linux-kernel - Re: [PATCH v7 2/8] ARM64: add SBSA Generic Watchdog device node in foundation-v8.dts

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Date:	Tue, 15 Sep 2015 18:15:50 +0800
From:	Fu Wei <fu.wei@...aro.org>
To:	Dave Young <dyoung@...hat.com>
Cc:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Linaro ACPI Mailman List <linaro-acpi@...ts.linaro.org>,
	linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>, linux-doc@...r.kernel.org,
	Wei Fu <tekkamanninja@...il.com>,
	G Gregory <graeme.gregory@...aro.org>,
	Al Stone <al.stone@...aro.org>, Arnd Bergmann <arnd@...db.de>,
	Guenter Roeck <linux@...ck-us.net>,
	Vipul Gandhi <vgandhi@...eaurora.org>,
	Wim Van Sebroeck <wim@...ana.be>,
	Jon Masters <jcm@...hat.com>, Leo Duran <leo.duran@....com>,
	Jon Corbet <corbet@....net>,
	Mark Rutland <mark.rutland@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Rafael Wysocki <rjw@...ysocki.net>,
	Pratyush Anand <panand@...hat.com>
Subject: Re: [PATCH v7 2/8] ARM64: add SBSA Generic Watchdog device node in foundation-v8.dts

Hi Dave,

On 15 September 2015 at 16:43, Dave Young <dyoung@...hat.com> wrote:
> On 08/25/15 at 01:01am, fu.wei@...aro.org wrote:
>> From: Fu Wei <fu.wei@...aro.org>
>>
>> This can be a example of adding SBSA Generic Watchdog device node
>> into some dts files for the Soc which contains SBSA Generic Watchdog.
>>
>> Acked-by: Arnd Bergmann <arnd@...db.de>
>> Signed-off-by: Fu Wei <fu.wei@...aro.org>
>> ---
>>  arch/arm64/boot/dts/arm/foundation-v8.dts | 7 +++++++
>>  1 file changed, 7 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/arm/foundation-v8.dts b/arch/arm64/boot/dts/arm/foundation-v8.dts
>> index 4eac8dc..824431f 100644
>> --- a/arch/arm64/boot/dts/arm/foundation-v8.dts
>> +++ b/arch/arm64/boot/dts/arm/foundation-v8.dts
>> @@ -237,4 +237,11 @@
>>                       };
>>               };
>>       };
>> +     watchdog@...40000 {
>> +             compatible = "arm,sbsa-gwdt";
>> +             reg = <0x0 0x2a440000 0 0x1000>,
>> +                     <0x0 0x2a450000 0 0x1000>;
>> +             interrupts = <0 27 4>;
>> +             timeout-sec = <10 5>;
>
> I assume 10 is timeout, 5 is pre timeout, but in the driver code the default
> value is 30/10, I think the example dts[i] should use same default values as in code.

yes, that is good idea, will make them to be the same.  :-)

>
> BTW, for kdump kernel Pratyush is working on kdump on wdt enabled system.
> Basiclly we expect one configure longer timeout, and kick it in shorter
> period so we can get a chance to save vmcore. 10s sounds too short for the case..

Thanks for your info.

So that means: we may need that long timeout support in the second stage.
WOR is not enough for  the second stage in most of kdump case.

>
>> +     };
>>  };
>> --
>> 2.4.3
>>



-- 
Best regards,

Fu Wei
Software Engineer
Red Hat Software (Beijing) Co.,Ltd.Shanghai Branch
Ph: +86 21 61221326(direct)
Ph: +86 186 2020 4684 (mobile)
Room 1512, Regus One Corporate Avenue,Level 15,
One Corporate Avenue,222 Hubin Road,Huangpu District,
Shanghai,China 200021
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