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Tue, 5 May 2026 06:04:30 -0500 From: Siddharth Vadapalli To: , , , , , , , , , , , , , , , , , , CC: , , , , , , Subject: [PATCH 03/13] arm64: dts: ti: k3-am642-sk: fix USB clocking for compliance Date: Tue, 5 May 2026 16:36:04 +0530 Message-ID: <20260505110631.1144200-4-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: SJ1PEPF0000231B:EE_|IA4PR10MB8541:EE_ X-MS-Office365-Filtering-Correlation-Id: 40723dd6-e48d-4c73-7100-08deaa961999 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|82310400026|376014|7416014|1800799024|921020|22082099003|18002099003|56012099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 7GY3VsKiVkTr1KhvJ1TOc+1jHQI45CS+8k/WtHiAqV3sbyjMyKIT0eKu55hvVotRV7oH79YzZ9eom/blfOHujDiY68NOCiLjSzH57ZkEDNmsvlJkqwdQ8HSSLKsXnF9v9fWASu9FVwvTMiUv6DB+wSulKFe9m66vx51AXo7EefCEgZDfcpdH3jl0lLZj75g4/hR0G72wSxS2kMwuB4b/huo6HB+d4m5jCG5xudlpOSmxzWWQ5XZnOgoBe+fIIkNfYYzbV8YnX3VwXsVvoZDMWlOf2HX6UYVbxT57NviWiGDNePs7HZVfIA4mAU63PGa86ATWvw41hzBrctyQhwK/IIT0yEcr7suUfCoXr1Ba9RoFVJcbECIV+r7RF91zDVaYHg3A1uTyxm4Q7wG+YzlRu9GaNljcL22tlj7YdpFwORlRd82OMRgTLDjeDbfVC0O5 X-OriginatorOrg: ti.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 May 2026 11:04:38.3158 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 40723dd6-e48d-4c73-7100-08deaa961999 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: SJ1PEPF0000231B.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA4PR10MB8541 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: 4e8aa4e3559a ("arm64: dts: ti: k3-am642-sk: Enable USB Super-Speed HOST port") Cc: Signed-off-by: Luis Parga Signed-off-by: Siddharth Vadapalli --- arch/arm64/boot/dts/ti/k3-am642-sk.dts | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-am642-sk.dts b/arch/arm64/boot/dts/ti/k3-am642-sk.dts index d28a38c87f32..9f63fea5e6a4 100644 --- a/arch/arm64/boot/dts/ti/k3-am642-sk.dts +++ b/arch/arm64/boot/dts/ti/k3-am642-sk.dts @@ -463,6 +463,11 @@ &serdes_refclk { &serdes_wiz0 { bootph-all; + 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 { @@ -473,6 +478,7 @@ 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