add emac support

arch/arm64/boot/dts/allwinner/sun50i-h618-bananapi-m4zero.dts

@@ -61,6 +61,22 @@
 		regulator-max-microvolt = <5000000>;
 		regulator-always-on;
 	};
+
+	ac200_pwm_clk: ac200_clk {
+		compatible = "pwm-clock";
+		#clock-cells = <0>;
+		// pwm5 period_ns = 500 > 334 for select 24M clock.
+		pwms = <&pwm 5 500 0>;
+		clock-frequency = <2000000>;
+		status = "okay";
+	};
+};
+
+&pwm5 {
+	// clk_bypass_output = 1 for Clock direct output without frequency division
+	// so pwm5 output is 24MHz for AC200 & AC300 clock
+	clk_bypass_output = <0x1>;
+	status = "okay";
 };
 
 &de {
@@ -251,7 +267,23 @@
 };
 
 &i2c3 {
-	status = "disabled";
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&i2c3_pa_pins>;
+
+	ac200_x: mfd@10 {
+		compatible = "x-powers,ac200";
+		reg = <0x10>;
+		clocks = <&ac200_pwm_clk>;
+		// ephy id
+		nvmem-cells = <&ephy_calibration>;
+		nvmem-cell-names = "calibration";
+
+		ac200_ephy: phy {
+			compatible = "x-powers,ac200-ephy";
+			status = "okay";
+		};
+	};
 };
 
 &i2c4 {