier: Apache-2.0
+
+title: Microchip SAM Ethernet Controller
+
+description: |
+  Contains the Ethernet MAC and the MDIO as child nodes.
+
+compatible: "microchip,sam-ethernet-controller"
+
+include: base.yaml
+
+properties:
+  reg:
+    required: true