linux-kernel - [PATCH] MIPS: Loongson64: dts: fix phy-related definition of LS7A GMAC

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Message-ID: <20260102155243.3639731-1-zhengxingda@iscas.ac.cn>
Date: Fri,  2 Jan 2026 23:52:43 +0800
From: Icenowy Zheng <zhengxingda@...as.ac.cn>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Huacai Chen <chenhuacai@...nel.org>,
	Jiaxun Yang <jiaxun.yang@...goat.com>
Cc: devicetree@...r.kernel.org,
	linux-mips@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Icenowy Zheng <zhengxingda@...as.ac.cn>
Subject: [PATCH] MIPS: Loongson64: dts: fix phy-related definition of LS7A GMAC

Currently the LS7A GMAC device tree node lacks a proper phy-handle
property pointing to the PHY node.

In addition, the phy-mode property specifies "rgmii" without any
internal delay information, which means the board trace needs to add 2ns
delay to the RGMII data lines; but that isn't known to happen on any
Loongson board. The ACPI-based initialization codepath, which is used on
LoongArch-based 3A5000 + 7A1000 hardwares, specifies "rgmii-id" phy
mode, which should be the one we are using.

Add the lacking phy-handle property and set proper phy-mode.

Tested on a LS3A4000_7A1000_NUC_BOARD_V2.1 board with YT8521S PHY.

Signed-off-by: Icenowy Zheng <zhengxingda@...as.ac.cn>
---
 arch/mips/boot/dts/loongson/ls7a-pch.dtsi | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/mips/boot/dts/loongson/ls7a-pch.dtsi b/arch/mips/boot/dts/loongson/ls7a-pch.dtsi
index ee71045883e7e..6dee85909f5a6 100644
--- a/arch/mips/boot/dts/loongson/ls7a-pch.dtsi
+++ b/arch/mips/boot/dts/loongson/ls7a-pch.dtsi
@@ -199,7 +199,8 @@ gmac@3,0 {
 					     <13 IRQ_TYPE_LEVEL_HIGH>;
 				interrupt-names = "macirq", "eth_lpi";
 				interrupt-parent = <&pic>;
-				phy-mode = "rgmii";
+				phy-mode = "rgmii-id";
+				phy-handle = <&phy0>;
 				mdio {
 					#address-cells = <1>;
 					#size-cells = <0>;
@@ -222,7 +223,8 @@ gmac@3,1 {
 					     <15 IRQ_TYPE_LEVEL_HIGH>;
 				interrupt-names = "macirq", "eth_lpi";
 				interrupt-parent = <&pic>;
-				phy-mode = "rgmii";
+				phy-mode = "rgmii-id";
+				phy-handle = <&phy1>;
 				mdio {
 					#address-cells = <1>;
 					#size-cells = <0>;
-- 
2.52.0