linux-kernel - Re: [PATCH] ARM: Push selects for TWD/SCU into machine entries

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Message-ID: <20121005011237.GA17182@verge.net.au>
Date:	Fri, 5 Oct 2012 10:12:37 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Santosh Shilimkar <santosh.shilimkar@...com>
Cc:	Stephen Boyd <sboyd@...eaurora.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	Pawel Moll <pawel.moll@....com>,
	Srinidhi Kasagar <srinidhi.kasagar@...ricsson.com>,
	Tony Lindgren <tony@...mide.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Stephen Warren <swarren@...dotorg.org>,
	linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Shiraz Hashim <shiraz.hashim@...com>,
	Viresh Kumar <viresh.linux@...il.com>,
	Sascha Hauer <kernel@...gutronix.de>,
	David Brown <davidb@...eaurora.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: Push selects for TWD/SCU into machine entries

On Thu, Oct 04, 2012 at 02:41:46PM +0530, Santosh Shilimkar wrote:
> On Thursday 04 October 2012 02:20 PM, Stephen Boyd wrote:
> >The TWD and SCU configs are selected by default as long as
> >SCORPIONMP is false and/or MCT is false. Implementing the logic
> >this way certainly saves lines in the Kconfig but it precludes
> >those machines which select SCORPIONMP or MCT from participating
> >in the single zImage effort because when those machines are
> >combined with other SMP capable machines the TWD and SCU are no
> >longer selected.
> >
> >Push the select out to the machine entries so that we can compile
> >these machines together and still select the appropriate configs.
> >
> >Signed-off-by: Stephen Boyd<sboyd@...eaurora.org>
> >Cc: David Brown<davidb@...eaurora.org>
> >Cc: Kukjin Kim<kgene.kim@...sung.com>
> >Cc: Linus Walleij<linus.walleij@...aro.org>
> >Cc: Pawel Moll<pawel.moll@....com>
> >Cc: Rob Herring<rob.herring@...xeda.com>
> >Cc: Russell King<linux@....linux.org.uk>
> >Cc: Sascha Hauer<kernel@...gutronix.de>
> >Cc: Shiraz Hashim<shiraz.hashim@...com>
> >Cc: Simon Horman<horms@...ge.net.au>
> >Cc: Srinidhi Kasagar<srinidhi.kasagar@...ricsson.com>
> >Cc: Stephen Warren<swarren@...dotorg.org>
> >Cc: Tony Lindgren<tony@...mide.com>
> >Cc: Viresh Kumar<viresh.linux@...il.com>
> >---
> >
> >Does OMAP5 need to select TWD? I suspect not if it uses the
> >architected timers.
> >
> Nope. OMAP5 don't use TWD. Infact the external SCU is also used
> for A9 SOCs. You might want to check other A15 SOCS for SCU as
> well.

In that case I am a bit confused by the following result:

# git checkout v3.6
# ARCH=arm make omap2plus_defconfig
# grep '(SOC_OMAP5|_SCU|_TWD|CONFIG_SMP|CONFIG_LOCAL_TIMERS)=' .config
CONFIG_SOC_OMAP5=y
CONFIG_SMP=y
CONFIG_HAVE_ARM_SCU=y
CONFIG_HAVE_ARM_TWD=y
CONFIG_LOCAL_TIMERS=y
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