[PATCH 4/5] ARM: dts: BCM5301X: Retrieve gmac1 MAC address from NVRAM on Asus RT-AC88U

["Arınç ÜNAL" <arinc.unal@arinc9.com>]

The et1macaddr NVRAM variable contains a MAC address for gmac1 on Asus
RT-AC88U. Add NVMEM cell for it and reference it in the gmac1 node.

The Broadcom GBit BCMA driver will issue the MAC address for gmac{0,1,2}
retrieved from et{0,1,2}mac from SPROM without this but let's explicitly
define it as mac-address on the devicetree.
Refer to drivers/net/ethernet/broadcom/bgmac-bcma.c:147.

Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
---
 arch/arm/boot/dts/bcm47094-asus-rt-ac88u.dts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm/boot/dts/bcm47094-asus-rt-ac88u.dts b/arch/arm/boot/dts/bcm47094-asus-rt-ac88u.dts
index 5696dd5fbaf4..2f944d1c0330 100644
--- a/arch/arm/boot/dts/bcm47094-asus-rt-ac88u.dts
+++ b/arch/arm/boot/dts/bcm47094-asus-rt-ac88u.dts
@@ -25,6 +25,9 @@ memory@0 {
 	nvram@1c080000 {
 		compatible = "brcm,nvram";
 		reg = <0x1c080000 0x00180000>;
+
+		et1macaddr: et1macaddr {
+		};
 	};
 
 	leds {
@@ -239,6 +242,11 @@ fixed-link {
 	};
 };
 
+&gmac1 {
+	nvmem-cells = <&et1macaddr>;
+	nvmem-cell-names = "mac-address";
+};
+
 &usb2 {
 	vcc-gpio = <&chipcommon 9 GPIO_ACTIVE_HIGH>;
 };
-- 
2.25.1