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Subject[PATCH 6/6] 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
PHY. According to the datasheet, both regulators need to be enabled
at the same time, or that "phy-io" should be enabled slightly earlier
than "phy" regulator.

RTL8211E/RTL8211EG datasheet says:

Note 4: 2.5V (or 1.8/1.5V) RGMII power should be risen simultaneously
or slightly earlier than 3.3V power. Rising 2.5V (or 1.8/1.5V) power
later than 3.3V power may lead to errors.

The driver ensures the regulator enable ordering. The timing is set
in DT via startup-delay-us.

We also need to wait at least 30ms after power-up/reset, before
accessing the PHY registers.

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

Signed-off-by: Ondrej Jirman <megous@megous.com>
---
.../dts/allwinner/sun50i-h6-orangepi-3.dts | 40 +++++++++++++++++++
1 file changed, 40 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 eda9d5f640b9..18349e60b8c6 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 {
@@ -56,6 +57,15 @@
regulator-max-microvolt = <5000000>;
regulator-always-on;
};
+
+ reg_gmac_2v5: gmac-2v5 {
+ compatible = "regulator-fixed";
+ regulator-name = "gmac-2v5";
+ regulator-min-microvolt = <2500000>;
+ regulator-max-microvolt = <2500000>;
+ enable-active-high;
+ gpio = <&pio 3 6 GPIO_ACTIVE_HIGH>; /* PD6 */
+ };
};

&cpu0 {
@@ -74,6 +84,35 @@
status = "okay";
};

+&emac {
+ pinctrl-names = "default";
+ pinctrl-0 = <&ext_rgmii_pins>;
+ phy-mode = "rgmii";
+ phy-handle = <&ext_rgmii_phy>;
+ /*
+ * 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. The driver enables phy-io
+ * first. Delay is achieved with enable-ramp-delay on reg_aldo2.
+ */
+ phy-supply = <&reg_aldo2>;
+ phy-io-supply = <&reg_gmac_2v5>;
+ allwinner,rx-delay-ps = <1500>;
+ allwinner,tx-delay-ps = <700>;
+ status = "okay";
+};
+
+&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>;
+ };
+};
+
&hdmi {
status = "okay";
};
@@ -136,6 +175,7 @@
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
regulator-name = "vcc33-audio-tv-ephy-mac";
+ regulator-enable-ramp-delay = <100000>;
};

/* ALDO3 is shorted to CLDO1 */
--
2.22.1
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