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Tue, 20 Jan 2026 07:03:16 -0600 Received: from [172.24.235.213] (gehariprasath.dhcp.ti.com [172.24.235.213]) by lelvem-mr06.itg.ti.com (8.18.1/8.18.1) with ESMTP id 60KD39mf1099956; Tue, 20 Jan 2026 07:03:09 -0600 Message-ID: <6650770b-2e9c-4f9a-8310-1f335ffa69f8@ti.com> Date: Tue, 20 Jan 2026 18:33:08 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [EXTERNAL] [PATCH] arm64: dts: ti: k3-am62d2-evm: Fix missing RX delay for DP83867 PHY To: Siddharth Vadapalli , , , , , , , , , CC: , , , , References: <20260120061335.1497832-1-s-vadapalli@ti.com> Content-Language: en-US From: Hari Prasath In-Reply-To: <20260120061335.1497832-1-s-vadapalli@ti.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-C2ProcessedOrg: 333ef613-75bf-4e12-a4b1-8e3623f5dcea X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS1PEPF00017095:EE_|IA1PR10MB7113:EE_ X-MS-Office365-Filtering-Correlation-Id: 51c62ece-cfc3-422a-1bc8-08de582447a3 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|36860700013|1800799024|82310400026|921020; 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X-OriginatorOrg: ti.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Jan 2026 13:03:17.6051 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 51c62ece-cfc3-422a-1bc8-08de582447a3 X-MS-Exchange-CrossTenant-Id: e5b49634-450b-4709-8abb-1e2b19b982b7 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=e5b49634-450b-4709-8abb-1e2b19b982b7;Ip=[198.47.21.194];Helo=[flwvzet200.ext.ti.com] X-MS-Exchange-CrossTenant-AuthSource: DS1PEPF00017095.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR10MB7113 On 20/01/26 11:43 am, Siddharth Vadapalli wrote: > 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 > ZjQcmQRYFpfptBannerStart > This message was sent from outside of Texas Instruments. > Do not click links or open attachments unless you recognize the source > of this email and know the content is safe. > Report Suspicious > uRdqXRfPtm07agZk_PPjvDYD9oe_mpoIkkjINUyRhGSu--0mQdy1pi4MPng- > ix3RK2L1V3y4DrnTdaCm8zj7QGx0QX2i$> > ZjQcmQRYFpfptBannerEnd > > MAC Ports 1 and 2 of the CPSW3G Ethernet Switch in the AM62D2 SoC are both > connected to different instances of the DP83867 Ethernet PHY on the AM62D2 > EVM, with the 'phy-mode' set to 'rgmii-id'. The DP83867 Ethernet PHY has to > add a 2 nanosecond delay on receive (from wire) based on the EVM design. > > Since the device driver for the DP83867 Ethernet PHY coincidentally assumes > that the a 2 nanosecond receive delay has to be added in the absence of the 'the' can be removed here.Verified this claim on default value in the driver without this DT property. Reviewed-by: Hari Prasath Gujulan Elango > 'ti,rx-internal-delay' property, Ethernet is functional. > > However, since the device-tree is intended to describe the Hardware, and, > the device driver for the DP83867 Ethernet PHY may change in the future, > add the 'ti,rx-internal-delay' property and assign it the value > 'DP83867_RGMIIDCTL_2_00_NS' which corresponds to a 2 nanosecond > delay. > > Fixes: 1544bca2f188 ("arm64: dts: ti: Add support for AM62D2-EVM") > Cc: > Signed-off-by: Siddharth Vadapalli > --- > > Hello, > > This patch is based on commit > 24d479d26b25 Linux 6.19-rc6 > of Mainline Linux. > > Patch has been tested on the AM62D2 EVM verifying Ethernet functionality in > the form of NFS (Network File System) mounted using the CPSW3G Ethernet > interface 'eth0'. Test Logs: > https://urldefense.com/v3/__https://gist.github.com/Siddharth-Vadapalli- > at-TI/04c51da22c0a05f7fc930afc98997571__;!!G3vK! > QTTK5TlfaumfenDPi727EMMDEuWq4go3k_u6HRWdaWchECwvYWQxiJzQtxgzKNMLr3FEjTj7x-zpSSw3CA$ > > 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 = ; > ti,fifo-depth = ; > ti,min-output-impedance; > }; > > cpsw3g_phy1: ethernet-phy@3 { > reg = <3>; > + ti,rx-internal-delay = ; > ti,fifo-depth = ; > ti,min-output-impedance; > }; > -- > 2.51.1 > >