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Wed, 6 May 2026 09:08:52 -0500 From: Siddharth Vadapalli To: , , , , , , , , , , , , , , , , , , CC: , , , , , , Subject: [PATCH v2 05/13] arm64: dts: ti: k3-am68-phyboard-izar: fix USB clocking for compliance Date: Wed, 6 May 2026 19:39:37 +0530 Message-ID: <20260506141040.1368918-6-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: SA2PEPF00003AE7:EE_|SAVPR10MB997819:EE_ X-MS-Office365-Filtering-Correlation-Id: 7282c6b3-62c7-4208-85a1-08deab790960 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|376014|7416014|1800799024|82310400026|921020|18002099003|56012099003|22082099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: l46aUBr9WgBETz+tArkn0uZY+EDMJr3F5FY+XWzUSGBsMo2wZRrPddEOiN2bJJW18Wf+OvD9Z4I235K8ah9Tsw9+F6UcUz21lgFxGx7yxYl63/SjAwRK1OZm2q1b09BndxKdS4hvz/LSXnJsrWh5UC9V05Aa3Khmy0wqblvVc53YcIqJ5oeqbIXWlG4Q21Ocrmz2/1UNCsR1qdxzWlMrOKUqd566q8bGJYtxk73wvXbgDWeYn3yp+fGLY5InzoQZeZ4N1EemappHAQy+Gemehcr8AZhLnAkEGG4+xWwyEM8wSoTxESeiDJGqRCTi9b87JNcOmvD5dwgsrfpZXZ4Qc3HzXhLo78//t/+WloPNVEmxE4o/2Jq9GhDx2u9nkfZLltmlhUxB6Sc7H9WlahhAjMShchTvzC4A9RprqJpQ6V8LxRjyAprOoB/xbzNti/Tt X-OriginatorOrg: ti.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 May 2026 14:09:06.9220 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7282c6b3-62c7-4208-85a1-08deab790960 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: SA2PEPF00003AE7.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SAVPR10MB997819 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: 8bc3b1c86452 ("arm64: dts: ti: Add basic support for phyBOARD-Izar-AM68x") Cc: Signed-off-by: Siddharth Vadapalli --- v1: https://lore.kernel.org/r/20260505110631.1144200-6-s-vadapalli@ti.com/ No changes since v1. arch/arm64/boot/dts/ti/k3-am68-phyboard-izar.dts | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-am68-phyboard-izar.dts b/arch/arm64/boot/dts/ti/k3-am68-phyboard-izar.dts index 225fe7a7803b..d9b61e426ff8 100644 --- a/arch/arm64/boot/dts/ti/k3-am68-phyboard-izar.dts +++ b/arch/arm64/boot/dts/ti/k3-am68-phyboard-izar.dts @@ -505,6 +505,14 @@ &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"; @@ -522,6 +530,7 @@ serdes0_usb_link: phy@1 { #phy-cells = <0>; resets = <&serdes_wiz0 2>; cdns,phy-type = ; + cdns,ssc-mode = <2>; /* 2 for internal SSC */ }; }; -- 2.51.1