The sync of device-tree/bindings in 11a48a5a18c6 ("Linux 5.6-rc2") causes Ethernet to break on some GXBB boards; the PHY seems to need proper reset timing to function in u-boot and Linux. Re-add the old PHY reset binding for dwmac until we support new bindings in the PHY node. This borrows the same fix applied to the Odroid C2 board [0].

[0] https://lists.denx.de/pipermail/u-boot/2021-April/446658.html

Fixes: dd5f2351e99a ("arm64: dts: meson: sync dt and bindings from v5.6-rc2") Signed-off-by: Christian Hewitt christianshewitt@gmail.com --- arch/arm/dts/meson-gxbb-nanopi-k2-u-boot.dtsi | 7 +++++++ 1 file changed, 7 insertions(+)

diff --git a/arch/arm/dts/meson-gxbb-nanopi-k2-u-boot.dtsi b/arch/arm/dts/meson-gxbb-nanopi-k2-u-boot.dtsi index c35158d7e9..2a245bbe7f 100644 --- a/arch/arm/dts/meson-gxbb-nanopi-k2-u-boot.dtsi +++ b/arch/arm/dts/meson-gxbb-nanopi-k2-u-boot.dtsi @@ -5,3 +5,10 @@ */

#include "meson-gx-u-boot.dtsi" + +&ethmac { + snps,reset-gpio = <&gpio GPIOZ_14 0>; + snps,reset-delays-us = <0 10000 1000000>; + snps,reset-active-low; +}; +