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Wed, 6 May 2026 09:09:33 -0500 From: Siddharth Vadapalli To: , , , , , , , , , , , , , , , , , , CC: , , , , , , Subject: [PATCH v2 11/13] arm64: dts: ti: k3-j721e-sk: fix USB clocking for compliance Date: Wed, 6 May 2026 19:39:43 +0530 Message-ID: <20260506141040.1368918-12-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: CH2PEPF0000009F:EE_|CH3PR10MB7120:EE_ X-MS-Office365-Filtering-Correlation-Id: 47ede316-3c6c-4ec4-689f-08deab79233a 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: m1tKJZ00XVNB/KkcEMGv7TCCcgUoKo0yKCm8Slf1UPUH5Sbff5zUk8Zi4BPJ1Byxm+Dzm9svaZb0I5WJewqUcnh+mANW8aYd/mvEAWOsjkUvLjax7LmLXye1JXN3dEIlbVlZJ59WmVnXNtJp6qTO8Uz2zqa6Jh66FmpwKhIYP5+kC69r3bNkcF1clWTJkVJBq+tuZnuLmfNBwZNAXmYpafrUlN7UdsC5amOLJXBANY8YGgE9VtyizBtl4Y6ejGYaSHPsI9FInCm+mG96OXuzzlzFyTLaFVRS0VXPjW6dEvFZgdItnrwmFQ96W40WCvGvnNQEFSOOx01zjKqQA7sFO//pvUlSYXkszfBptT6Ik6ON/Bl1ohf9+wRUJJDaa4Lwj904krmZh/KzIp/i3Z7qgvdIbYyN5bk0bdr5VVptcjTy1nOaevpy7UVJ51AJEHC6 X-OriginatorOrg: ti.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 May 2026 14:09:50.2556 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 47ede316-3c6c-4ec4-689f-08deab79233a 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: CH2PEPF0000009F.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR10MB7120 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: 1bfda92a3a36 ("arm64: dts: ti: Add support for J721E SK") Cc: Signed-off-by: Siddharth Vadapalli --- v1: https://lore.kernel.org/r/20260505110631.1144200-12-s-vadapalli@ti.com/ No changes since v1. arch/arm64/boot/dts/ti/k3-j721e-sk.dts | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-j721e-sk.dts b/arch/arm64/boot/dts/ti/k3-j721e-sk.dts index 689ba2ff81f7..79927a34edff 100644 --- a/arch/arm64/boot/dts/ti/k3-j721e-sk.dts +++ b/arch/arm64/boot/dts/ti/k3-j721e-sk.dts @@ -960,6 +960,11 @@ &serdes_ln_ctrl { &serdes_wiz3 { typec-dir-gpios = <&main_gpio1 3 GPIO_ACTIVE_HIGH>; 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 { @@ -968,6 +973,7 @@ 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>; bootph-all; }; @@ -1006,12 +1012,21 @@ &usb0 { bootph-all; }; +&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