From nobody Mon Feb 9 12:42:55 2026 Received: from EUR05-VI1-obe.outbound.protection.outlook.com (mail-vi1eur05on2055.outbound.protection.outlook.com [40.107.21.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9D66F35962; Fri, 24 Jan 2025 13:19:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.21.55 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737724752; cv=fail; b=FtdWcPOWpoUXD0XrEt4jVDA4/25V90bBVZ8UowGlMHeNPE3S8AEjS8sVFS1/JdV2WHXr5tz3IlWO7u9WBR/6cRBHczU1awAprbI0vPn9ET3zaS/oqd5Ly44ko8oTILaZAcVMfY3UVvrD3045IXrbokY/CMsKhs2/ECPd2GfqiCQ= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737724752; c=relaxed/simple; bh=c7vS15j68xK5P/4f4pfL73jV1V+RPuiJsZGgSbDHu38=; h=From:Date:Subject:Content-Type:Message-Id:References:In-Reply-To: To:Cc:MIME-Version; b=Tw9UUPL6Z5aia+J/+FzbD57gwVuTQxYK8YOGgfATyzpbbi9scpHoc5zvoWy4yAayD/Y/u7yFyvYFEC2VGR2ADLZojSRGNJh4c1JVazpDXBLbnzdT+f/NgvWoByJILGWnc7d5/sK3h87sx58KVGCulxghsKi2q+HowVfcRthphMU= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=oss.nxp.com; spf=pass smtp.mailfrom=oss.nxp.com; dkim=pass (2048-bit key) header.d=NXP1.onmicrosoft.com header.i=@NXP1.onmicrosoft.com header.b=Y5SIqJ8J; arc=fail smtp.client-ip=40.107.21.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=oss.nxp.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oss.nxp.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=NXP1.onmicrosoft.com header.i=@NXP1.onmicrosoft.com header.b="Y5SIqJ8J" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=aIs3oS/0sm/YHgmqfyS/i7Tq9WronnHimngWbbbe3371nfMWWy12L5OuE4cfpNfafJlqFOxILc2+xb8+qLlX/Qat/u7NoztzTV7bme6b1LzbKn4UzngcAFdV/2lcMmNrhSIAxdjgHVHWZVFQPen7irn6SMtpRJG0VPTt4dNdlf/E+Q+85dgu1wu8Up9UxaO0y6VaaiZuCHJWAZqafLPrx4rfMvp/EBfny/dQhVOacjVixo+VLWg3PoDlBhJFRS7fEGJHX2oxoFEHw9PpcmFQFkhwd5ij64KT+FVTBjob8LNOZIFKxQ480OXOK4tqcVO0ikiY+bcGOj3BHOMJ1nKZEQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=ye8sSfk9ofc/Dbnv+JnFLi9NmOa59ddc2EFp+ux2Uc0=; b=f6ueN7t6xEvV6MUbm2iTTmZoISy6B9+eFYGAKGV2BNjyE5wIEAdXPWf5gbrIgHqWkoZMJpPudP1XgfBq8+sVf36WdeoO6hWIMwWQvEpPROAKvoBqMxbPkMMNLUbC0p6OEByyww2Q/j9YUmwCkNR8GlIC1ht0sajYIfVsnXiT0s1Z6nakR5BNXsxGJXLWrRelmidaIFQT+znreaAQETS3ZgbwPuuXLhAQv2YS9Vw5W414/E2MromHLbSt8/FKAnOQd68sfyZhGC8Q9P1b+6LiaDA1jkTOwt/BqGr0C03uikKFLWW02G+sV5y+ZgSIWNagPK3elGHH1Sw/3KpB+4j4Mw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oss.nxp.com; dmarc=pass action=none header.from=oss.nxp.com; dkim=pass header.d=oss.nxp.