linux-kernel - Re: [Patch v2 2/4] driver: cpuidle: cpuidle-big-little: init driver for Exynos5420

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Message-ID: <20140423163228.GC1243@e102568-lin.cambridge.arm.com>
Date:	Wed, 23 Apr 2014 17:32:28 +0100
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Chander Kashyap <chander.kashyap@...aro.org>
Cc:	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"kgene.kim@...sung.com" <kgene.kim@...sung.com>,
	Chander Kashyap <k.chander@...sung.com>
Subject: Re: [Patch v2 2/4] driver: cpuidle: cpuidle-big-little: init driver
 for Exynos5420

On Wed, Apr 23, 2014 at 10:25:52AM +0100, Chander Kashyap wrote:
> Add "samsung,exynos5420" compatible string to initialize generic
> big-little cpuidle driver for Exynos5420.
> 
> Signed-off-by: Chander Kashyap <chander.kashyap@...aro.org>
> Signed-off-by: Chander Kashyap <k.chander@...sung.com>
> Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> ---
>  drivers/cpuidle/cpuidle-big_little.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/cpuidle/cpuidle-big_little.c b/drivers/cpuidle/cpuidle-big_little.c
> index b45fc62..d0fac53 100644
> --- a/drivers/cpuidle/cpuidle-big_little.c
> +++ b/drivers/cpuidle/cpuidle-big_little.c
> @@ -170,7 +170,8 @@ static int __init bl_idle_init(void)
>  	/*
>  	 * Initialize the driver just for a compliant set of machines
>  	 */
> -	if (!of_machine_is_compatible("arm,vexpress,v2p-ca15_a7"))
> +	if (!of_machine_is_compatible("arm,vexpress,v2p-ca15_a7") &&
> +		(!of_machine_is_compatible("samsung,exynos5420")))
>  		return -ENODEV;

We should handle the string matching differently, we can't keep adding
comparisons.

Daniel raised the point already: what about the idle tables (data and
number of states ?). TC2 has just a cluster state, and specific
latencies, which are highly unlikely to be correct for this platform.

Lorenzo

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