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Wed, 6 May 2026 09:08:25 -0500 From: Siddharth Vadapalli To: , , , , , , , , , , , , , , , , , , CC: , , , , , , Subject: [PATCH v2 01/13] arm64: dts: ti: k3-am642-hummingboard-t: fix USB clocking for compliance Date: Wed, 6 May 2026 19:39:33 +0530 Message-ID: <20260506141040.1368918-2-s-vadapalli@ti.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20260506141040.1368918-1-s-vadapalli@ti.com> References: <20260506141040.1368918-1-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: SA2PEPF00003AE9:EE_|PH3PPFBE2296547:EE_ X-MS-Office365-Filtering-Correlation-Id: 0aef3cd8-f864-4ae5-74b3-08deab78f71e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|376014|1800799024|7416014|82310400026|921020|18002099003|22082099003|56012099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: HeCthE1K3VvV4m7voowzGQsI+IJoIlD2tyJvdrWCPa0fc3RLE4BELDCQ5LBkbzwlJ8URYlzyIG/4MegG7BCYMp0r1zkQt4xMOeAlTHr/WIfED2MhkTG6OLVoIY06oeD8f+9wTejlbH99PD+2fp4QxZFbKQk/4S1icCrQq9CXN16VbI2/SH7VPnozscD1uZhZcKjoE6Vjy+9hPoobAX9gJy0/e4HOC+e8caIJO3mt9mJ5ESDkWHWEbx888vVSPWO0flpI17PWuUwWDYeZxPfqtc+qDhsqFopC3IZ0twhcas42ChYjKzyO+z8jwLy4nAXswQvU478D3hK9lLyiJId/lGQwDoulIsVuzh7cuoxmwnnKsx8ESId/vzSMxMdSkZoYGWbL9hphs99vDFwjVec7TPZo1AZZU4WjxyeBxgj8iW2vDJQzuR8THcO2HMr3QgRt X-OriginatorOrg: ti.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 May 2026 14:08:36.2839 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0aef3cd8-f864-4ae5-74b3-08deab78f71e 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: SA2PEPF00003AE9.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH3PPFBE2296547 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 Acked-by: Josua Mayer --- v1: https://lore.kernel.org/r/20260505110631.1144200-2-s-vadapalli@ti.com/ Changes since v1: - Collected Acked-by tag. 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