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Bottomley" , "Martin K. Petersen" , Sai Krishna Potthuri , Ajay Neeli , Manivannan Sadhasivam , Pedro Sousa , Adrian Hunter , Can Guo , Asutosh Das , imx@lists.linux.dev, linux-scsi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, clizzi@redhat.com, aruizrui@redhat.com, eballetb@redhat.com, echanude@redhat.com, Frank Li References: <20261103133215.1385823-1-larisa.grigore@oss.nxp.com> <20261103133215.1385823-9-larisa.grigore@oss.nxp.com> <20261104-holistic-loon-of-agreement-db7b8f@quoll> <4e82a4bf-e2db-4a3b-bebd-9f9c473817a3@kernel.org> <17b24b80-c3bb-40a1-ad12-06242ca09c22@oss.nxp.com> <0820de78-679a-45c2-baf1-2905490ea926@kernel.org> <02fb96e2-391f-4fc3-8d41-ab8364a9b07b@oss.nxp.com> <52f8c2d3-de0a-492e-89c0-f33487a97dc8@kernel.org> Content-Language: en-US From: Larisa Ileana Grigore In-Reply-To: <52f8c2d3-de0a-492e-89c0-f33487a97dc8@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: FR4P281CA0032.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:c7::6) To GV2PR04MB12558.eurprd04.prod.outlook.com (2603:10a6:150:368::10) X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: GV2PR04MB12558:EE_|PAXPR04MB8459:EE_ X-MS-Office365-Filtering-Correlation-Id: d4a78755-98b8-4ca3-3b76-08df3fc92435 X-MS-Exchange-SharedMailbox-RoutingAgent-Processed: True X-LD-Processed: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|19092799006|366016|1800799024|376014|7416014|22082099003|18002099003|4143699003|10067099003|11063799006|261026140227099003|261028144727099003|261022105027099003|261022075727099003|56012099006|261009223027099003; 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The series only looked >>>> like a v1 because of the wrong version number. >>>> The tag ordering was changed in v10 since the patch was changed. >>>> The single 0 Hz OPP entry: as discussed on v8 [2][3], the clock rate is >>>> set outside Linux and is not scaled. The OPP table lets the UFS core >>> >>> That is not the purpose of OPP table. OPP defines performance point. >>> Performance point of 0 makes no sense. You cannot use Linux limitations >>> as reason to add some DTS, because answer is simple: fix your Linux >>> limitations. >>> >> >> Hi Krzysztof, >> >> Thanks for the clarification. I understand that an OPP table is not >> appropriate here. >> >> Existing platform DTs, such as Hi3660 and MT8195, define freq-table-hz >> containing only <0 0> pairs. This allows the UFS core to manage clock >> enable/disable without setting their rates. With freq-table-hz >> deprecated, there seems to be a gap for this use case, beyond S32N. >> > > Instead of passing 0, properties should be rather missing and that would > be hint for Linux. Is there a difference between missing properties and > some non-valid state (like freq=0)? > Hi Krzysztof, You are right, this Linux-specific distinction should not be reflected in DT, even though missing both properties currently leaves clock management to the glue driver. For v11, I will drop the OPP table and introduce ufshcd_pltfrm_init_flags(), with a flag indicating that the DT clocks have a fixed rate and should still be registered and managed by the UFS core. The existing ufshcd_pltfrm_init() will remain as a wrapper passing no flags, so existing drivers will retain their current behavior. The S32N79 driver will call the new function with this flag set. Would this approach be acceptable? Best regards, Larisa > > Best regards, > Krzysztof