The dwmac-sun8i  hardware is present on the BananaPi M64.
It uses an external PHY rtl8211e via RGMII.

Signed-off-by: Corentin Labbe <clabbe.montj...@gmail.com>
---
 arch/arm64/boot/dts/allwinner/sun50i-a64-bananapi-m64.dts | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-bananapi-m64.dts 
b/arch/arm64/boot/dts/allwinner/sun50i-a64-bananapi-m64.dts
index 6872135..347c262 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-a64-bananapi-m64.dts
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-bananapi-m64.dts
@@ -77,6 +77,20 @@
        bias-pull-up;
 };
 
+&mdio {
+       ext_rgmii_phy: ethernet-phy@1 {
+               reg = <1>;
+       };
+};
+
+&emac {
+       pinctrl-names = "default";
+       pinctrl-0 = <&rgmii_pins>;
+       phy-mode = "rgmii";
+       phy-handle = <&ext_rgmii_phy>;
+       status = "okay";
+};
+
 &mmc0 {
        pinctrl-names = "default";
        pinctrl-0 = <&mmc0_pins>;
-- 
2.10.2

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