[PATCH v2] arm64: allwinner: h6: orangepi-one-plus: Add Ethernet support

[Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>]

Add Ethernet support for orangepi-one-plus board,

- Ethernet port connected via RTL8211E PHY
- PHY suppiled with
  GMAC-2V5, fixed regulator with GMAC_EN pin via PD6
  GMAC-3V, which is supplied by VCC3V3-MAC via aldo2
- RGMII-RESET pin connected via PD14

Signed-off-by: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>
---
Changes for v2:
- emac changes on top of https://patchwork.kernel.org/cover/10899529/
  series

 .../allwinner/sun50i-h6-orangepi-one-plus.dts |  8 ++++
 .../dts/allwinner/sun50i-h6-orangepi.dtsi     | 42 +++++++++++++++++++
 2 files changed, 50 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-one-plus.dts b/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-one-plus.dts
index 12e17567ab56..9e8ed1053715 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-one-plus.dts
+++ b/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-one-plus.dts
@@ -9,4 +9,12 @@
 / {
 	model = "OrangePi One Plus";
 	compatible = "xunlong,orangepi-one-plus", "allwinner,sun50i-h6";
+
+	aliases {
+		ethernet0 = &emac;
+	};
+};
+
+&emac {
+	status = "okay";
 };
diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi.dtsi
index 62e27948a3fa..c48e24acaf8a 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi.dtsi
@@ -45,6 +45,48 @@
 		regulator-max-microvolt = <5000000>;
 		regulator-always-on;
 	};
+
+	/*
+	 * The board uses 2.5V RGMII signalling. Power sequence to enable
+	 * the phy is to enable GMAC-2V5 and GMAC-3V (aldo2) power rails
+	 * at the same time and to wait 100ms.
+	 */
+	reg_gmac_2v5: gmac-2v5 {
+		compatible = "regulator-fixed";
+		regulator-name = "gmac-2v5";
+		regulator-min-microvolt = <2500000>;
+		regulator-max-microvolt = <2500000>;
+		startup-delay-us = <100000>;
+		enable-active-high;
+		gpio = <&pio 3 6 GPIO_ACTIVE_HIGH>; /* GMAC_EN: PD6 */
+
+		/* The real parent of gmac-2v5 is reg_vcc5v, but we need to
+		 * enable two regulators to power the phy. This is one way
+		 * to achieve that.
+		 */
+		vin-supply = <&reg_aldo2>; /* VCC3V3-MAC: GMAC-3V */
+	};
+};
+
+&emac {
+	pinctrl-names = "default";
+	pinctrl-0 = <&ext_rgmii_pins>;
+	phy-mode = "rgmii";
+	phy-handle = <&ext_rgmii_phy>;
+	phy-supply = <&reg_gmac_2v5>;
+	allwinner,rx-delay-ps = <1500>;
+	allwinner,tx-delay-ps = <700>;
+};
+
+&mdio {
+	ext_rgmii_phy: ethernet-phy@1 {
+		compatible = "ethernet-phy-ieee802.3-c22";
+		reg = <1>;
+
+		reset-gpios = <&pio 3 14 GPIO_ACTIVE_LOW>; /* RGMII-RESET: PD14 */
+		reset-assert-us = <15000>;
+		reset-deassert-us = <40000>;
+	};
 };
 
 &ehci0 {
-- 
2.18.0.321.gffc6fa0e3