linux-kernel - Re: [PATCH 1/2] watchdog: dw_wdt: pat the watchdog before enabling it

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Date:	Mon, 26 Jan 2015 20:07:51 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Jisheng Zhang <jszhang@...vell.com>,
	Doug Anderson <dianders@...omium.org>
CC:	Wim Van Sebroeck <wim@...ana.be>, Heiko Stuebner <heiko@...ech.de>,
	Lunxue Dai <lunxue.dai@...k-chips.com>,
	Dinh Nguyen <dinguyen@...era.com>,
	"linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] watchdog: dw_wdt: pat the watchdog before enabling
 it

On 01/26/2015 07:44 PM, Jisheng Zhang wrote:
> Dear Doug,
>
> On Mon, 26 Jan 2015 09:01:37 -0800
> Doug Anderson <dianders@...omium.org> wrote:
>
>> Jisheng,
>>
>> On Sun, Jan 25, 2015 at 10:22 PM, Jisheng Zhang <jszhang@...vell.com> wrote:
>>>> Specifically I see the register WDT_TORR that has an offset of 0x4.
>>>> That's the RANGE_REG in your code.  It shows bits 3:0 set the timeout
>>>> period (0 = 0xffff and 15 = 0x7fffffff).  It shows bits 31:4 as
>>>> "reserved".
>>>
>>> Could you please dump registers' value at offset 0xf4 and 0xf8 if you
>>> don't mind?
>>
>> Those are not documented in the user manual that I have, but:
>>
>>>>> r(0xff8000f4)
>> 0x10000a02
>>>>> r(0xff8000f8)
>> 0x3130332a
>
Hi Jisheng,

This translates to ascii "103*". How does it translate to "1.02a" ?

> Thanks. Now I got some information about your platform:
>
> wdt version: v1.02a
>
> WDT_DUAL_TOP is configured as false, so there's no TOP_INIT
> WDT_DFLT_TOP is configured as 0, so it will timeout soon.
>
Any chance you can provide the bit map for the register reporting
those flags ?

Thanks,
Guenter

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