From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from bh-25.webhostbox.net ([208.91.199.152]:58946 "EHLO bh-25.webhostbox.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750905AbbFKFN7 (ORCPT ); Thu, 11 Jun 2015 01:13:59 -0400 Message-ID: <5579190E.8000803@roeck-us.net> Date: Wed, 10 Jun 2015 22:13:50 -0700 From: Guenter Roeck MIME-Version: 1.0 To: Timur Tabi , Fu Wei CC: Suravee Suthikulpanit , Linaro ACPI Mailman List , linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Wei Fu , G Gregory , Al Stone , Hanjun Guo , Ashwin Chaugule , Arnd Bergmann , Vipul Gandhi , Wim Van Sebroeck , Jon Masters , Leo Duran , Jon Corbet , Mark Rutland , Catalin Marinas , Will Deacon , rjw@rjwysocki.net Subject: Re: [PATCH v4 5/7] Watchdog: introduce ARM SBSA watchdog driver References: <=fu.wei@linaro.org> <1433217907-928-1-git-send-email-fu.wei@linaro.org> <1433217907-928-6-git-send-email-fu.wei@linaro.org> <556DCC95.806@codeaurora.org> <556DE2D5.3090906@roeck-us.net> <5575DE48.8010308@roeck-us.net> <55766D74.2060401@roeck-us.net> <55769E0E.8060801@roeck-us.net> <557712CF.8010802@roeck-us.net> <5577147B.2030900@codeaurora.org> <5577180E.4070804@roeck-us.net> <5578D4D5.3070109@codeaurora.org> <55790455.7090809@codeaurora.org> In-Reply-To: <55790455.7090809@codeaurora.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-watchdog-owner@vger.kernel.org List-Id: linux-watchdog@vger.kernel.org On 06/10/2015 08:45 PM, Timur Tabi wrote: > Fu Wei wrote: >> Could you suggest a good way to use WS0, so we can follow SBSA spec? > > To avoid the timeout/2 problem, WS0 calls panic, which is the "real" timeout/reset. WS1 is then a "backup" that is ignored by the driver. That is, the driver doesn't do anything with WS1 and it doesn't tell the kernel about WS1. > > I know you don't like the idea of WS1 as a backup timeout, but this is one way to solve the problem. > This is what I would do. Guenter From mboxrd@z Thu Jan 1 00:00:00 1970 From: Guenter Roeck Subject: Re: [PATCH v4 5/7] Watchdog: introduce ARM SBSA watchdog driver Date: Wed, 10 Jun 2015 22:13:50 -0700 Message-ID: <5579190E.8000803@roeck-us.net> References: <=fu.wei@linaro.org> <1433217907-928-1-git-send-email-fu.wei@linaro.org> <1433217907-928-6-git-send-email-fu.wei@linaro.org> <556DCC95.806@codeaurora.org> <556DE2D5.3090906@roeck-us.net> <5575DE48.8010308@roeck-us.net> <55766D74.2060401@roeck-us.net> <55769E0E.8060801@roeck-us.net> <557712CF.8010802@roeck-us.net> <5577147B.2030900@codeaurora.org> <5577180E.4070804@roeck-us.net> <5578D4D5.3070109@codeaurora.org> <55790455.7090809@codeaurora.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <55790455.7090809@codeaurora.org> Sender: linux-doc-owner@vger.kernel.org To: Timur Tabi , Fu Wei Cc: Suravee Suthikulpanit , Linaro ACPI Mailman List , linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Wei Fu , G Gregory , Al Stone , Hanjun Guo , Ashwin Chaugule , Arnd Bergmann , Vipul Gandhi , Wim Van Sebroeck , Jon Masters , Leo Duran , Jon Corbet , Mark Rutland , Catalin Marinas , Will Deacon , rjw@rjwysocki.net List-Id: devicetree@vger.kernel.org On 06/10/2015 08:45 PM, Timur Tabi wrote: > Fu Wei wrote: >> Could you suggest a good way to use WS0, so we can follow SBSA spec? > > To avoid the timeout/2 problem, WS0 calls panic, which is the "real" timeout/reset. WS1 is then a "backup" that is ignored by the driver. That is, the driver doesn't do anything with WS1 and it doesn't tell the kernel about WS1. > > I know you don't like the idea of WS1 as a backup timeout, but this is one way to solve the problem. > This is what I would do. Guenter