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Date:	Thu, 11 Jun 2015 11:00:53 +0800
From:	Fu Wei <>
To:	Timur Tabi <>
Cc:	Guenter Roeck <>,
	Suravee Suthikulpanit <>,
	Linaro ACPI Mailman List <>,,,,,
	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 <>,
Subject: Re: [PATCH v4 5/7] Watchdog: introduce ARM SBSA watchdog driver

On 11 June 2015 at 08:22, Timur Tabi <> wrote:
> Fu Wei wrote:
>> If we make the first stage timeout is timeout/2,  this violates the
>> definition of timeout.
> The documentation says that the hardware needs to reset after the timeout
> expires.

yes , you are absolutely on this. Great thanks for point out this.
my patch is doing this way: trigger WS1 at the timeout expires
Before that, using pretimeout for WS0 as an warning.

> If you program the hardware to timeout/2, the driver can ignore
> WS0 and allow WS1 to reset the hardware.  That conforms to the
> documentation.

yes, technically we can do nothing in WS0, and just wait for WS1.
So SBSA watchdog become a one stage timeout watchdog, right?
So if user want the WS0 warning, How to make driver know that, and do
something in WS0 routine?
I think by this way,  two stage timeouts, WS0 "alert" will be meaningless.

Could you suggest a good way to use WS0, so we can follow SBSA spec?

> --
> Sent by an employee of the Qualcomm Innovation Center, Inc.
> The Qualcomm Innovation Center, Inc. is a member of the
> Code Aurora Forum, hosted by The Linux Foundation.

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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