linux-kernel - Re: [PATCH] spi/atmel: add support for runtime PM

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Date:	Fri, 17 Oct 2014 07:22:09 -0700
From:	Kevin Hilman <khilman@...nel.org>
To:	Mark Brown <broonie@...nel.org>
Cc:	Wenyou Yang <wenyou.yang@...el.com>, linux-spi@...r.kernel.org,
	linux-kernel@...r.kernel.org, nicolas.ferre@...el.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] spi/atmel: add support for runtime PM

Mark Brown <broonie@...nel.org> writes:

> On Fri, Oct 17, 2014 at 06:02:35AM -0700, Kevin Hilman wrote:
>> Wenyou Yang <wenyou.yang@...el.com> writes:
>
>> > +	if (!pm_runtime_suspended(dev)) {
>> > +		clk_disable_unprepare(as->clk);
>> > +		pinctrl_pm_select_sleep_state(dev);
>> > +	}
>
>> a.k.a. pm_runtime_put_sync() since the ->runtime_suspend() callback does
>> the same thing.
>
> Will that do the right thing when runtime PM is disabled in Kconfig?

Good point.

Then the way to make this cleaner, and obvious on inspection that system
suspend/resume are doing the same thing as runtime suspend/resume is to
have ->suspend call the runtime_suspend function.

The runtime suspend/resume functions then should be wrapped in CONFIG_PM
instead of CONFIG_PM_RUNTIME.

Kevin
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