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Wed, 6 May 2026 09:09:46 -0500 Received: from toolbox.dhcp.ti.com (uda0492258.dhcp.ti.com [10.24.73.74]) by lelvem-mr06.itg.ti.com (8.18.1/8.18.1) with ESMTP id 646E8IWx1221395; Wed, 6 May 2026 09:09:39 -0500 From: Siddharth Vadapalli To: , , , , , , , , , , , , , , , , , , CC: , , , , , , Subject: [PATCH v2 12/13] arm64: dts: ti: k3-j722s-evm: fix USB clocking for compliance Date: Wed, 6 May 2026 19:39:44 +0530 Message-ID: <20260506141040.1368918-13-s-vadapalli@ti.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20260506141040.1368918-1-s-vadapalli@ti.com> References: <20260506141040.1368918-1-s-vadapalli@ti.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-C2ProcessedOrg: 333ef613-75bf-4e12-a4b1-8e3623f5dcea X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF00020E61:EE_|CO6PR10MB5634:EE_ X-MS-Office365-Filtering-Correlation-Id: 4b09fc91-7899-4a30-5d4a-08deab792241 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|376014|7416014|1800799024|82310400026|921020|56012099003|22082099003|18002099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: wLgA169g6K7aM2+saa9AwgwH+A1wJol0h/K5/UMIYv/1rYitemiu+1LtqMK6mb0RV+IJX5/ZsphqpiZyJfcU12IqGV16oe/hpUY1c5NmDtzAm3PM9FUcBix9gIf9JHmtpGhpzgdOZ193hI6Vl0yzTFlSrM1CRcZjyVM7QPGUDHcDAzfgilKUDK66N++SELgv1jBLRKWxGtUbY8tJuyM5T1IGnGlm8JSN7b1u2t75QNB8FJNTsQ/5wId1krZ4+yWDlMVfzRXoR8K4o7HJrp2ufmJflOKja8g5YJygQR2FHyddNH679lO98erXIxHpR1hQiazNaIoTdFR9YOXcDym0XQKFqQp6mH0tsWyL4pF/UnWMMMn8iThlLmsbAUAOdKmOjLn2OloW2JYrYwox1t5rN3SwC3tIackMPQRThQCMPbc3dYQ9DVdzCnzigJWenowx X-OriginatorOrg: ti.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 May 2026 14:09:48.6141 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4b09fc91-7899-4a30-5d4a-08deab792241 X-MS-Exchange-CrossTenant-Id: e5b49634-450b-4709-8abb-1e2b19b982b7 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=e5b49634-450b-4709-8abb-1e2b19b982b7;Ip=[198.47.23.195];Helo=[lewvzet201.ext.ti.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF00020E61.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO6PR10MB5634 From: Luis Parga According to section "6.5.3 Normative Spread Spectrum Clocking (SSC)" of the USB 3.2 Specification, SSC should be enabled by default. This protects against EMI violations. Hence, enable internal SSC for USB SuperSpeed. Fixes: 485705df5d5f ("arm64: dts: ti: k3-j722s: Enable PCIe and USB support on J722S-EVM") Cc: Signed-off-by: Luis Parga Signed-off-by: Siddharth Vadapalli --- v1: https://lore.kernel.org/r/20260505110631.1144200-13-s-vadapalli@ti.com/ Changes since v1: - Reordered properties in serdes_wiz0 node to place status at the end. arch/arm64/boot/dts/ti/k3-j722s-evm.dts | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts index e66330c71593..06b83e94da67 100644 --- a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts +++ b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts @@ -745,6 +745,11 @@ &serdes_ln_ctrl { }; &serdes_wiz0 { + ti,core-clk-sel = <1>; /* Select internal reference clock */ + ti,ssc-enable; /* Enable SSC */ + ti,ssc-type = <1>; /* 1 for Downspread */ + ti,ssc-frequency-hz = <33000>; /* 33 KHz */ + ti,ssc-depth-per-mil = <5>; /* 0.5% depth */ status = "okay"; }; @@ -754,6 +759,7 @@ serdes0_usb_link: phy@0 { cdns,num-lanes = <1>; #phy-cells = <0>; cdns,phy-type = ; + cdns,ssc-mode = <2>; /* 2 for internal SSC */ resets = <&serdes_wiz0 1>; }; }; -- 2.51.1