linux-kernel - Re: [RFC PATCH v2 11/15] cpufreq: kirkwood-cpufreq: remove device tree parsing for cpu nodes

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Message-ID: <20130717144355.GE1026@lunn.ch>
Date:	Wed, 17 Jul 2013 16:43:55 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Sudeep.KarkadaNagesha@....com
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	cpufreq@...r.kernel.org, linux-pm@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org,
	Russell King <linux@....linux.org.uk>,
	Shawn Guo <shawn.guo@...aro.org>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	Andrew Lunn <andrew@...n.ch>,
	Jason Cooper <jason@...edaemon.net>
Subject: Re: [RFC PATCH v2 11/15] cpufreq: kirkwood-cpufreq: remove device
 tree parsing for cpu nodes

On Wed, Jul 17, 2013 at 03:06:20PM +0100, Sudeep.KarkadaNagesha@....com wrote:
> From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@....com>
> 
> Now that the cpu device registration initialises the of_node(if available)
> appropriately for all the cpus, parsing here is redundant.
> 
> This patch removes all DT parsing and uses cpu->of_node instead.
> 
> Cc: Andrew Lunn <andrew@...n.ch>
> Cc: Jason Cooper <jason@...edaemon.net>
> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
> Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@....com>
> ---
>  drivers/cpufreq/kirkwood-cpufreq.c | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/cpufreq/kirkwood-cpufreq.c b/drivers/cpufreq/kirkwood-cpufreq.c
> index c233ea6..18aa3eb 100644
> --- a/drivers/cpufreq/kirkwood-cpufreq.c
> +++ b/drivers/cpufreq/kirkwood-cpufreq.c
> @@ -13,6 +13,7 @@
>  #include <linux/module.h>
>  #include <linux/clk.h>
>  #include <linux/clk-provider.h>
> +#include <linux/cpu.h>
>  #include <linux/cpufreq.h>
>  #include <linux/of.h>
>  #include <linux/platform_device.h>
> @@ -165,6 +166,7 @@ static struct cpufreq_driver kirkwood_cpufreq_driver = {
>  static int kirkwood_cpufreq_probe(struct platform_device *pdev)
>  {
>  	struct device_node *np;
> +	struct device *cpu_dev;
>  	struct resource *res;
>  	int err;
>  
> @@ -175,9 +177,17 @@ static int kirkwood_cpufreq_probe(struct platform_device *pdev)
>  	if (IS_ERR(priv.base))
>  		return PTR_ERR(priv.base);
>  
> -	np = of_find_node_by_path("/cpus/cpu@0");
> -	if (!np)
> +	cpu_dev = get_cpu_device(0);
> +	if (!cpu_dev) {
> +		dev_err(&pdev->dev, "failed to get cpu device\n");
>  		return -ENODEV;
> +	}
> +
> +	np = of_node_get(cpu_dev->of_node);
> +	if (!np) {
> +		dev_err(&pdev->dev, "failed to get cpu device node\n");
> +		return -ENODEV;
> +	}

Hi Sudeep

Are we not going a bit backwards here? You are replacing two lines
with 10 lines.

How about putting these 10 lines into some helper,
of_get_cpu_device()?  It would be useful for spear, kirkwood and
imx6q, and maybe others.

    Thanks
	Andrew
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