linux-kernel - Re: [PATCH 1/6 v2] arm: use devicetree to get smp

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Date:	Mon, 05 Nov 2012 16:28:05 -0600
From:	Mark Langsdorf <mark.langsdorf@...xeda.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/6 v2] arm: use devicetree to get smp_twd clock

On 11/04/2012 04:08 AM, Russell King - ARM Linux wrote:
> On Fri, Nov 02, 2012 at 01:51:44PM -0500, Mark Langsdorf wrote:
>> -static struct clk *twd_get_clock(void)
>> +static struct clk *twd_get_clock(struct device_node *np)
>>  {
>> -	struct clk *clk;
>> +	struct clk *clk = NULL;
>>  	int err;
>>  
>> -	clk = clk_get_sys("smp_twd", NULL);
>> +	if (np)
>> +		clk = of_clk_get(np, 0);
>> +	if (!clk)
> 
> What does a NULL return from of_clk_get() mean?  Where is this defined?

Well, it's a valid path if (np) is NULL. I'll add an IS_ERR(clk) and
resubmit.

>> @@ -349,6 +348,10 @@ int __init twd_local_timer_register(struct twd_local_timer *tlt)
>>  	if (!twd_base)
>>  		return -ENOMEM;
>>  
>> +	twd_clk = twd_get_clock(NULL);
>> +
>> +	twd_clk = twd_get_clock(NULL);
>> +
> 
> Why twice?

No good reason. I'll resubmit with it cleaned up. Thanks for the review.

--Mark Langsdorf
Calxeda, Inc.

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