linux-kernel - Re: [PATCH V2] cpufreq: ARM big LITTLE: Add generic cpufreq driver and its DT glue

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Message-ID: <513CAD9B.908@gmail.com>
Date:	Sun, 10 Mar 2013 16:58:19 +0100
From:	Francesco Lavra <francescolavra.fl@...il.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
CC:	rjw@...k.pl, Steve.Bannister@....com, linux@....linux.org.uk,
	linux-pm@...r.kernel.org,
	Sudeep KarkadaNagesha <sudeep.karkadanagesha@....com>,
	devicetree-discuss@...ts.ozlabs.org, Liviu.Dudau@....com,
	linux-kernel@...r.kernel.org, cpufreq@...r.kernel.org,
	robin.randhawa@....com, linux-arm-kernel@...ts.infradead.org,
	mark.hambleton@...adcom.com, linaro-kernel@...ts.linaro.org,
	charles.garcia-tobin@....com
Subject: Re: [PATCH V2] cpufreq: ARM big LITTLE: Add generic cpufreq driver
 and its DT glue

Hi,
On 03/07/2013 06:14 PM, Viresh Kumar wrote:
> big LITTLE is ARM's new Architecture focussing power/performance needs of modern
> world. More information about big LITTLE can be found here:
> 
> http://www.arm.com/products/processors/technologies/biglittleprocessing.php
> http://lwn.net/Articles/481055/
> 
> In order to keep cpufreq support for all big LITTLE platforms simple/generic,
> this patch tries to add a generic cpufreq driver layer for all big LITTLE
> platforms.
> 
> The driver is divided into two parts:
> - Core driver: Generic and shared across all big LITTLE SoC's
> - Glue drivers: Per platform drivers providing ops to the core driver
> 
> This patch adds in a generic glue driver which would extract information from
> Device Tree.
> 
> Future SoC's can either reuse the DT glue or write their own depending on the
> need.
> 
> Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@....com>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
[...]
> +void bL_cpufreq_unregister(struct cpufreq_arm_bL_ops *ops)
> +{
> +	if (arm_bL_ops != ops) {
> +		pr_info("%s: Registered with: %s, can't unregister, exiting\n",
> +				__func__, arm_bL_ops->name);
> +	}

The code is not doing what the info message says.

> +
> +	cpufreq_unregister_driver(&bL_cpufreq_driver);
> +	pr_info("%s: Un-registered platform driver: %s\n", __func__,
> +			arm_bL_ops->name);
> +	arm_bL_ops = NULL;
> +}
> +EXPORT_SYMBOL_GPL(bL_cpufreq_unregister);

--
Francesco
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