linux-kernel - Re: [PATCH v2 02/11] drivercore: Bind/unbind power domain on probe/remove

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Message-ID: <CA+gwMceHSD6-dqsehDuwhVLwdNxdaRVteA=EA9UvhYMjB+xKWQ@mail.gmail.com>
Date:	Tue, 4 Mar 2014 20:17:41 +0100
From:	Philipp Zabel <philipp.zabel@...il.com>
To:	Tomasz Figa <tomasz.figa@...il.com>
Cc:	linux-pm@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Len Brown <len.brown@...el.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Tomasz Figa <t.figa@...sung.com>, Pavel Machek <pavel@....cz>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	linux-samsung-soc@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	devicetree@...r.kernel.org, Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Mark Brown <broonie@...nel.org>,
	Kumar Gala <galak@...eaurora.org>
Subject: Re: [PATCH v2 02/11] drivercore: Bind/unbind power domain on probe/remove

Hi Tomasz,

On Mon, Mar 3, 2014 at 5:02 PM, Tomasz Figa <tomasz.figa@...il.com> wrote:
> On a number of platforms, devices are part of controllable power
> domains, which need to be enabled before such devices can be accessed
> and may be powered down when the device is idle to save some power.
> This means that on systems that support power domain control using
> generic power domains subsystem, it is necessary to add device to its
> power domain before binding a driver to it and remove it from its power
> domain after its driver is unbound to make sure that an unused device
> does not affect power domain state.
>
> Since this is not limited to particular busses and specific
> archs/platforms, it is more convenient to do the above directly in
> driver core, just as done with pinctrl default configuration. This patch
> adds necessary code to really_probe() and __device_release_driver() to
> achieve this and maintain consistent stack-like ordering of operations
> happening when binding and unbinding a driver.
>
> Signed-off-by: Tomasz Figa <tomasz.figa@...il.com>

patches 01 and 02
Reviewed-by: Philipp Zabel <philipp.zabel@...il.com>
Tested-by: Philipp Zabel <philipp.zabel@...il.com>
on i.MX6 GK802.

regards
Philipp
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