ARM: dts: meson8b-odroidc1: ethernet support

The Odroid-C1+ board is equipped with an RTL8211F ethernet PHY
which supports 10/100/1000 Mbps ethernet.
The PHY reset and interrupt lines are controlled by the SoC via
two GPIO lines (GPIOH_4 and GPIOH_3 respectively).
The PHY energy efficient ethernet (eee) mode is marked as broken
using "eee-broken-1000t" because, during tests, high packet losses
were experienced without it.
Signed-off-by: Emiliano Ingrassia <ingrassia@epigenesys.com>
Tested-by: Linus Lüssing <linus.luessing@c0d3.blue>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

arch/arm/boot/dts/meson8b-odroidc1.dts

@@ -99,3 +99,33 @@ &usb1_phy {
 &usb1 {
 	status = "okay";
 };
+
+&ethmac {
+	status = "okay";
+
+	snps,reset-gpio = <&gpio GPIOH_4 GPIO_ACTIVE_HIGH>;
+	snps,reset-active-low;
+	snps,reset-delays-us = <0 10000 30000>;
+
+	pinctrl-0 = <&eth_rgmii_pins>;
+	pinctrl-names = "default";
+
+	phy-mode = "rgmii";
+	phy-handle = <&eth_phy>;
+	amlogic,tx-delay-ns = <4>;
+
+	mdio {
+		compatible = "snps,dwmac-mdio";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		/* Realtek RTL8211F (0x001cc916) */
+		eth_phy: ethernet-phy@0 {
+			reg = <0>;
+			eee-broken-1000t;
+			interrupt-parent = <&gpio_intc>;
+			/* GPIOH_3 */
+			interrupts = <17 IRQ_TYPE_LEVEL_LOW>;
+		};
+	};
+};