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Tue, 5 May 2026 06:04:57 -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 645B49h52831834; Tue, 5 May 2026 06:04:50 -0500 From: Siddharth Vadapalli To: , , , , , , , , , , , , , , , , , , CC: , , , , , , Subject: [PATCH 06/13] arm64: dts: ti: k3-am68-sk-baseboard: fix USB clocking for compliance Date: Tue, 5 May 2026 16:36:07 +0530 Message-ID: <20260505110631.1144200-7-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: DS3PEPF000099DE:EE_|MN2PR10MB4383:EE_ X-MS-Office365-Filtering-Correlation-Id: 0eafe7d5-02b3-4af7-ff6d-08deaa962565 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700016|7416014|376014|1800799024|921020|18002099003|56012099003|22082099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: mvekPSUaXskI6vhDImF/y+2GKsvRAuLvtDx4h7pmLeaLa8WTljVLjnjvmKmq3IMS5qCcfZnARMH4p/o38wWmwV8r1ylY7CRtXfiQo2lRaCEBZGBBv4O+clQ8uFs4x7ugphlcubz6pflE9YoSOVvmTp2g/qf5PIpvuS8ImFZlwViMxI849TJoTGGjNgSS3PY7hv/z//hAZ8/Mz1aEO+MDqPWzsVEp7RrHb7vj6/zzXOgy5lQXt+EgvU+Ad6zpo3wfBqa7kwkMFKIyiDJZW+Re1oHiFmnn4Xmjkuw9VRfduRtgQCPaktwL9a/gWo3pEEyAjZ6McNI6wWAyznmEdUaE3HDFtGl4i6+DkiHatzQsKb+MuLi28oHyuMM8djUs1zd4y2SX62ShaR2euLcBM3JJBRYx/wX6jzLK4kLu6huTz8KD3RAXfgMJAlv+bflruJ40 X-OriginatorOrg: ti.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 May 2026 11:04:58.1399 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0eafe7d5-02b3-4af7-ff6d-08deaa962565 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: DS3PEPF000099DE.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR10MB4383 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: 067878e6cd25 ("arm64: dts: ti: k3-am68-sk: Add DT node for USB") Cc: Signed-off-by: Siddharth Vadapalli --- arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts b/arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts index 8178333fb2b4..d44c3685503c 100644 --- a/arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts +++ b/arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts @@ -793,6 +793,14 @@ &serdes_refclk { clock-frequency = <100000000>; }; +&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 */ +}; + &serdes0 { status = "okay"; @@ -810,6 +818,7 @@ serdes0_usb_link: phy@2 { cdns,num-lanes = <1>; #phy-cells = <0>; cdns,phy-type = ; + cdns,ssc-mode = <2>; /* 2 for internal SSC */ resets = <&serdes_wiz0 3>; }; }; -- 2.51.1