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Tue, 5 May 2026 06:05:18 -0500 From: Siddharth Vadapalli To: , , , , , , , , , , , , , , , , , , CC: , , , , , , Subject: [PATCH 10/13] arm64: dts: ti: k3-j721e-common-proc-board: fix USB clocking for compliance Date: Tue, 5 May 2026 16:36:11 +0530 Message-ID: <20260505110631.1144200-11-s-vadapalli@ti.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20260505110631.1144200-1-s-vadapalli@ti.com> References: <20260505110631.1144200-1-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: DS2PEPF00003443:EE_|BL3PR10MB6019:EE_ X-MS-Office365-Filtering-Correlation-Id: 1f2e0b81-4837-42a8-5917-08deaa9635aa X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|1800799024|36860700016|376014|82310400026|921020|22082099003|56012099003|18002099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: edktPvRbHd05rRZnSwtkf8eOzPNg+hnQCH65qkyJ4UnD2VUxDXFh1ZQZaSGQ2oSrW4jnJ/wBzrVLXyzur+MqL9mqxqt2EgWpNIpjyuYPP79z9vzcCWs5/PeJohBqYWjV0uKRiD3ij4n1A9toV6OUOgSzbpBpJ6BOZCDvo4Du7BKHUnzgD/1Eec4AdkdtCBGDB4hKTNCtz4p8elttcDmXpiK96hwiy3zjSqA47K4+EBLxAY2vqdB2LV7t7Kw/imVM62+FFxZRW66/yfhT7BYGwwJWQ8vSawbGSLdjVyZ7QGNEAyyc29oWYd/FzTrb7M0XGHR0XgHRYbwhK8Whe+Q/4BIIQLEGnvrutjd0kqsmPFEKfzO/bfN6pCOe6wk2wu4HiNiVTxjo1R9VIKb2iPVZ2NhwJ1+OLzIbltG9oVxAdMBNHg0Q25HGU20MlFfXMVjg X-OriginatorOrg: ti.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 May 2026 11:05:25.4373 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1f2e0b81-4837-42a8-5917-08deaa9635aa X-MS-Exchange-CrossTenant-Id: e5b49634-450b-4709-8abb-1e2b19b982b7 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=e5b49634-450b-4709-8abb-1e2b19b982b7;Ip=[198.47.21.195];Helo=[flwvzet201.ext.ti.com] X-MS-Exchange-CrossTenant-AuthSource: DS2PEPF00003443.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL3PR10MB6019 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: 02c35dca2b48 ("arm64: dts: ti: k3-j721e: Enable Super-Speed support for USB0") Cc: Signed-off-by: Siddharth Vadapalli --- arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts b/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts index 53e7fbcef52b..b25bce995b64 100644 --- a/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts +++ b/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts @@ -531,6 +531,11 @@ &serdes_ln_ctrl { &serdes_wiz3 { typec-dir-gpios = <&main_gpio1 3 GPIO_ACTIVE_HIGH>; typec-dir-debounce-ms = <700>; /* TUSB321, tCCB_DEFAULT 133 ms */ + 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 */ }; &serdes3 { @@ -539,6 +544,7 @@ serdes3_usb_link: phy@0 { cdns,num-lanes = <2>; #phy-cells = <0>; cdns,phy-type = ; + cdns,ssc-mode = <2>; /* 2 for internal SSC */ resets = <&serdes_wiz3 1>, <&serdes_wiz3 2>; bootph-all; }; -- 2.51.1