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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: ikPP8WpYZcEh9l3sD886+/pc68pCJQqov7NR+9MO4z1izPDFjiHVdnuUANSapBGTNicSZDvDzHDaOWn6YRzMGKWDuf7ZagDe8yNVNN2JYOc53khG919pvLSlj9Eg1V30Gv60mfkJVRO8nxFnMd2ZiSFr6QkWmXf+jm7v3X1hUlnd5MaTDzKCOVb03oshU+kihRUnl3xdnw1WCnaJeLWMbJMSVCIBD+dKg1ZW2OPeWdSyvsgP4O3aXVUtZfZcfp46TjC6vFCfGNQp6MrFQ+AXwiHG7fNPFtTw78YrEZkLdoU7/n7IqdiFoxKX9QRJ7kCqEkapUxPJmsX53UXieOs+o5oHX+1d0hk5CEdL/dKF/JGDTiYHrrqoSQ8tY9o0OzicPn/o8mfyP2s7x27a5TvPWl3cjxnGJ0BjoKX0ARgYU0kbLgcVOyD83ZEToWSldPGf X-OriginatorOrg: ti.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 May 2026 11:04:23.8599 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d27550ef-5ae1-43f3-c261-08deaa9610f7 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: DS3PEPF000099DD.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN0PR10MB5934 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: e2b691804319 ("arm64: dts: ti: k3-am642-hummingboard-t: Convert overlay to board dts") Fixes: bbef42084cc1 ("arm64: dts: ti: hummingboard-t: add overlays for m.2 pci-e and usb-3") Cc: Signed-off-by: Siddharth Vadapalli --- arch/arm64/boot/dts/ti/k3-am642-hummingboard-t-usb3.dts | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-am642-hummingboard-t-usb3.dts b/arch/arm64/boot/dts/ti/k3-am642-hummingboard-t-usb3.dts index ee9bd618f370..90a158531f60 100644 --- a/arch/arm64/boot/dts/ti/k3-am642-hummingboard-t-usb3.dts +++ b/arch/arm64/boot/dts/ti/k3-am642-hummingboard-t-usb3.dts @@ -15,6 +15,14 @@ / { model = "SolidRun AM642 HummingBoard-T with USB-3.1 Gen 1"; }; +&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 { #address-cells = <1>; #size-cells = <0>; @@ -23,6 +31,7 @@ serdes0_link: phy@0 { reg = <0>; cdns,num-lanes = <1>; cdns,phy-type = ; + cdns,ssc-mode = <2>; /* 2 for internal SSC */ #phy-cells = <0>; resets = <&serdes_wiz0 1>; }; -- 2.51.1