arm64: dts: st: enable Ethernet2 on stm32mp257f-ev1 board

ETHERNET2 instance is connected to Realtek PHY in RGMII mode
Ethernet is SNSP IP with GMAC5 version.

Signed-off-by: Christophe Roullier <[email protected]>
Reviewed-by: Marek Vasut <[email protected]>
Signed-off-by: Alexandre Torgue <[email protected]>

Author: Christophe Roullier

arch/arm64/boot/dts/st/stm32mp257f-ev1.dts

@@ -17,6 +17,7 @@
 	compatible = "st,stm32mp257f-ev1", "st,stm32mp257";
 
 	aliases {
+		ethernet0 = &ethernet2;
 		serial0 = &usart2;
 		serial1 = &usart6;
 	};
@@ -56,6 +57,29 @@
 	status = "okay";
 };
 
+&ethernet2 {
+	pinctrl-names = "default", "sleep";
+	pinctrl-0 = <&eth2_rgmii_pins_a>;
+	pinctrl-1 = <&eth2_rgmii_sleep_pins_a>;
+	max-speed = <1000>;
+	phy-handle = <&phy0_eth2>;
+	phy-mode = "rgmii-id";
+	status = "okay";
+
+	mdio {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		compatible = "snps,dwmac-mdio";
+		phy0_eth2: ethernet-phy@1 {
+			compatible = "ethernet-phy-id001c.c916";
+			reg = <1>;
+			reset-assert-us = <10000>;
+			reset-deassert-us = <300>;
+			reset-gpios =  <&gpiog 6 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
+
 &i2c2 {
 	pinctrl-names = "default", "sleep";
 	pinctrl-0 = <&i2c2_pins_a>;