linux-kernel - Re: [PATCH v2 6/7] Watchdog: introduce ARM SBSA watchdog driver

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Date:	Mon, 25 May 2015 10:00:24 +0800
From:	Fu Wei <fu.wei@...aro.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Timur Tabi <timur@...eaurora.org>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Linaro ACPI Mailman List <linaro-acpi@...ts.linaro.org>,
	linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
	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>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, vgandhi@...eaurora.org,
	wim@...ana.be, Jon Masters <jcm@...hat.com>,
	Leo Duran <leo.duran@....com>, Jon Corbet <corbet@....net>,
	Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v2 6/7] Watchdog: introduce ARM SBSA watchdog driver

Hi, Guenter,



On 25 May 2015 at 01:32, Guenter Roeck <linux@...ck-us.net> wrote:
> On 05/24/2015 10:19 AM, Timur Tabi wrote:
>>
>> Fu Wei wrote:
>>>
>>> I don't know why you want to do this tricky way.  you can always
>>> register the interrupt handler,
>>> if pre-timeout is 0, system will just trigger WS1 right after WS0
>>
>>
>> But that only works if the pre-timeout and timeout can be programmed to
>> separate values.  And as Guenter says, the SBSA may not guarantee that.
>>
>
> The pseudo-code in the specification suggests that if WCV is configured,
>         WS0 = WCV
>         WS1 = WCV + WOR
>
> Assuming that the implementation follows the pseudo-code in the
> specification,
> we would have separately programmable values. Since the pretimeout (per ABI)
> is the difference in seconds to the timeout, and not an absolute value,
> we would have to program the registers as follows.
>
>         WCV = timeout - pretimeout;
>         WOR = pretimeout;

yes, this patchset is doing this way.

>
> Does this make sense ?
>
> Thanks,
> Guenter
>



-- 
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)
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