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Tue, 5 May 2020 19:54:49 +0000 To: Bruno Thomsen Cc: =?UTF-8?Q?Per_N=c3=b8rgaard_Christensen?= , Alexandre Belloni , LKML From: Rasmus Villemoes Subject: battery switch-over detection on pcf2127 Message-ID: Date: Tue, 5 May 2020 21:54:47 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: AM6PR08CA0017.eurprd08.prod.outlook.com (2603:10a6:20b:b2::29) To VI1PR10MB2765.EURPRD10.PROD.OUTLOOK.COM (2603:10a6:803:e1::21) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [192.168.1.149] (5.186.116.45) by AM6PR08CA0017.eurprd08.prod.outlook.com (2603:10a6:20b:b2::29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2958.20 via Frontend Transport; Tue, 5 May 2020 19:54:49 +0000 X-Originating-IP: [5.186.116.45] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 67dcf186-a968-457b-c178-08d7f12e2b56 X-MS-TrafficTypeDiagnostic: VI1PR10MB2189: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:10000; 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X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: prevas.dk X-MS-Exchange-CrossTenant-Network-Message-Id: 67dcf186-a968-457b-c178-08d7f12e2b56 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 May 2020 19:54:49.5699 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: d350cf71-778d-4780-88f5-071a4cb1ed61 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: mNymY9RRfTJewj4cZ03gQ0+g29KG8hSa8Of+dO+1VzoWchov2PN+2JTYwm5q5p6bRVIrhrTk13uxzCAokHQHCHvVIANflCQvgPTPhxgpW98= X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR10MB2189 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Bruno I just noticed your "rtc: pcf2127: add tamper detection support" (03623b4b04) from 5.4. Unfortunately, clearing the BTSE bit breaks a use case of ours: We rely on the battery switch-over detection to distinguish a powerfail during boot from a PORESET by the external watchdog (in the latter case, the RTC is still powered throughout, meaning there is no battery switch-over event). OTOH, we do not use the tamper detection - in fact, the TS signal is unconnected on our board. We're currently still on 4.19, but we will eventually upgrade to a kernel containing the above commit. So I was wondering if we could figure out a way that would work for both of us - either some CONFIG knob, or perhaps something in the device-tree. Any ideas? Rasmus