linux-kernel - [PATCH v2] arm64: dts: ti: k3-am62d2-evm: Fix missing RX delay for DP83867 PHY

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Message-ID: <20260121054552.1650926-1-s-vadapalli@ti.com>
Date: Wed, 21 Jan 2026 11:15:50 +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>, <gehariprasath@...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 v2] 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 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>
Reviewed-by: Hari Prasath Gujulan Elango <gehariprasath@...com>
---

Hello,

v1 of this patch is at:
https://lore.kernel.org/r/20260120061335.1497832-1-s-vadapalli@ti.com/
Changes since v1:
- Fixed typo in the commit message based on the feedback at:
  https://lore.kernel.org/r/6650770b-2e9c-4f9a-8310-1f335ffa69f8@ti.com/
- Collected Reviewed-by tag from
  Hari Prasath Gujulan Elango <gehariprasath@...com>
  https://lore.kernel.org/r/6650770b-2e9c-4f9a-8310-1f335ffa69f8@ti.com/

Patch is based on commit
6c790212c588 Merge tag 'devicetree-fixes-for-6.19-3' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux
of Mainline Linux.

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