linux-kernel - Re: [PATCH v3 13/15] cpufreq: Add cpufreq driver for Tegra124

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Message-ID: <53F3A900.8010805@nvidia.com>
Date:	Tue, 19 Aug 2014 22:44:00 +0300
From:	Tuomas Tynkkynen <ttynkkynen@...dia.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>,
	Tuomas Tynkkynen <tuomas.tynkkynen@....fi>
CC:	"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>,
	Thierry Reding <thierry.reding@...il.com>,
	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>,
	Vince Hsu <vinceh@...dia.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 13/15] cpufreq: Add cpufreq driver for Tegra124

On 19/08/14 08:55, Viresh Kumar wrote:
> On 19 August 2014 09:03, Tuomas Tynkkynen <tuomas.tynkkynen@....fi> wrote:
>>  - use 'select GENERIC_CPUFREQ_CPU0', not depends
> 
> Bad :(
> 
> It *has* to be a depends here, its not optional. That was outcome of the
> chat we had last time, if I remember it well..

Okay, I misread that conversation then.

>> ---
> 
> You don't need to add these --- here, just add a blank line and git
> will take care of things for you :)

There's actually a (mis-?)feature in git format-patch: a literal '---'
line in a commit message won't be escaped, so the patch notes can be
written in the commit message directly so the patch files don't need
to be modified by hand.

>>  drivers/cpufreq/Kconfig.arm        |   8 ++
>>  drivers/cpufreq/Makefile           |   1 +
>>  drivers/cpufreq/tegra124-cpufreq.c | 206 +++++++++++++++++++++++++++++++++++++
>>  3 files changed, 215 insertions(+)
>>  create mode 100644 drivers/cpufreq/tegra124-cpufreq.c
>>
[...]
>> +static int tegra124_cpufreq_probe(struct platform_device *pdev)
>> +{
> 
>> +       priv->vdd_cpu_reg = regulator_get(get_cpu_device(0), "vdd-cpu");
> 
> get_cpu_device() can fail as well, and so you may want to check its return
> value as well..
> 

Oh, right.

>> +static int __init tegra_cpufreq_init(void)
>> +{
>> +       int ret;
>> +       struct platform_device *pdev;
>> +
>> +       if (!of_match_machine(soc_of_matches))
>> +               return -ENODEV;
> 
> You may want to add a comment here on why you chose to add another layer
> of platform device/driver.. i.e. to catch -EPROBE_DEFER from clk-APIs..
>

Yes, a good idea.

-- 
nvpublic
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