linux-kernel - [PATCH 2/3] arm64: dts: rockchip: Change gmac phy-mode to rgmii-id for roc-rk3576-pc

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Message-Id: <20260121031548.402-3-kernel@airkyi.com>
Date: Wed, 21 Jan 2026 11:15:47 +0800
From: Chaoyi Chen <kernel@...kyi.com>
To: Andrew Lunn <andrew@...n.ch>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Alexey Charkov <alchark@...il.com>,
	Shawn Lin <shawn.lin@...k-chips.com>,
	Sebastian Reichel <sebastian.reichel@...labora.com>,
	Chaoyi Chen <chaoyi.chen@...k-chips.com>,
	Andy Yan <andy.yan@...k-chips.com>,
	Nicolas Frattaroli <nicolas.frattaroli@...labora.com>,
	Detlev Casanova <detlev.casanova@...labora.com>,
	Stephen Chen <stephen@...xa.com>
Cc: devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] arm64: dts: rockchip: Change gmac phy-mode to rgmii-id for roc-rk3576-pc

From: Chaoyi Chen <chaoyi.chen@...k-chips.com>

According to the description in the net documentation, PHY modes
"rgmii", "rgmii-rxid" and "rgmii-txid" modes require the clock signal
to be delayed on the PCB.

The Rockchip platform has long used the above mentioned PHY modes and
private delay prop to describe the internal IO delay settings of the
chip, which is inconsistent with what is described in the documentation.

Let's describe this part of the delay in the PHY and use the more
reasonable "rgmii-id" mode.

Signed-off-by: Chaoyi Chen <chaoyi.chen@...k-chips.com>
---
 arch/arm64/boot/dts/rockchip/rk3576-roc-pc.dts | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3576-roc-pc.dts b/arch/arm64/boot/dts/rockchip/rk3576-roc-pc.dts
index d0ab1d1e0e11..edef483d37c4 100644
--- a/arch/arm64/boot/dts/rockchip/rk3576-roc-pc.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3576-roc-pc.dts
@@ -275,10 +275,8 @@ &eth0m0_rx_bus2
 		     &eth0m0_rgmii_clk
 		     &eth0m0_rgmii_bus
 		     &ethm0_clk0_25m_out>;
-	/* Use rgmii-rxid mode to disable rx delay inside Soc */
-	phy-mode = "rgmii-rxid";
+	phy-mode = "rgmii-id";
 	phy-handle = <&rgmii_phy0>;
-	tx_delay = <0x21>;
 	status = "okay";
 };
 
@@ -313,6 +311,7 @@ rgmii_phy0: phy@1 {
 		reset-delay-us = <20000>;
 		reset-gpios = <&gpio2 RK_PB5 GPIO_ACTIVE_LOW>;
 		reset-post-delay-us = <100000>;
+		tx-internal-delay-ps = <1950>;
 	};
 };
 
-- 
2.51.1