linux-kernel - [PATCH] arm64: dts: ti: k3-am62d2-evm: Fix missing RX delay for DP83867 PHY

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Message-ID: <20260120061335.1497832-1-s-vadapalli@ti.com>
Date: Tue, 20 Jan 2026 11:43:24 +0530
From: Siddharth Vadapalli <s-vadapalli@...com>
To: <nm@...com>, <vigneshr@...com>, <kristo@...nel.org>, <robh@...nel.org>,
	<krzk+dt@...nel.org>, <conor+dt@...nel.org>, <bb@...com>, <afd@...com>,
	<p-bhagat@...com>
CC: <stable@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<srk@...com>, <s-vadapalli@...com>
Subject: [PATCH] arm64: dts: ti: k3-am62d2-evm: Fix missing RX delay for DP83867 PHY

MAC Ports 1 and 2 of the CPSW3G Ethernet Switch in the AM62D2 SoC are both
connected to different instances of the DP83867 Ethernet PHY on the AM62D2
EVM, with the 'phy-mode' set to 'rgmii-id'. The DP83867 Ethernet PHY has to
add a 2 nanosecond delay on receive (from wire) based on the EVM design.

Since the device driver for the DP83867 Ethernet PHY coincidentally assumes
that the a 2 nanosecond receive delay has to be added in the absence of the
'ti,rx-internal-delay' property, Ethernet is functional.

However, since the device-tree is intended to describe the Hardware, and,
the device driver for the DP83867 Ethernet PHY may change in the future,
add the 'ti,rx-internal-delay' property and assign it the value
'DP83867_RGMIIDCTL_2_00_NS' which corresponds to a 2 nanosecond
delay.

Fixes: 1544bca2f188 ("arm64: dts: ti: Add support for AM62D2-EVM")
Cc: <stable@...r.kernel.org>
Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
---

Hello,

This patch is based on commit
24d479d26b25 Linux 6.19-rc6
of Mainline Linux.

Patch has been tested on the AM62D2 EVM verifying Ethernet functionality in
the form of NFS (Network File System) mounted using the CPSW3G Ethernet
interface 'eth0'. Test Logs:
https://gist.github.com/Siddharth-Vadapalli-at-TI/04c51da22c0a05f7fc930afc98997571

Regards,
Siddharth.

 arch/arm64/boot/dts/ti/k3-am62d2-evm.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am62d2-evm.dts b/arch/arm64/boot/dts/ti/k3-am62d2-evm.dts
index 2b233bc0323d..17c64af4f97b 100644
--- a/arch/arm64/boot/dts/ti/k3-am62d2-evm.dts
+++ b/arch/arm64/boot/dts/ti/k3-am62d2-evm.dts
@@ -649,12 +649,14 @@ &cpsw3g_mdio {

 	cpsw3g_phy0: ethernet-phy@0 {
 		reg = <0>;
+		ti,rx-internal-delay = <DP83867_RGMIIDCTL_2_00_NS>;
 		ti,fifo-depth = <DP83867_PHYCR_FIFO_DEPTH_4_B_NIB>;
 		ti,min-output-impedance;
 	};

 	cpsw3g_phy1: ethernet-phy@3 {
 		reg = <3>;
+		ti,rx-internal-delay = <DP83867_RGMIIDCTL_2_00_NS>;
 		ti,fifo-depth = <DP83867_PHYCR_FIFO_DEPTH_4_B_NIB>;
 		ti,min-output-impedance;
 	};
-- 
2.51.1