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

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Date:	Thu, 4 Oct 2012 14:41:46 +0530
From:	Santosh Shilimkar <santosh.shilimkar@...com>
To:	Stephen Boyd <sboyd@...eaurora.org>
CC:	<linux-arm-kernel@...ts.infradead.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>,
	Simon Horman <horms@...ge.net.au>,
	Viresh Kumar <viresh.linux@...il.com>,
	Sascha Hauer <kernel@...gutronix.de>,
	David Brown <davidb@...eaurora.org>
Subject: Re: [PATCH] ARM: Push selects for TWD/SCU into machine entries

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.

[..]

>   arch/arm/mach-omap2/Kconfig    | 4 ++++

[..]

> diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig
> index a6219ea..b618748 100644
> --- a/arch/arm/mach-omap2/Kconfig
> +++ b/arch/arm/mach-omap2/Kconfig
> @@ -58,7 +58,9 @@ config ARCH_OMAP4
>   	select CPU_V7
>   	select ARM_GIC
>   	select HAVE_SMP
> +	select HAVE_ARM_SCU if SMP
>   	select LOCAL_TIMERS if SMP
> +	select HAVE_ARM_TWD if LOCAL_TIMERS
>   	select PL310_ERRATA_588369
>   	select PL310_ERRATA_727915
>   	select ARM_ERRATA_720789
Ok.

> @@ -75,6 +77,8 @@ config SOC_OMAP5
>   	select CPU_V7
>   	select ARM_GIC
>   	select HAVE_SMP
> +	select HAVE_ARM_SCU if SMP
> +	select HAVE_ARM_TWD if LOCAL_TIMERS
>   	select ARM_CPU_SUSPEND if PM
>   	select SOC_HAS_REALTIME_COUNTER
>   	select ARM_ARCH_TIMER
Drop this change.

With that fixed, for OMAP changes

Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>
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