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Tue, 5 May 2026 06:36:04 -0500 Message-ID: Date: Tue, 5 May 2026 17:08:26 +0530 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird CC: , , , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH 07/13] arm64: dts: ti: k3-am69-aquila: fix USB clocking for compliance To: Francesco Dolcini References: <20260505110631.1144200-1-s-vadapalli@ti.com> <20260505110631.1144200-8-s-vadapalli@ti.com> <20260505110825.GA69476@francesco-nb> Content-Language: en-US From: Siddharth Vadapalli In-Reply-To: <20260505110825.GA69476@francesco-nb> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-C2ProcessedOrg: 333ef613-75bf-4e12-a4b1-8e3623f5dcea X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN3PEPF0000B071:EE_|SA1PR10MB6566:EE_ X-MS-Office365-Filtering-Correlation-Id: f0d00c8e-f9e9-4243-1277-08deaa9a8248 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|82310400026|1800799024|376014|7416014|18002099003|22082099003|56012099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: w0yNh7RL2zzUD+zguI3SrscPpGpefHqnBV2ryt980etvcE43XkutmMFC1Ke7Ukz2zHmmZ0OX5l0d6yAnSK/cfjWiT9LrMAGy8/CBueLfEszq+IgGYUgIUaVphqtuv53E40pdw3cfF/71E0Fe4b0P3K3tfcXPwYLhaeI0ZoMQvInvCM0eaGvdR4qVjiM9/Gi6udFNEM7Hmhj9/eccth5sKPPCwUJXD5W/jfVZDu5ApT+3PXYEtD6822/Z+eFG4yf2OujIFEVsSiBP11OHup1eDLLvkJ5IZKWLSZMKkfh3FCsOGCxVckXpIftZFMYS+v6+u+ti+8Thk7MnL3cnrP1kCZyHqxlAbd1NM4hlQ9wtxNhcD0TQ5L+KaX8SvGwcYa/WNWs3efrMYAboChO6RfBRftlMDinBV1hSSJ9eNbDGBbwbGaKC1NKCS+sO4ywc7Rdf X-OriginatorOrg: ti.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 May 2026 11:36:11.9436 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f0d00c8e-f9e9-4243-1277-08deaa9a8248 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: BN3PEPF0000B071.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR10MB6566 On 05/05/26 16:38, Francesco Dolcini wrote: > Hi Siddharth, > > On Tue, May 05, 2026 at 04:36:08PM +0530, Siddharth Vadapalli wrote: >> 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: 39ac6623b1d8 ("arm64: dts: ti: Add Aquila AM69 Support") >> Cc: >> Signed-off-by: Siddharth Vadapalli >> --- >> arch/arm64/boot/dts/ti/k3-am69-aquila.dtsi | 6 ++++++ >> 1 file changed, 6 insertions(+) >> >> diff --git a/arch/arm64/boot/dts/ti/k3-am69-aquila.dtsi b/arch/arm64/boot/dts/ti/k3-am69-aquila.dtsi >> index 5119baf62a4c..7c98ee81ccb5 100644 >> --- a/arch/arm64/boot/dts/ti/k3-am69-aquila.dtsi >> +++ b/arch/arm64/boot/dts/ti/k3-am69-aquila.dtsi >> @@ -1423,6 +1423,7 @@ serdes0_usb0_ss_link: phy@3 { >> resets = <&serdes_wiz0 4>; >> cdns,num-lanes = <1>; >> cdns,phy-type = ; >> + cdns,ssc-mode = <2>; /* 2 for internal SSC */ >> }; >> }; >> >> @@ -1502,6 +1503,11 @@ &serdes_ln_ctrl { >> >> &serdes_wiz0 { >> status = "okay"; >> + 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 */ > > These properties must go before status. Please see the coding guideline. Thank you for pointing it out. I will fix this in all relevant patches of this series and post the v2 series in a day (to allow others to review as well). As indicated in the cover letter, I was able to test this series on all TI Boards (EVMs / SKs). It will help if you could test this series on Toradex boards. Regards, Siddharth.