linux-kernel - [PATCH 3/4] arm64: zynqmp: Describe ethernet controllers via aliases on SOM

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Message-ID: <72304150f87fd5e3338e31e2be8cf5d29955cc02.1756799774.git.michal.simek@amd.com>
Date: Tue, 2 Sep 2025 09:56:20 +0200
From: Michal Simek <michal.simek@....com>
To: <linux-kernel@...r.kernel.org>, <monstr@...str.eu>,
	<michal.simek@...inx.com>, <git@...inx.com>
CC: Conor Dooley <conor+dt@...nel.org>, Krzysztof Kozlowski
	<krzk+dt@...nel.org>, Rob Herring <robh@...nel.org>, "open list:OPEN FIRMWARE
 AND FLATTENED DEVICE TREE BINDINGS" <devicetree@...r.kernel.org>, "moderated
 list:ARM/ZYNQ ARCHITECTURE" <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH 3/4] arm64: zynqmp: Describe ethernet controllers via aliases on SOM

Add ethernet aliases to CC (Carrier card) description to create a
connection which is used by U-BOOT (fdt_fixup_ethernet()) for updating
local-mac-address in DT.
On Kria SOM MAC address is read from i2c eeprom at start and based on it
environment variables are created. Without creating aliases U-Boot is not
able to inject local-mac-address DT property and OS won't get the same MAC
address unless another i2c read is happening in OS.
Also aliases are using string not phandle (because of dtso) that's why full
path has to be provided but that shouldn't be a big issue because location
of ethernet controller is fixed.

Signed-off-by: Michal Simek <michal.simek@....com>
---

 arch/arm64/boot/dts/xilinx/zynqmp-sck-kr-g-revB.dtso | 5 +++++
 arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revA.dtso | 4 ++++
 arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revB.dtso | 4 ++++
 3 files changed, 13 insertions(+)

diff --git a/arch/arm64/boot/dts/xilinx/zynqmp-sck-kr-g-revB.dtso b/arch/arm64/boot/dts/xilinx/zynqmp-sck-kr-g-revB.dtso
index b7cda216b179..99ad220d13d6 100644
--- a/arch/arm64/boot/dts/xilinx/zynqmp-sck-kr-g-revB.dtso
+++ b/arch/arm64/boot/dts/xilinx/zynqmp-sck-kr-g-revB.dtso
@@ -20,6 +20,11 @@
 		     "xlnx,zynqmp-sk-kr260", "xlnx,zynqmp";
 	model = "ZynqMP KR260 revB";
 
+	aliases {
+		ethernet0 = "/axi/ethernet@...b0000"; /* &gem0 */
+		ethernet1 = "/axi/ethernet@...c0000"; /* &gem1 */
+	};
+
 	ina260-u14 {
 		compatible = "iio-hwmon";
 		io-channels = <&u14 0>, <&u14 1>, <&u14 2>;
diff --git a/arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revA.dtso b/arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revA.dtso
index a98a888d1385..3c36eb52e968 100644
--- a/arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revA.dtso
+++ b/arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revA.dtso
@@ -28,6 +28,10 @@
 		     "xlnx,zynqmp-sk-kv260", "xlnx,zynqmp";
 	model = "ZynqMP KV260 revA";
 
+	aliases {
+		ethernet0 = "/axi/ethernet@...e0000"; /* &gem3 */
+	};
+
 	ina260-u14 {
 		compatible = "iio-hwmon";
 		io-channels = <&u14 0>, <&u14 1>, <&u14 2>;
diff --git a/arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revB.dtso b/arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revB.dtso
index 1d2b46d7949e..a4ae37ebaccf 100644
--- a/arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revB.dtso
+++ b/arch/arm64/boot/dts/xilinx/zynqmp-sck-kv-g-revB.dtso
@@ -23,6 +23,10 @@
 		     "xlnx,zynqmp-sk-kv260", "xlnx,zynqmp";
 	model = "ZynqMP KV260 revB";
 
+	aliases {
+		ethernet0 = "/axi/ethernet@...e0000"; /* &gem3 */
+	};
+
 	ina260-u14 {
 		compatible = "iio-hwmon";
 		io-channels = <&u14 0>, <&u14 1>, <&u14 2>;
-- 
2.43.0