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=NXP1.onmicrosoft.com; s=selector1-NXP1-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=ye8sSfk9ofc/Dbnv+JnFLi9NmOa59ddc2EFp+ux2Uc0=; b=Y5SIqJ8JvzhVzWDFhwrGahLwQlPNVoMfRcWoBh+n4XjyKY194zGZwko/2D9mG8mSRwECbr0Q/9p1+0YXXFkD9taMEJZtEa4dM0kPgZJF7euKWRJK7jWjxokdQI1WyPs430WoLBi2pbnQwOzpGZYCobD3JvqUWO2xqQZFe2GreFX0+qKuUOxZEdyUWTZqaiUCMiRkOcr9ok0btg5M6GMI0ZKe4r8PpZ6IDSrZkqzG4nXsvJJDWNTBjL4B5P/bkGDiKsST/xMfG3OPFbaKSMqI3apC+U4ETv7rYlKEZiptHj7bpkSeqnV7UW7o21WsQ3uS9HAC7N0GlOpgLtYsjs4F9Q== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=oss.nxp.com; Received: from PAXPR04MB8459.eurprd04.prod.outlook.com (2603:10a6:102:1da::15) by PAWPR04MB10007.eurprd04.prod.outlook.com (2603:10a6:102:387::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8377.18; Fri, 24 Jan 2025 13:19:08 +0000 Received: from PAXPR04MB8459.eurprd04.prod.outlook.com ([fe80::165a:30a2:5835:9630]) by PAXPR04MB8459.eurprd04.prod.outlook.com ([fe80::165a:30a2:5835:9630%5]) with mapi id 15.20.8377.009; Fri, 24 Jan 2025 13:19:07 +0000 From: "Peng Fan (OSS)" Date: Fri, 24 Jan 2025 22:25:17 +0800 Subject: [PATCH 1/3] clk: Introduce clk_set_spread_spectrum Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250124-clk-ssc-v1-1-2d39f6baf2af@nxp.com> References: <20250124-clk-ssc-v1-0-2d39f6baf2af@nxp.com> In-Reply-To: <20250124-clk-ssc-v1-0-2d39f6baf2af@nxp.com> To: Michael Turquette , Stephen Boyd , Russell King , Sudeep Holla , Cristian Marussi Cc: linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, arm-scmi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Rob Herring , Krzysztof Kozlowski , Dario Binacchi , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , imx@lists.linux.dev, Peng Fan X-Mailer: b4 0.14.2 X-ClientProxiedBy: SG2PR02CA0127.apcprd02.prod.outlook.com (2603:1096:4:188::7) To PAXPR04MB8459.eurprd04.prod.outlook.com (2603:10a6:102:1da::15) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PAXPR04MB8459:EE_|PAWPR04MB10007:EE_ X-MS-Office365-Filtering-Correlation-Id: 3523efe9-91db-4dff-b357-08dd3c79aed0 X-MS-Exchange-SharedMailbox-RoutingAgent-Processed: True X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|366016|52116014|1800799024|38350700014; X-Microsoft-Antispam-Message-Info: =?utf-8?B?bE0yU1dWMnhzSGl4SElqMVBaWk90Y2RYZmJTTEN2b1YvQjNYdnpqZTJybWZy?= =?utf-8?B?bUo5WlY4OUJWL3NocjM5bU5vQWpwMncxSy9aN2RPcEZVenhnMzhVQjY1cFly?= =?utf-8?B?QjIzMnVXZHdtdElvbjQ1VHM3K1RPNzQ1aVBZbDI0Y2d4Q0lpb1ljM3I4cDZn?= =?utf-8?B?VnBIR2YzYXY5SEFOUnJ2MlI4dGdMNEVzRnI5NWVveFd6OXZidmo3Wm4wK2Nz?