[PATCH 1/2] arm64: dts: meson-gxbb-odroidc2: read the Ethernet MAC address from eFuse

[Fil Dunsky via B4 Relay]

From: Fil Dunsky <filipp.dunsky@xxxxxxxxx>

The vendor programs a unique factory MAC address into the SoC eFuse at
offset 0x34, which is exactly the eth_mac nvmem cell that meson-gx.dtsi
already describes.  Reference the cell from the Ethernet controller so
the kernel picks up the factory address itself instead of depending on
the bootloader to populate local-mac-address, or falling back to a
random one when it does not.

Verified on an ODROID-C2 booted with a mainline U-Boot that does not
set ethaddr: the interface comes up with the factory MAC address.

Signed-off-by: Fil Dunsky <filipp.dunsky@xxxxxxxxx>
---
 arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts b/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts
index 5943bc810..639b97ad5 100644
--- a/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts
+++ b/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts
@@ -230,6 +230,9 @@ &ethmac {
 	phy-handle = <&eth_phy0>;
 	phy-mode = "rgmii";
 
+	nvmem-cells = <&eth_mac>;
+	nvmem-cell-names = "mac-address";
+
 	amlogic,tx-delay-ns = <2>;
 
 	mdio {

-- 
2.53.0