linux-kernel - Re: [PATCH V2 0/6] arm_smp_twd: mpcore

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Message-ID: <20110706101456.GN8286@n2100.arm.linux.org.uk>
Date:	Wed, 6 Jul 2011 11:14:56 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	Vitaly Kuzmichev <vkuzmichev@...sta.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
	Wim Van Sebroeck <wim@...ana.be>,
	"arm@...nel.org" <arm@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	John Stultz <johnstul@...ibm.com>,
	Nicolas Pitre <nico@...xnic.net>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH V2 0/6] arm_smp_twd: mpcore_wdt: Fix MPCORE watchdog
	setup

On Wed, Jul 06, 2011 at 11:05:51AM +0100, Marc Zyngier wrote:
> Hi Vitaly,
> 
> On 05/07/11 20:00, Vitaly Kuzmichev wrote:
> > The series of patches fixes various bugs in ARM MPCORE watchdog setup.
> > They also introduce some changes in common ARM_SMP_TWD timer setup code.
> > The PATCH 2/6 adds an exported function to obtain twd timer rate in
> > mpcore_wdt. However, this solution might be unacceptable, and the
> > better is to copy calibration loop and clk_get_rate calling to mpcore_wdt.
> 
> My take on this is that the calibration loop should simply be killed
> once Colin's patch using the "smp_twd" clock is merged and relevant
> platforms updated. Once this is done, the watchdog driver should use the
> clock directly, without exporting a symbol.

Do we know why the calibration was initially introduced?  FWIR, it came
from the SMP group in ARM, so I guess they had a reason for it rather
than copying x86.
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