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

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Date:	Tue, 22 Jan 2013 21:19:23 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Rob Herring <robherring2@...il.com>
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 Tuesday 22 January 2013, Rob Herring wrote:
> 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.

Ah, I was incorrectly assuming that TWD was referring to the architected
timers, sorry about that.

Maybe we should do this differently then and do the more logical

config LOCAL_TIMERS
	bool

config ARM_TWD
	bool "ARM TWD local timer"
	depends on SMP && CPU_V7
	select LOCAL_TIMERS

config EXYNOS4_MCT
	bool "Samsung Exynos4 MCT Timer"
	depends on SMP && ARCH_EXYNOS
	select LOCAL_TIMERS

config MSM_LOCAL_TIMER
	bool "Qualcomm MSM Local Timer"
	depends on SMP && ARCH_MSM
	select LOCAL_TIMERS

That way we have no implicit assumptions. Everything will still work if you
disable local timers, but of course we will enable them in the defconfigs.

	Arnd
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