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Tue, 5 May 2026 06:04:37 -0500 From: Siddharth Vadapalli To: , , , , , , , , , , , , , , , , , , CC: , , , , , , Subject: [PATCH 04/13] arm64: dts: ti: k3-am642-tqma64xxl: fix USB clocking for compliance Date: Tue, 5 May 2026 16:36:05 +0530 Message-ID: <20260505110631.1144200-5-s-vadapalli@ti.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20260505110631.1144200-1-s-vadapalli@ti.com> References: <20260505110631.1144200-1-s-vadapalli@ti.com> 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: SJ1PEPF0000231B:EE_|SAWPR10MB997879:EE_ X-MS-Office365-Filtering-Correlation-Id: bf6957fe-d5ed-4393-b8e2-08deaa961d53 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|82310400026|36860700016|1800799024|56012099003|22082099003|18002099003|921020; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:198.47.21.194;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:flwvzet200.ext.ti.com;PTR:ErrorRetry;CAT:NONE;SFS:(13230040)(376014)(7416014)(82310400026)(36860700016)(1800799024)(56012099003)(22082099003)(18002099003)(921020);DIR:OUT;SFP:1101; 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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: 4717a36f31ec ("arm64: dts: ti: Add TQ-Systems TQMa64XxL SoM and MBaX4XxL carrier board Device Trees") Cc: Signed-off-by: Siddharth Vadapalli --- arch/arm64/boot/dts/ti/k3-am642-tqma64xxl-mbax4xxl.dts | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-am642-tqma64xxl-mbax4xxl.dts b/arch/arm64/boot/dts/ti/k3-am642-tqma64xxl-mbax4xxl.dts index 46be6824dd16..e5d1b2ebf2c8 100644 --- a/arch/arm64/boot/dts/ti/k3-am642-tqma64xxl-mbax4xxl.dts +++ b/arch/arm64/boot/dts/ti/k3-am642-tqma64xxl-mbax4xxl.dts @@ -504,6 +504,14 @@ &serdes_refclk { bootph-all; }; +&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 { serdes0_usb_link: phy@0 { reg = <0>; @@ -512,6 +520,7 @@ serdes0_usb_link: phy@0 { bootph-all; cdns,num-lanes = <1>; cdns,phy-type = ; + cdns,ssc-mode = <2>; /* 2 for internal SSC */ }; }; -- 2.51.1