linux-kernel - [PATCH] arm64: dts: exynos: Add Ethernet node for E850-96 board

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Message-Id: <20250731234532.12903-1-semen.protsenko@linaro.org>
Date: Thu, 31 Jul 2025 18:45:32 -0500
From: Sam Protsenko <semen.protsenko@...aro.org>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>
Cc: Conor Dooley <conor+dt@...nel.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] arm64: dts: exynos: Add Ethernet node for E850-96 board

The E850-96 board has a hard-wired LAN9514 chip which acts as a USB hub
and Ethernet bridge. It's being discovered dynamically when the USB bus
gets enumerated, but the corresponding Ethernet device tree node is
still needed for the bootloader to pass the MAC address through. Add
LAN9514 nodes as described in [1]. 'local-mac-address' property (in the
'ethernet' node) is used for MAC address handover from the bootloader to
Linux.

[1] Documentation/devicetree/bindings/net/microchip,lan95xx.yaml

Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
---
 arch/arm64/boot/dts/exynos/exynos850-e850-96.dts | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/arm64/boot/dts/exynos/exynos850-e850-96.dts b/arch/arm64/boot/dts/exynos/exynos850-e850-96.dts
index 7d70a32e75b2..ab076d326a49 100644
--- a/arch/arm64/boot/dts/exynos/exynos850-e850-96.dts
+++ b/arch/arm64/boot/dts/exynos/exynos850-e850-96.dts
@@ -21,6 +21,7 @@ / {
 	compatible = "winlink,e850-96", "samsung,exynos850";
 
 	aliases {
+		ethernet0 = &ethernet;
 		mmc0 = &mmc_0;
 		serial0 = &serial_0;
 	};
@@ -241,10 +242,24 @@ &usbdrd {
 };
 
 &usbdrd_dwc3 {
+	#address-cells = <1>;
+	#size-cells = <0>;
 	dr_mode = "otg";
 	usb-role-switch;
 	role-switch-default-mode = "host";
 
+	hub@1 {
+		compatible = "usb424,9514";
+		reg = <1>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		ethernet: ethernet@1 {
+			compatible = "usb424,ec00";
+			reg = <1>;
+		};
+	};
+
 	port {
 		usb1_drd_sw: endpoint {
 			remote-endpoint = <&usb_dr_connector>;
-- 
2.39.5