= =?utf-8?B?aGJMNnJHZ3JnTnNMb2VaT0hJVGJHUmpDckZrRXZJQzloeWJ2ZU96djhNVkN1?= =?utf-8?B?dW0zemhCcnQ1V0liRktTMDdDK0ZFRyt3YVZBTTF4cHBUOEd0bEhrVVVVRG1M?= =?utf-8?B?a3ZKL0R6ZDJhcEpKZ2lWcUJTZmY5dmgzcVQ1WlhKV2lXNW1FbVZYYnZhSStC?= =?utf-8?B?UmY4ZklKaVVWMDRrMXN3dkdvRjZXN0VJVFRZdTVvaEMxR2t5UzYwcG1xT0py?= =?utf-8?B?akl2c3QwcEI4MkhpVDBzbEQxZ2FvbnkySXpxK0dYM1orazhHcFNZNHR2MFJM?= =?utf-8?B?NWNBV0p0L0JJQ2NXMDV1L2JTV1RSQ0Jwa0V4Rnovb1RNVXVldWNYdUE5Ri9Z?= =?utf-8?B?NFI5QVN0MFBHWVNWaEdEekgrTUErblpQcC9BSittdk9IS0xUMi9iRW9LZVli?= =?utf-8?B?aTJIWjc4bDJpTFI3OWNPclBodjVudUtUUTVJS2dma3haLzA5NUVTOW1HZDM5?= =?utf-8?B?SnNTY2s1R3pjc0tZdnVRL2JuWlZXczZlOTFKZ3pTK1dqcFlhU0RVbkFYaDVh?= =?utf-8?B?TWJEZXV2RnRoZHRTWTh6d0hua1BlOW9OcjdHTDdSeEorSW9qSWw4cU5pT0FO?= =?utf-8?B?RStxTGRIc3BtajJTY3NaQmNpQTZuQ2ViMXZMdVhGUHdrZElmblhGajZzQ1JY?= =?utf-8?B?WDJpcXBISnQ3U212ZDhmb2srbEYzSmwzbUhsRTQ0Sk9jaDNHZUQ4OERQOWIr?= =?utf-8?B?ZXV1S3FjVjgvekQvaktxTlZsUElCN1B0LzFIbUtjWHZLendVOSt0WWlKc3Az?= =?utf-8?B?Zk8rUStPME5FK0FFOU1aZXlSRUV0WDROZ0xEWk5zbEdadWdUeEFDQ1FvaXRX?= =?utf-8?B?WlRMSnY0RDVPRGFxZGtFSDhnV1F5QUJRbDZMcXFINkdlRm9aZDRjZjgvS3ll?= =?utf-8?B?Z2ZjdUFMK1BuNUtJcGNkMk9mQ1dTWWk4S0R4RURzblFLZ3E1UjdLS3VpMVZt?= =?utf-8?B?amRZRkF3S2Nra1pPdnREOWhvZnR6RTVjWSt3WmtlL1BXODlIeXhPVFhwZDF3?= =?utf-8?B?MVFDdUhxQTRyKzZCMEg4N0wyN1ZqaHlEMkZkeWZxM0NsdzFmZm9OY0JKYUc2?= =?utf-8?B?TldsSzBMek5kbFBrVE9INUREdmJoWjFYTVgvdUZ3VDdQbjRTbUdJbVpaajVU?= =?utf-8?B?eHc4SUMyaS9VVkRoU2xscjYzcHhvUEc4d0JhS0FKOC9uTElaTE05Q2pJc3pS?= =?utf-8?B?aW1JNXkwR3Z1cjdwUDExeitBd3pDSkdrUWVYR3l2dFQydG5iTHBTNG5iNkRq?= =?utf-8?B?UGM4N3loY3Y5VTVGamhtY1RyOXp0dTJWU2p6L1JwckNTdTNFdmsyNXl4aTFl?= =?utf-8?B?ejE3LzNSS09LQ2Y2Tm5GUFBNR2YwbkNUbVpEUWJyOVl2ZGJNdXM1aXEyOVNs?= =?utf-8?B?a1kweDk1dEFocGIvMW03T3A5UWN0WVFFdzZmM00vMlQ4RmI1QTZSQmpzcHNC?= =?utf-8?B?Um5qTjg2Qkc5RjVJTDZ1bnlOd3NCTnhKNTVUSDgzclBndzhGM2k2TFYzL242?= =?utf-8?B?enhtVHR1NEJ5SndBWFM2QVZkamxWWTdOY1B5UEluR1RDemd4cFdZbGwyME1k?= =?utf-8?B?MDhRQWx1RG50WkswWjJpbnZGdktUOGJPWUgwbVByeklLaFlrYWUxaExnK0V4?= =?utf-8?B?VUFoc01XbFo4OVRJdGl3NFl1Y25HQTgvS05MdG1oY0EwcU9ZTGlERjBsVnRQ?= =?utf-8?Q?euuEz41VACaBCMGHfb3Lxn1Xnbf3Lkp2?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:PAXPR04MB8459.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(376014)(7416014)(366016)(52116014)(1800799024)(38350700014);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?UVdFTXhzUERCTUZoOURTaFdadUdpUGR3OWFDdEFYT3p4YkVrN3RnVkpzbm9m?= =?utf-8?B?bFFMWFpjanNLTVVHNjNKTHpwVVpySFdjdVh4Q2k4N0YvR3htbWlLWXQ5czE0?= =?utf-8?B?SDE1Q04ySkx1OFdUUHRhdVQ5OHo2RWt1dVVTSFkyMjJrUjUzZHBTV2hZOTdv?