linux-kernel - Re: [PATCH v2 1/9] i2c: prepare runtime PM support for I2C client devices

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Message-ID: <20130913103152.GE29403@sirena.org.uk>
Date:	Fri, 13 Sep 2013 11:31:52 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	Kevin Hilman <khilman@...aro.org>, linux-i2c@...r.kernel.org,
	Wolfram Sang <wsa@...-dreams.de>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Lv Zheng <lv.zheng@...el.com>, Aaron Lu <aaron.lu@...el.com>,
	linux-arm-kernel@...ts.infradead.org,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: [PATCH v2 1/9] i2c: prepare runtime PM support for I2C client
 devices

On Fri, Sep 13, 2013 at 01:16:11PM +0300, Mika Westerberg wrote:
> On Fri, Sep 13, 2013 at 10:59:50AM +0100, Mark Brown wrote:

> > Accessing the bus isn't an issue for I2C outside of ACPI, the power
> > management of the device is totally disassociated from the bus and the
> > controller is responsible for ensuring it is available during transfers.

> Yes, but since we want to support ACPI as well, we must make sure that the
> adapter (and the associated controller) is available when client ->probe()
> is called.

Right, but this probably needs to be highlighted more since it's a very
surprising thing for I2C and is causing confusion.

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