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Tue, 5 May 2026 06:05:11 -0500 From: Siddharth Vadapalli To: , , , , , , , , , , , , , , , , , , CC: , , , , , , Subject: [PATCH 09/13] arm64: dts: ti: k3-j721e-beagleboneai64: fix USB clocking for compliance Date: Tue, 5 May 2026 16:36:10 +0530 Message-ID: <20260505110631.1144200-10-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: DS2PEPF00003441:EE_|PH7PR10MB6625:EE_ X-MS-Office365-Filtering-Correlation-Id: 74286c15-6a4d-4101-16ef-08deaa9631a9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|1800799024|7416014|36860700016|376014|921020|22082099003|56012099003|18002099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: tVjAfJsCDOrcXsIQfwerL7bubogZUeydOLleM+4GrxKlGyvPAGnE5RJaAkuL3kjGNEk6kWefyax1aKWP1RCUuwwA28bYIFpAQpXuEq2EpqWrXzDB3sDsHlyx0znmNIGaB58XMSg5XT8Wz6Dx2We6PhTaFkYofS+/nqDoGB1aMjp/cVJa1R/gDM0bDzSpIB34b8ChHUvKPnBwxJsQwYuWvrJlBu0M53ck5zQx2205rdkZxRPsljLTJF64IYYQ3HtRfXjpZ8KOQMhZdaFL+WDy3DfXZFI7f/3egnBm2nP9VMjwuhHiamvXunrY2khxeeysmvATaFDynrf0da1xxHx3MtQFm2EsZUshMttpOxBGIop0eVsNQWH9BelEuq/vJLLqTyl0kG1UGFtGGAiJ/dk4Ci4tcszE7S3blkgPCJXgB2ush/X0ga1CyFLsuk/XUlBx X-OriginatorOrg: ti.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 May 2026 11:05:18.7125 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 74286c15-6a4d-4101-16ef-08deaa9631a9 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: DS2PEPF00003441.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR10MB6625 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: fae14a1cb8dd ("arm64: dts: ti: Add k3-j721e-beagleboneai64") Cc: Signed-off-by: Siddharth Vadapalli --- .../arm64/boot/dts/ti/k3-j721e-beagleboneai64.dts | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-j721e-beagleboneai64.dts b/arch/arm64/boot/dts/ti/k3-j721e-beagleboneai64.dts index 8040b6528c18..1e87c6cf146a 100644 --- a/arch/arm64/boot/dts/ti/k3-j721e-beagleboneai64.dts +++ b/arch/arm64/boot/dts/ti/k3-j721e-beagleboneai64.dts @@ -578,6 +578,11 @@ &serdes_ln_ctrl { &serdes_wiz3 { typec-dir-gpios = <&main_gpio1 3 GPIO_ACTIVE_LOW>; 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 { @@ -586,6 +591,7 @@ 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>; }; }; @@ -621,12 +627,21 @@ &usb0 { phy-names = "cdns3,usb3-phy"; }; +&serdes_wiz2 { + 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 */ +}; + &serdes2 { serdes2_usb_link: phy@1 { reg = <1>; cdns,num-lanes = <1>; #phy-cells = <0>; cdns,phy-type = ; + cdns,ssc-mode = <2>; /* 2 for internal SSC */ resets = <&serdes_wiz2 2>; }; }; -- 2.51.1