= =?utf-8?B?U0I2UzlRcW1tVzhLcWJaRHVtTGpUWW1CM1hyQmNhT1g5OXdhODlnbXVQdGp0?= =?utf-8?B?T0F0cHE1T2d6OFlVQk9IdWZud1NUQVRxUmIwZCtHUFFzQ211Mmwwcjg0d3lZ?= =?utf-8?B?dFEybk5LOVR3bVpLWG5pL1pXMjZldmtadFJpSkdFRFM3Z1NjWjBuc0hsRW5j?= =?utf-8?B?Y0tVMXBpa2ZGNDBTYjE4Sm5HSnhJcEt5ZHREcWNZUGFycGFNWjlvaFNSQnFR?= =?utf-8?B?dGJtMFZJSnpkZERHYThqdGJUWmkxTkxCdlRnaFVicXRpWEtBUngrZXg1WFI3?= =?utf-8?B?QVgrdmFVbGltR1ZjbWxuOHhwdjJ4VmJkQjU2NSthZ2o2Rlo3VmJmeGx1TFkv?= =?utf-8?B?MWw0aWU4dkVPOVJMcUl6VzgwMWxSLzg0czNHRUNGVFhQeUtKTDMvcWxZZHY1?= =?utf-8?B?eXZCQmdjZHd6d1h6b1JxRklZd0lwWEJqVE5ZeXRNb0xkaUltWW9rVjltajcr?= =?utf-8?B?TmlSNFdkcnZWRVozUmtDV2FjN0toTXVOVjFaQmcza01BR2pTMkt0bk9kbmlX?= =?utf-8?B?TWFxTU5EbTh1QWI4VWZ5TVZUTzFtMmJtRjBaZEM4YWlmSWhNTlphUGI2cXQ2?= =?utf-8?B?MSsrL2VxT0JQMExiZkZET3I1S0dDNlhlYUh2SHorZjBicC9zdlNBdkVlNkhN?= =?utf-8?B?Lzk0Nk01UVlXNmhmZWxOUEkzSy9rZWFSZTBuMHBuSng2TFlwRmZBZE9uL2ll?= =?utf-8?B?d3YrRWJQU0VlSjhXaEt0WGdGTktKNUJzWG9sdzhQK2dIT015S3FKZXZKNzE0?= =?utf-8?B?TW51NHRYd3QzcGVjdVZMQWM0c0VWWllXd2k4OExwWE1MSFVxZTR6bUVoMjBr?= =?utf-8?B?TEhaQzNPVkVKZHVaMUJkcmpQUEp0VURNRWsvcGwrNHFvSmptNk9xV090SG5r?= =?utf-8?B?TmhOTEhiRzRPVkx4TTIxd2wwSDU4eFlvTTd6NkFPTHdGczYveDBoNlgyY2hU?= =?utf-8?B?U3RQeGZ6UUVmQlV2dEJXTk9TRngvQ1owM1NaNFJLMHJSSXNKemEwMnJrU293?= =?utf-8?B?QW9Ebm93ZlQ5cXd5Y1ZQay9VZnl2MXdWK2VkblFYVFhzenF0ZjlDR2d4VmVr?= =?utf-8?B?QmxoVjFIV1lROFFFYjl0cjNib0FTTVd2VnZ3T2VrRzBKaGJMdWxkVVlrbElJ?= =?utf-8?B?blFMejBETVpFKzFSUmlBdGdtZ1RLUkRrdFdlcVBFZWdDczdSSjFnc2V3R3hM?= =?utf-8?B?WmJKdEs5ajlwb1VTbG4zVDR0TElzN1MyN0VVaUxhWHkxaTNUd2g0TEdqb1pL?= =?utf-8?B?amd2WDY1YjVZRGFhZVozUzlQV3pUWlNsZVZvVWZBVVBkNXJXL2Y2cTkramxt?= =?utf-8?B?TjAwcHA5RTNscWVrbS9iZDB4SjZ3QlNrQlVsNnZacGtIVTAyRnE2eDBtdDI0?= =?utf-8?B?dktldmNidHNHc0ZVR1RUVitxbnZaWGNqQkZsNlpGOEVNR2prc3JYS1BEeGc2?= =?utf-8?B?REl6aStTUS9YSWpEaDdXdHZQN0FTM3QwYkZENTE2Zld6SUNtSTNWaUNqcUE0?= =?utf-8?B?K0FQOEd4WkVLcXhKem40Q3NucGpyQjQ3bjdJakN4eGYwbGRDbVpaQkNNdGN2?= =?utf-8?B?Y0dsUXIvekY1U3l0d3lSWEJmcWhheEhmd0ZvRkkrRTNlaHdDMElaUEhPazkx?= =?utf-8?B?VFNieWJrWDJZdW5RVE1EZlhXWHhydWFrSWhTK2E3YnhIaGxxTTRPZGd3Q3kz?= =?utf-8?B?LytZWWJJeXdSK0RZN21SZFRKQ09zZUZZWXM4Si9kVm5SempYa0VyeE00ckt6?= =?utf-8?B?Sm1oaWdWb29zZ1krTjdnMmY0azFrWGlOaHZUQ0xiUzlpWktLMGFuR0VrNDJB?= =?utf-8?B?UHdlVC9hcUhlMmNxWWhaRE90SVRpTGZjNGdTa3B0ZHlXUmlxK2Ixbjl3Nisx?= =?utf-8?B?OVNENSt3RithemtZOUVnRU11cmJwbkJYY29xOW1tYlBpamZNeG82SXN0c1hZ?= =?utf-8?Q?VxkPZgn9hn+Mv9GGNlesZOmjl?= X-OriginatorOrg: oss.nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3523efe9-91db-4dff-b357-08dd3c79aed0 X-MS-Exchange-CrossTenant-AuthSource: PAXPR04MB8459.