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

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Message-ID: <51E7BFFA.8010101@arm.com>
Date:	Thu, 18 Jul 2013 11:14:18 +0100
From:	Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@....com>
To:	Andrew Lunn <andrew@...n.ch>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>
CC:	Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.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>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	Jason Cooper <jason@...edaemon.net>
Subject: Re: [RFC PATCH v2 11/15] cpufreq: kirkwood-cpufreq: remove device
 tree parsing for cpu nodes

On 18/07/13 09:24, Sudeep KarkadaNagesha wrote:
> On 17/07/13 15:43, Andrew Lunn wrote:
>> On Wed, Jul 17, 2013 at 03:06:20PM +0100, Sudeep.KarkadaNagesha@....com wrote:
>>> From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@....com>
>>>
[...]
>>> 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.
>>
> Yes I realised that after making changes to this and pmac32 drivers. I
> have already made those changes in v3. I am waiting for more response
> before posting them.
> 
I thought of placing this helper in include/linux/of_device.h but I see:
#include <linux/of_platform.h> /* temporary until merge */

Does this mean of_platform.h and of_device.h will be merged ?
If so, which will be the final merged one ? I would like to avoid
changing all the header file inclusions later in users of this new helper.

Regards,
Sudeep


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