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 15:14:43 +0530
From:	Pratyush Anand <panand@...hat.com>
To:	Dave Young <dyoung@...hat.com>
Cc:	fu.wei@...aro.org, Suravee.Suthikulpanit@....com,
	hanjun.guo@...aro.org, linaro-acpi@...ts.linaro.org,
	linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	tekkamanninja@...il.com, graeme.gregory@...aro.org,
	al.stone@...aro.org, arnd@...db.de, linux@...ck-us.net,
	vgandhi@...eaurora.org, wim@...ana.be, jcm@...hat.com,
	leo.duran@....com, corbet@....net, mark.rutland@....com,
	catalin.marinas@....com, will.deacon@....com, rjw@...ysocki.net,
	Geoff Levand <geoff@...radead.org>
Subject: Re: [PATCH v7 2/8] ARM64: add SBSA Generic Watchdog device node in
 foundation-v8.dts

On 15/09/2015:04:43:32 PM, Dave Young 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.
> 
> 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..

Specially if D-cache is not enabled in ARM64 kexec-tool/purgatory then its more
than 2 min. Geoff has yet not agreed [1] to take D-cache support in purgatory.

[1] https://www.mail-archive.com/kexec@lists.infradead.org/msg12881.html

~Pratyush
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