[linux-sunxi] [PATCH v2 07/13] arm64: dts: allwinner: orange-pi-3: Enable ethernet

[megous via linux-sunxi]

From: Ondrej Jirman <meg...@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 <meg...@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 5fbc5e410883..523f1d848042 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 {
@@ -44,6 +45,27 @@
                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 {
@@ -58,6 +80,28 @@
        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";
+};
+
+&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

-- 
You received this message because you are subscribed to the Google Groups 
"linux-sunxi" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
to linux-sunxi+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.