[PATCH] ARM: dts: BCM5301X: N18U: set WAN MAC from nvram

The WAN MAC is offset by 1. Set in dts to avoid having to handle this in
userspace.

nvram size found from a random bootlog online.

Signed-off-by: Rosen Penev <[email protected]>
---
 .../dts/broadcom/bcm47081-asus-rt-n18u.dts    | 55 +++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/arch/arm/boot/dts/broadcom/bcm47081-asus-rt-n18u.dts b/arch/arm/boot/dts/broadcom/bcm47081-asus-rt-n18u.dts
index 3854db0118a9..5472d7e13aed 100644
--- a/arch/arm/boot/dts/broadcom/bcm47081-asus-rt-n18u.dts
+++ b/arch/arm/boot/dts/broadcom/bcm47081-asus-rt-n18u.dts
@@ -25,6 +25,15 @@ memory@0 {
 		      <0x88000000 0x08000000>;
 	};
 
+	nvram@1c080000 {
+		compatible = "brcm,nvram";
+		reg = <0x1c080000 0x180000>;
+
+		et0macaddr: et0macaddr {
+			#nvmem-cell-cells = <1>;
+		};
+	};
+
 	leds {
 		compatible = "gpio-leds";
 
@@ -77,3 +86,49 @@ button-wps {
 &usb3_phy {
 	status = "okay";
 };
+
+&gmac0 {
+	nvmem-cells = <&et0macaddr 0>;
+	nvmem-cell-names = "mac-address";
+};
+
+&srab {
+	status = "okay";
+
+	ports {
+		port@0 {
+			label = "wan";
+
+			nvmem-cells = <&et0macaddr 1>;
+			nvmem-cell-names = "mac-address";
+		};
+
+		port@1 {
+			label = "lan1";
+		};
+
+		port@2 {
+			label = "lan2";
+		};
+
+		port@3 {
+			label = "lan3";
+		};
+
+		port@4 {
+			label = "lan4";
+		};
+
+		port@5 {
+			label = "cpu";
+		};
+
+		port@7 {
+			status = "disabled";
+		};
+
+		port@8 {
+			status = "disabled";
+		};
+	};
+};
-- 
2.55.0