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

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Date:	Fri, 22 May 2015 08:01:45 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Hanjun Guo <hanjun.guo@...aro.org>, fu.wei@...aro.org,
	Suravee.Suthikulpanit@....com, 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, timur@...eaurora.org,
	ashwin.chaugule@...aro.org, vgandhi@...eaurora.org, wim@...ana.be,
	jcm@...hat.com, leo.duran@....com, corbet@....net,
	mark.rutland@....com
Subject: Re: [PATCH v2 6/7] Watchdog: introduce ARM SBSA watchdog driver

On Fri, May 22, 2015 at 04:55:04PM +0200, Arnd Bergmann wrote:
> On Friday 22 May 2015 22:50:30 Hanjun Guo wrote:
> > > diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> > > index e5e7c55..25a0df1 100644
> > > --- a/drivers/watchdog/Kconfig
> > > +++ b/drivers/watchdog/Kconfig
> > > @@ -152,6 +152,18 @@ config ARM_SP805_WATCHDOG
> > >         ARM Primecell SP805 Watchdog timer. This will reboot your system when
> > >         the timeout is reached.
> > >
> > > +config ARM_SBSA_WATCHDOG
> > > +     tristate "ARM SBSA Generic Watchdog"
> > > +     depends on ARM || ARM64 || COMPILE_TEST
> > 
> > SBSA is for ARMv8-A based (64-bit) servers, no need to depends on ARM,
> > and why we depends on COMPILE_TEST?
> > 
> 
> I think it's a reasonable assumption that someone will sooner or later
> put that hardware into an ARM32 machine, or run a 32-bit kernel on
> a chip that has it.
> 
> While SBSA requires this watchdog device, nothing prevents SoC
> manufacturers from using the same design in something that is not
> a server.
> 
Tricky, though. Since teh driver uses arm specific clock functions,
I don't think this can compile on a non-arm machine.

Guenter
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