linux-kernel - Re: [PATCH] powerpc: Make Book E watchdog reset type configurable

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Message-ID: <20130503203335.GA13417@roeck-us.net>
Date:	Fri, 3 May 2013 13:33:35 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Dirk Eibach <dirk.eibach@...ys.cc>
Cc:	linux-kernel@...r.kernel.org,
	Kumar Gala <galak@...nel.crashing.org>,
	Wim Van Sebroeck <wim@...ana.be>,
	linux-watchdog@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH] powerpc: Make Book E watchdog reset type configurable

On Fri, May 03, 2013 at 08:30:03PM +0200, Dirk Eibach wrote:
> 
> 
> Am 03.05.2013 15:46, schrieb Guenter Roeck:
> >On Fri, May 03, 2013 at 10:33:13AM +0200, Dirk Eibach wrote:
> >>Hi Guenter,
> >>
> >>>>>>diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> >>>>>>index e89fc31..6048593 100644
> >>>>>>--- a/drivers/watchdog/Kconfig
> >>>>>>+++ b/drivers/watchdog/Kconfig
> >>>>>>@@ -1172,6 +1172,38 @@ config BOOKE_WDT_DEFAULT_TIMEOUT
> >>>>>>
> >>>>>>	  The value can be overridden by the wdt_period command-line
> >>>>>>parameter.
> >>>>>>
> >>>>>>+choice
> >>>>>>+	prompt "PowerPC Book-E Watchdog reset type"
> >>>>>>+	depends on BOOKE_WDT
> >>>>>>+	default BOOKE_WDT_RESET_CHIP
> >>>>>>+	help
> >>>>>>+	  Specify what kind of reset will be executed on watchdog
> >>>>>>timeout.
> >>>>>>+
> >>>>>Seems to me it would be much better to make this configurable via
> >>>>>platform data
> >>>>>and/or device tree.
> >>>>
> >>>>good catch. What do the device-tree gurus think to be a nice
> >>>>property name?
> >>
> >>having a closer look, I realized booke_wdt is not device-tree based
> >>yet. Migrating it would come close to a rewrite, breaking
> >>compatibility for all current users. Sorry, this is way beyond the
> >
> >Really ? I don't think making it a platform driver would be that hard,
> >or break anything.
> 
> Maybe I am missing something, but wouldn't making it a device-tree
> driver mean, that I would have to identify all users of BOOKE_WDT
> and add it to their device trees?
> 
Not necessarily; only if the platform driver doesn't auto-instantiate.
I'll play with it and see if I can get it working.

On the other side, that wouldn't be too bad either. As far as I can see
from a quick search, there is no default configuration in the upstream kernel
which has BOOKE_WDT enabled.

Guenter
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