linux-kernel - Re: [PATCH v4] i2c: enable runtime PM for I2C adapter devices enumerated from ACPI

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Message-ID: <20131005103106.GX27287@sirena.org.uk>
Date:	Sat, 5 Oct 2013 11:31:06 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
	rjw@...ysocki.net, Aaron Lu <aaron.lu@...el.com>,
	Lv Zheng <lv.zheng@...el.com>,
	Kevin Hilman <khilman@...aro.org>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH v4] i2c: enable runtime PM for I2C adapter devices
 enumerated from ACPI

On Sat, Oct 05, 2013 at 11:09:01AM +0300, Mika Westerberg wrote:

> It looks like Windows actually powers the I2C controller off independently
> of the I2C client power state. We should probably do the same in Linux even
> though it is not following what the ACPI spec says (but makes sense with
> serial buses like I2C and SPI).

Sounds like it's probably worth going to the effort of getting the spec
amended...

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