linux-kernel - Re: [PATCH 3/6] arm: kconfig: don't select TWD with local timer for Armada 370/XP

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Message-ID: <50FEFAB9.4030503@gmail.com>
Date:	Tue, 22 Jan 2013 14:46:49 -0600
From:	Rob Herring <robherring2@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Matt Sealey <matt@...esi-usa.com>,
	Lior Amsalem <alior@...vell.com>, Andrew Lunn <andrew@...n.ch>,
	Ike Pan <ike.pan@...onical.com>,
	John Stultz <johnstul@...ibm.com>,
	David Marlin <dmarlin@...hat.com>,
	Yehuda Yitschak <yehuday@...vell.com>,
	Jani Monoses <jani.monoses@...onical.com>,
	Russell King <linux@....linux.org.uk>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Dan Frazier <dann.frazier@...onical.com>,
	Eran Ben-Avi <benavi@...vell.com>,
	Leif Lindholm <leif.lindholm@....com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Jason Cooper <jason@...edaemon.net>,
	Nadav Haklai <nadavh@...vell.com>,
	Jon Masters <jcm@...hat.com>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux ARM Kernel ML <linux-arm-kernel@...ts.infradead.org>,
	Chris Van Hoof <vanhoof@...onical.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Maen Suleiman <maen@...vell.com>,
	Shadi Ammouri <shadi@...vell.com>
Subject: Re: [PATCH 3/6] arm: kconfig: don't select TWD with local timer for
 Armada 370/XP

On 01/21/2013 02:44 PM, Arnd Bergmann wrote:

>> On multiplatform kernels where at least one arch has TWD support, it
>> will be included, and where not, it will not.
>>
>> It doesn't seem logical for a feature descriptor (HAVE_ARM_TWD) to
>> rely on greater knowledge of what platforms may or may not support it.
>> If we had to include every platform in that list it would be unwieldy.
> 
> I would expect that all future platforms have ARM_TWD, so the list
> of the platforms that don't is not going to grow much, but the list
> of platforms that do will keep growing.

No, I expect all future platforms will have architected timers. TWD is
pretty much A9 and A5 only I believe. Same with SCU. I've probably
missed some in my list.

Rob

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