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Jan 2025 13:19:07.9292 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: wnjVm+OdhyY67Mdqs1R3UOB0aRZuGt4R8qBNjmXiZvi0iPKZyy22vFfMOyvl8pd/4hQz5x+0p4XBy5mMTk2BrA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PAWPR04MB10007 From: Peng Fan Add clk_set_spread_spectrum to configure a clock to enable spread spectrum feature. set_spread_spectrum ops is added for clk drivers to have their own hardware specific implementation. Signed-off-by: Peng Fan --- drivers/clk/clk.c | 39 +++++++++++++++++++++++++++++++++++++++ include/linux/clk-provider.h | 22 ++++++++++++++++++++++ include/linux/clk.h | 22 ++++++++++++++++++++++ 3 files changed, 83 insertions(+) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index cf7720b9172ff223d86227aad144e15375ddfd86..a4fe4a60f839244b736e3c2751e= eb38dc4577b1f 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -2790,6 +2790,45 @@ int clk_set_max_rate(struct clk *clk, unsigned long = rate) } EXPORT_SYMBOL_GPL(clk_set_max_rate); =20 +int clk_set_spread_spectrum(struct clk *clk, unsigned int modfreq, + unsigned int spreadpercent, unsigned int method, + bool enable) +{ + struct clk_spread_spectrum clk_ss; + struct clk_core *core; + int ret =3D 0; + + if (!clk || !clk->core) + return 0; + + clk_ss.modfreq =3D modfreq; + clk_ss.spreadpercent =3D spreadpercent; + clk_ss.method =3D method; + clk_ss.enable =3D enable; + + clk_prepare_lock(); + + core =3D clk->core; + + if (core->prepare_count) { + ret =3D -EBUSY; + goto fail; + } + + ret =3D clk_pm_runtime_get(core); + if (ret) + goto fail; + + if (core->ops->set_spread_spectrum) + ret =3D core->ops->set_spread_spectrum(core->hw, &clk_ss); + + clk_pm_runtime_put(core); + clk_prepare_unlock(); +fail: + return ret; +} +EXPORT_SYMBOL_GPL(clk_set_spread_spectrum); + /** * clk_get_parent - return the parent of a clk * @clk: the clk whose parent gets returned diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index 2e6e603b749342931c0d0693c3e72b62c000791b..478005f4d53ed0698ea17331730= c755e08ea7984 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -84,6 +84,21 @@ struct clk_duty { unsigned int den; }; =20 +/** + * struct clk_spread_spectrum - Structure encoding spread spectrum of a cl= ock + * + * @modfreq: Modulation frequency + * @spreadpercent: Modulation percent + * @method: Modulation method + * @enable: enable or disable modulation + */ +struct clk_spread_spectrum { + unsigned int modfreq; + unsigned int spreadpercent; + unsigned int method; + bool enable; +}; + /** * struct clk_ops - Callback operations for hardware clocks; these are to * be provided by the clock implementation, and will be called by drivers @@ -178,6 +193,11 @@ struct clk_duty { * separately via calls to .set_parent and .set_rate. * Returns 0 on success, -EERROR otherwise. * + * @set_spread_spectrum: Configure the modulation frequency, modulation pe= rcentage + * and method. This callback is optional for clocks that does not + * support spread spectrum feature or no need to enable this feature. + * Returns 0 on success, -EERROR otherwise. + * * @recalc_accuracy: Recalculate the accuracy of this clock. The clock acc= uracy * is expressed in ppb (parts per billion). The parent accuracy is * an input parameter. @@ -255,6 +275,8 @@ struct clk_ops { int (*set_rate_and_parent)(struct clk_hw *hw, unsigned long rate, unsigned long parent_rate, u8 index); + int (*set_spread_spectrum)(struct clk_hw *hw, + struct clk_spread_spectrum *clk_ss); unsigned long (*recalc_accuracy)(struct clk_hw *hw, unsigned long parent_accuracy); int (*get_phase)(struct clk_hw *hw); diff --git a/include/linux/clk.h b/include/linux/clk.h index b607482ca77e987b9344c38f25ebb5c8d35c1d39..49a7f7eb8b03233e11cd3b92768= 896c4e45c4e7c 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -858,6 +858,21 @@ int clk_set_rate(struct clk *clk, unsigned long rate); */ int clk_set_rate_exclusive(struct clk *clk, unsigned long rate); =20 +/** + * clk_set_spread_spectrum - set the spread spectrum for a clock + * @clk: clock source + * @modfreq: modulation freq + * @spreadpercent: modulation percentage + * @method: down spread, up spread, center spread or else + * @enable: enable or disable + * + * Configure the spread spectrum parameters for a clock. + * + * Returns success (0) or negative errno. + */ +int clk_set_spread_spectrum(struct clk *clk, unsigned int modfreq, + unsigned int spreadpercent, unsigned int method, + bool enable); /** * clk_has_parent - check if a clock is a possible parent for another * @clk: clock source @@ -1088,6 +1103,13 @@ static inline int clk_set_rate_exclusive(struct clk = *clk, unsigned long rate) return 0; } =20 +static inline int clk_set_spread_spectrum(struct clk *clk, unsigned int mo= dfreq, + unsigned int spreadpercent, + unsigned int method, bool enable) +{ + return 0; +} + static inline long clk_round_rate(struct clk *clk, unsigned long rate) { return 0; --=20 2.35.3