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Subject[PATCH 07/12] arm64: dts: allwinner: orange-pi-3: Enable ethernet
Date
From: Ondrej Jirman <megous@megous.com>

Orange Pi 3 has two regulators that power the Realtek RTL8211E.
According to the phy datasheet, both regulators need to be enabled
at the same time, but we can only specify a single phy-supply in
the DT.

This can be achieved by making one regulator depedning on the
other via vin-supply. While it's not a technically correct
description of the hardware, it achieves the purpose.

All values of RX/TX delay were tested exhaustively and a middle
one of the working values was chosen.

Signed-off-by: Ondrej Jirman <megous@megous.com>
---
.../dts/allwinner/sun50i-h6-orangepi-3.dts | 44 +++++++++++++++++++
1 file changed, 44 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-3.dts b/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-3.dts
index 644946749088..5270142527f5 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-3.dts
+++ b/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi-3.dts
@@ -15,6 +15,7 @@

aliases {
serial0 = &uart0;
+ ethernet0 = &emac;
};

chosen {
@@ -64,6 +65,27 @@
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-3V3 (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>; /* 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>; /* GMAC-3V3 */
+ };
};

&cpu0 {
@@ -82,6 +104,17 @@
status = "okay";
};

+&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>;
+ status = "okay";
+};
+
&hdmi {
ddc-supply = <&reg_ddc>;
status = "okay";
@@ -93,6 +126,17 @@
};
};

+&mdio {
+ ext_rgmii_phy: ethernet-phy@1 {
+ compatible = "ethernet-phy-ieee802.3-c22";
+ reg = <1>;
+
+ reset-gpios = <&pio 3 14 GPIO_ACTIVE_LOW>; /* PD14 */
+ reset-assert-us = <15000>;
+ reset-deassert-us = <40000>;
+ };
+};
+
&mmc0 {
pinctrl-names = "default";
pinctrl-0 = <&mmc0_pins>;
--
2.21.0
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