arm64: dts: rockchip: add gmac for ROCK 4C+ (radxa#17)

Signed-off-by: FUKAUMI Naoki <naoki@radxa.com>

Signed-off-by: FUKAUMI Naoki <naoki@radxa.com>

Author: RadxaNaoki

arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4c-plus.dts

@@ -24,6 +24,26 @@
 		stdout-path = "serial2:1500000n8";
 	};
 
+	clkin_gmac: external-gmac-clock {
+		compatible = "fixed-clock";
+		clock-frequency = <125000000>;
+		clock-output-names = "clkin_gmac";
+		#clock-cells = <0>;
+	};
+
+	vcc_lan: vcc3v3-phy-regulator {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc_lan";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+
+		regulator-state-mem {
+			regulator-off-in-suspend;
+		};
+	};
+
 	vcc5v0_sys: vcc-sys {
 		compatible = "regulator-fixed";
 		regulator-name = "vcc5v0_sys";
@@ -101,6 +121,22 @@
 	cpu-supply = <&vdd_cpu_b>;
 };
 
+&gmac {
+	assigned-clocks = <&cru SCLK_RMII_SRC>;
+	assigned-clock-parents = <&clkin_gmac>;
+	clock_in_out = "input";
+	phy-supply = <&vcc_lan>;
+	phy-mode = "rgmii";
+	pinctrl-names = "default";
+	pinctrl-0 = <&rgmii_pins>;
+	snps,reset-gpio = <&gpio3 RK_PB7 GPIO_ACTIVE_LOW>;
+	snps,reset-active-low;
+	snps,reset-delays-us = <0 10000 50000>;
+	tx_delay = <0x28>;
+	rx_delay = <0x11>;
+	status = "okay";
+};
+
 &i2c0 {
 	status = "okay";
 	i2c-scl-falling-time-ns = <30>;