arm: dts: mt7623: add port@5 as CPU port

On the MT7623AI SoC and Bananapi BPI-R2, port 5 of the MT7530 switch is
connected to the second MAC of the SoC as a CPU port. Add the port and set
up the second MAC on the bindings.

Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Link: https://lore.kernel.org/r/20230210182505.24597-6-arinc.unal@arinc9.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

Author: arinc9

arch/arm/boot/dts/mt7623a.dtsi

@@ -28,6 +28,17 @@
 	};
 };
 
+&gmac1 {
+	status = "okay";
+	phy-mode = "rgmii";
+
+	fixed-link {
+		speed = <1000>;
+		full-duplex;
+		pause;
+	};
+};
+
 &eth {
 	status = "okay";
 	power-domains = <&scpsys MT7623A_POWER_DOMAIN_ETH>;
@@ -79,6 +90,19 @@
 					label = "swp4";
 				};
 
+				port@5 {
+					reg = <5>;
+					label = "cpu";
+					ethernet = <&gmac1>;
+					phy-mode = "rgmii";
+
+					fixed-link {
+						speed = <1000>;
+						full-duplex;
+						pause;
+					};
+				};
+
 				port@6 {
 					reg = <6>;
 					label = "cpu";

arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts

@@ -182,6 +182,17 @@
 	};
 };
 
+&gmac1 {
+	status = "okay";
+	phy-mode = "rgmii";
+
+	fixed-link {
+		speed = <1000>;
+		full-duplex;
+		pause;
+	};
+};
+
 &eth {
 	status = "okay";
 
@@ -225,6 +236,19 @@
 					label = "lan3";
 				};
 
+				port@5 {
+					reg = <5>;
+					label = "cpu";
+					ethernet = <&gmac1>;
+					phy-mode = "rgmii";
+
+					fixed-link {
+						speed = <1000>;
+						full-duplex;
+						pause;
+					};
+				};
+
 				port@6 {
 					reg = <6>;
 					label = "cpu";