From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Boyd <sboyd@codeaurora.org>
Subject: Re: [PATCH v2 02/11] drivercore: Bind/unbind power domain on
 probe/remove
Date: Tue, 4 Mar 2014 10:29:22 -0800
Message-ID: <20140304182922.GB9985@codeaurora.org>
References: <1393862536-9842-1-git-send-email-tomasz.figa@gmail.com>
 <1393862536-9842-3-git-send-email-tomasz.figa@gmail.com>
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To: Tomasz Figa <tomasz.figa@gmail.com>
Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, "Rafael J. Wysocki" <rjw@rjwysocki.net>, Pavel Machek <pavel@ucw.cz>, Len Brown <len.brown@intel.com>, Russell King <linux@arm.linux.org.uk>, Kukjin Kim <kgene.kim@samsung.com>, Kumar Gala <galak@codeaurora.org>, Ian Campbell <ijc+devicetree@hellion.org.uk>, Mark Rutland <mark.rutland@arm.com>, Pawel Moll <pawel.moll@arm.com>, Rob Herring <robh+dt@kernel.org>, Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>, Stephen Warren <swarren@wwwdotorg.org>, Tomasz Figa <t.figa@samsung.com>, Mark Brown <broonie@kernel.org>, Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>, Ulf Hansson <ulf.hansson@linaro.org>, Marek Szyprowski <m.szyprowski@samsung.com>
List-Id: devicetree@vger.kernel.org

On 03/03, Tomasz Figa 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@gmail.com>

Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>

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