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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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260505_040502_403400_D70EF48B X-CRM114-Status: GOOD ( 10.05 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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