From: Alexey Brodkin <abrodkin@synopsys.com>
Date: Thu, 2 Aug 2018 10:19:37 +0000 (+0300)
Subject: ARC: [plat-axs*/plat-hsdk]: Allow U-Boot to pass MAC-address to the kernel
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=5c0920897af59779546e9ea0e89c5db45c8aff33;p=linux.git

ARC: [plat-axs*/plat-hsdk]: Allow U-Boot to pass MAC-address to the kernel

Otherwise kernel uses random MAC which is not very conveniet.
With that change in place use might set desired MAC in U-Boot
with "setenv ethaddr 11:22:33:44:55:66", save environment and
then from boot to boot the same MAC will be used by the kernel.

One other note for this to happen it's required to pass
board's .dtb in U-Boot's "bootm" command like that:
------------------->8-----------------
bootm 0x82000000 - 0x84000000
------------------->8-----------------

Here 0x82000000 is location of uImage while
0x80000000 is location of either axs10x.dtb or hsdk.dtb
previously loaded from SD-card, USB storage or TFTP server.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: stable@vger.kernel.org # 4.14
Cc: devicetree@vger.kernel.org
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---

diff --git a/arch/arc/boot/dts/axs10x_mb.dtsi b/arch/arc/boot/dts/axs10x_mb.dtsi
index 47b74fbc403c2..37bafd44e36d0 100644
--- a/arch/arc/boot/dts/axs10x_mb.dtsi
+++ b/arch/arc/boot/dts/axs10x_mb.dtsi
@@ -9,6 +9,10 @@
  */
 
 / {
+	aliases {
+		ethernet = &gmac;
+	};
+
 	axs10x_mb {
 		compatible = "simple-bus";
 		#address-cells = <1>;
@@ -68,7 +72,7 @@
 			};
 		};
 
-		ethernet@0x18000 {
+		gmac: ethernet@0x18000 {
 			#interrupt-cells = <1>;
 			compatible = "snps,dwmac";
 			reg = < 0x18000 0x2000 >;
@@ -81,6 +85,7 @@
 			max-speed = <100>;
 			resets = <&creg_rst 5>;
 			reset-names = "stmmaceth";
+			mac-address = [00 00 00 00 00 00]; /* Filled in by U-Boot */
 		};
 
 		ehci@0x40000 {
diff --git a/arch/arc/boot/dts/hsdk.dts b/arch/arc/boot/dts/hsdk.dts
index 006aa3de5348f..d00f283094d31 100644
--- a/arch/arc/boot/dts/hsdk.dts
+++ b/arch/arc/boot/dts/hsdk.dts
@@ -25,6 +25,10 @@
 		bootargs = "earlycon=uart8250,mmio32,0xf0005000,115200n8 console=ttyS0,115200n8 debug print-fatal-signals=1";
 	};
 
+	aliases {
+		ethernet = &gmac;
+	};
+
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
@@ -163,7 +167,7 @@
 			#clock-cells = <0>;
 		};
 
-		ethernet@8000 {
+		gmac: ethernet@8000 {
 			#interrupt-cells = <1>;
 			compatible = "snps,dwmac";
 			reg = <0x8000 0x2000>;
@@ -176,6 +180,7 @@
 			phy-handle = <&phy0>;
 			resets = <&cgu_rst HSDK_ETH_RESET>;
 			reset-names = "stmmaceth";
+			mac-address = [00 00 00 00 00 00]; /* Filled in by U-Boot */
 
 			mdio {
 				#address-cells = <1>;