linux-kernel - Re: [PATCH v2 14/16] cpufreq: Add cpufreq driver for Tegra124

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Message-ID: <20140724091002.GA3811@ulmo.nvidia.com>
Date:	Thu, 24 Jul 2014 11:10:04 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Tuomas Tynkkynen <ttynkkynen@...dia.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Peter De Schrijver <pdeschrijver@...dia.com>,
	Prashant Gaikwad <pgaikwad@...dia.com>,
	Mike Turquette <mturquette@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Paul Walmsley <pwalmsley@...dia.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 14/16] cpufreq: Add cpufreq driver for Tegra124

On Thu, Jul 24, 2014 at 05:43:40AM +0530, Viresh Kumar wrote:
> On 24 July 2014 00:47, Tuomas Tynkkynen <ttynkkynen@...dia.com> wrote:
> > It's this:
> >
> > +static int tegra124_cpufreq_probe(struct platform_device *pdev)
> > +{
> > [...]
> > +
> > +       dfll_clk = of_clk_get_by_name(cpu_dev->of_node, "dfll");
> > +       if (IS_ERR(dfll_clk)) {
> > +               ret = PTR_ERR(dfll_clk);
> > +               goto out_put_cpu_clk;
> > +       }
> 
> This would search for clocks passed via DT, right? Why would we
> get EPROBE_DEFER for that? Sorry for the stupid question.

of_clk_get_by_name() can return -EPROBE_DEFER, which will happen if the
clock provider hasn't been registered yet.

Thierry

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