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Mon, 17 Feb 2020 14:19:10 +0000 Date: Mon, 17 Feb 2020 08:19:08 -0600 From: Dylan Howey To: Jonathan Cameron Cc: Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler , linux-iio@vger.kernel.org Subject: Re: [PATCH] iio: accel: mma8452: Expose temperature channel Message-ID: <20200217141902.GA31535@tennantco.com> References: <20200205203240.13550-1-Dylan.Howey@tennantco.com> <20200208163154.4d4f6752@archlinux> <20200213220407.GA11762@tennantco.com> <20200214132400.7133bcf5@archlinux> Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20200214132400.7133bcf5@archlinux> User-Agent: Mutt/1.9.4 (2018-02-28) X-ClientProxiedBy: CH2PR03CA0007.namprd03.prod.outlook.com (2603:10b6:610:59::17) To CH2PR20MB3271.namprd20.prod.outlook.com (2603:10b6:610:2::30) MIME-Version: 1.0 Received: from tennantco.com (198.204.33.200) by CH2PR03CA0007.namprd03.prod.outlook.com (2603:10b6:610:59::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2729.22 via Frontend Transport; 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X-Microsoft-Antispam-Message-Info: uYLVC1a4rh1JdOVRd3//+KBTH7vZuwW0m9nIndce0uJrn9PR0zQ4JJq91RvGB4Rl29NdhwdUxzwPLlxZa4zEHY12IEKIE6ZV4dj0vwCWPgqqBXu5MgAbhmGBmroDsne5YK9FSUOrFUcG3QnjPrQzEvMVIugd3DiRmMTB+zFaJWGkKdvddZF7dEzQFslRh+vnX4gv5T+iyDOJ69qALXMsdMJqasy+7oS4EI3e6s8Wr3SbyTsQpfxOdKcdh+qwixk68zTb+/9L/Ic+LBQ5aS75w23gBuRNOmHz+aV0PzGrNQXJhXcVUhY4UK1sMsqkrTnosfESbzU/vdbv+qAphLVvZXH3QIlivQGtwrr75p6xGUT7awVZSfBao5wLPJGpAMILhfJi1Jk6e8ZRArwzc8CSEv7Gg4jJPHf4UiACoi92Hhx4OchO80KIqzjU3BjUyiDG X-MS-Exchange-AntiSpam-MessageData: 2bFrbdY5hCfjTAXqynBD4nFFGd23K69XxcGRpj0i7cSjR+oZ8NvYjG16liTS1LOlFrQsvSqTp5fR1MVIeNiotjNDVmixwkee4w8pD7kKlGsd/auceFGeS167y5/FhBYwi1SWP/2LacAN0xOLlSnWpQ== X-OriginatorOrg: tennantco.com X-MS-Exchange-CrossTenant-Network-Message-Id: 44ef8c19-a566-4f09-d0db-08d7b3b45b1d X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Feb 2020 14:19:10.1719 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 854ee4fb-bf50-420c-8a26-5b96d626ac37 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: tA+VUEHNLV2i49BOteapr/KV+zaQBEai1TzE7Azxl0J/j/PsjuikJfUrQruzRR3KD4CXAZjm85lSVgg85+3wlg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR20MB3126 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org On 02/14/2020 13:24, Jonathan Cameron wrote: > So ideally we'd get someone at Freescale to confirm there is a hardware > rather than a documentation issue (i.e. maybe we need some other magic). I'll try that route first. I have an NXP contact. > If they do we probably need to avoid breaking them so would need a module > parameter to be 'enable temp' rather than the more natural option > of 'disable temp' to be set only by people who need the highest > frequency. That's what I had in mind. > The question is whether anyone actually cares about 800Hz? I have a use case for this. I'm doing some data logging with this hardware and a higher sample rate is always better. By the way, this hardware has a fifo that the driver isn't using. I might add support for that. Currently I'm trying to log and getting hammered with an 800Hz interrupt and that is causing some issues. -- Dylan