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Thu, 13 Feb 2020 22:04:10 +0000 Date: Thu, 13 Feb 2020 16:04:08 -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: <20200213220407.GA11762@tennantco.com> References: <20200205203240.13550-1-Dylan.Howey@tennantco.com> <20200208163154.4d4f6752@archlinux> Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20200208163154.4d4f6752@archlinux> User-Agent: Mutt/1.9.4 (2018-02-28) X-ClientProxiedBy: CH2PR14CA0001.namprd14.prod.outlook.com (2603:10b6:610:60::11) To CH2PR20MB3271.namprd20.prod.outlook.com (2603:10b6:610:2::30) MIME-Version: 1.0 Received: from tennantco.com (198.204.33.200) by CH2PR14CA0001.namprd14.prod.outlook.com (2603:10b6:610:60::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2729.25 via Frontend Transport; Thu, 13 Feb 2020 22:04:10 +0000 X-Originating-IP: [198.204.33.200] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: fce24397-ff1d-4dbb-5697-08d7b0d0a76a X-MS-TrafficTypeDiagnostic: CH2PR20MB2934: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:9508; X-Forefront-PRVS: 031257FE13 X-Forefront-Antispam-Report: SFV:NSPM;SFS:(10009020)(136003)(366004)(376002)(396003)(39860400002)(346002)(199004)(189003)(956004)(26005)(186003)(2616005)(6916009)(16526019)(4326008)(2906002)(36756003)(1076003)(5660300002)(33656002)(8936002)(86362001)(8676002)(81166006)(81156014)(316002)(54906003)(4744005)(7696005)(52116002)(66556008)(55016002)(66946007)(66476007)(8886007)(478600001);DIR:OUT;SFP:1101;SCL:1;SRVR:CH2PR20MB2934;H:CH2PR20MB3271.namprd20.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:1;MX:1; Received-SPF: None (protection.outlook.com: tennantco.com does not designate permitted sender hosts) X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: fZwUJDAE01TeW/ud4QmsGaiDr9i87Q8ZXjaJFeWacSyCYIrv77b/xx46qhW0QD9F+Dx+QDtY5KdEa3YwejR1uzGHO+uyO50cxvSWlPZy/iA+l5eo4sjxPpwMuVEy4mC2/hbI+THc8+xhEhNTG95b3/Cq/jEP2p94R8eUYhfWJdkDk8X32lUBlO/fOmXocEDrJUPVT0ugsiwteMC38qCdpnUxl27Tnvz/RZOL0VVaaRYaW2nDNrgjtclF79aeYo+M5MrsSSmU+do6kAX2FwVPdwwNqjk/co4+ngwno7Sw4wTLS5c0yksqk7NpXH9dPQMZ3Dpg7UGZb2PWgVcyG+qjUfpdi505ZJlpkAGc3B+W7MyqDMD4FHr5bXPtah7iDLJbqm+VVXgUp2TlSzxZIRZK0c4kIIGTEvntuId/wzBAM+OkvoV/rwZeY1trx3oJ5W+9 X-MS-Exchange-AntiSpam-MessageData: 8zJuimio5IrdskA/zpina/3OQr8JkbYL/tPQ8FrjrdVMr+upDPsnBcGhZx9UJ1Jt5Gk8jc+OjRePODmZR6LW528b1HwywbJ6FfRFF+YRFp+bJhJhO6kA5d860dy0cy3y7T0Q0w0iyUjsfIpARfi2nA== X-OriginatorOrg: tennantco.com X-MS-Exchange-CrossTenant-Network-Message-Id: fce24397-ff1d-4dbb-5697-08d7b0d0a76a X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Feb 2020 22:04:10.6443 (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: RmYfqZMc5eCugLRTATj/wgQrAUbzNUEpxz7OVovwYl4F9zLqwx1cxnON+EfAlj6OY4EdlvgV3Fq2qNnSiX1WIA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR20MB2934 Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org I tried disabling the temperature channel after every raw read, but I'm running into some issues. When the channel is disabled the data ready bits in ctrl_reg1 won't go high anymore, and I'm doing the dummy read of 33h as the datasheet says. Data ready interrupts also stop working. So something is not right with this particular hardware. If you leave the channel enabled everything works good. What are my options? I could implicitly enable the channel the first time it is used and leave it on, but it seems bad to leave the channel enabled. In that case there would be no other way to disable the channel other than to reload the module. Maybe an argument passed to the module to enable temperature output or a compile time flag to do this? -- Dylan