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

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Message-ID: <20150127123623.7e93b5f4@xhacker>
Date:	Tue, 27 Jan 2015 12:36:23 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	Guenter Roeck <linux@...ck-us.net>
CC:	Doug Anderson <dianders@...omium.org>,
	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 Mon, 26 Jan 2015 20:07:51 -0800
Guenter Roeck <linux@...ck-us.net> wrote:

> 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" ?

aha, yes. wdt version is v1.03* ;)

> 
> > 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 ?

will do in Doug's v2 patch thread

Thanks,
Jisheng
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