linux-kernel - Re: [PATCH V3 1/8] cpufreq: cpufreq-cpu0: remove dependency on thermal

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Date:	Fri, 23 May 2014 10:03:27 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Eduardo Valentin <edubezval@...il.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arvind Chauhan <arvind.chauhan@....com>,
	Ips Gandhi <inderpal.s@...sung.com>,
	Nishanth Menon <nm@...com>,
	Chander Kashyap <chander.kashyap@...aro.org>,
	Pavel Machek <pavel@....cz>,
	"Brown, Len" <len.brown@...el.com>,
	Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH V3 1/8] cpufreq: cpufreq-cpu0: remove dependency on thermal

On 22 May 2014 20:22, Eduardo Valentin <edubezval@...il.com> wrote:
> However, on CPUs that needs thermal managment, it makes sense to have
> such dependency, from functional perspective. Mainly because scaling
> frequency and voltage up would be allowed only when thermal management
> is enabled.

AFAIK, dependencies in KCONFIG are only for fixing compilation time issues.
As some APIs wouldn't be available without enabling some config options..

If drivers fail at runtime because some API returned error, fix it for your
platform instead and not bug KCONFIG for that.

Thought we might consider some runtime dependencies here as well. For
example regulators. There probably are dummy routine available for cases
where CONFIG_REGULATOR (or whatever) isn't enabled and driver would
still compile, but it is guaranteed to fail as we don't continue when we get
errors from regulator APIs..

Though I still feel that this driver should still support platforms without
regulators (atleast in software, they might always have them on board :))..
And so dependencies for regulators may also die out one day..

The dependencies here mean: "This driver would never ever work/compile
if the dependencies aren't met.."
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