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

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Message-ID: <20121105223155.GJ28327@n2100.arm.linux.org.uk>
Date:	Mon, 5 Nov 2012 22:31:55 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Mark Langsdorf <mark.langsdorf@...xeda.com>
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 Mon, Nov 05, 2012 at 04:28:05PM -0600, Mark Langsdorf wrote:
> 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.

Hang on - what logic are you trying to achieve here?  Wouldn't:

	if (np)
		clk = of_clk_get(np, 0);
	else
		clk = clk_get_sys("smp_twd", NULL);

be sufficient?  If we have DT, why would we ever want to fall back to
"smp_twd" ?
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