linux-kernel - [PATCH] arm64: dts: rockchip: Add compatible for Ethernet PHY

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Message-ID: <20251209210658.458506-2-adrian.kossmann@posteo.de>
Date: Tue, 09 Dec 2025 21:09:33 +0000
From: Adrian Kossmann <adrian.kossmann@...teo.de>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>
Cc: Adrian Kossmann <adrian.kossmann@...teo.de>,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] arm64: dts: rockchip: Add compatible for Ethernet PHY

Without the compatible string the Ethernet PHY is not bound to the
correct driver. This causes link instability under load, with throughput
eventually dropping to zero.
Add the explicit PHY ID compatible to ensure the proper driver is selected.

Signed-off-by: Adrian Kossmann <adrian.kossmann@...teo.de>
---
 arch/arm64/boot/dts/rockchip/rk3328-rock-pi-e.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3328-rock-pi-e.dts b/arch/arm64/boot/dts/rockchip/rk3328-rock-pi-e.dts
index a4bdd87d0729..4da5ff6f2572 100644
--- a/arch/arm64/boot/dts/rockchip/rk3328-rock-pi-e.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3328-rock-pi-e.dts
@@ -163,6 +163,7 @@ mdio {
 		#size-cells = <0>;
 
 		rtl8211: ethernet-phy@1 {
+			compatible = "ethernet-phy-id001c.c916";
 			reg = <1>;
 			pinctrl-0 = <&eth_phy_int_pin>, <&eth_phy_reset_pin>;
 			pinctrl-names = "default";
-- 
2.52.0