From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Warren <swarren@wwwdotorg.org>
Subject: Re: [PATCH] ASoC: ak4554: add DT support
Date: Fri, 05 Jul 2013 10:55:57 -0600
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References: <87wqp5wwuy.wl%kuninori.morimoto.gx@renesas.com>
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To: Lars-Peter Clausen <lars@metafoo.de>
Cc: Linux-ALSA <alsa-devel@alsa-project.org>, Stephen Warren <swarren@nvidia.com>, Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>, Mark Brown <broonie@kernel.org>, Liam Girdwood <lgirdwood@gmail.com>, Simon <horms@verge.net.au>, Kuninori Morimoto <kuninori.morimoto.gx@gmail.com>
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On 07/05/2013 03:37 AM, Lars-Peter Clausen wrote:
>> +  - compatible : "asahi-kasei,ak4554"
> 
> The vendor prefix for Asahi Kasei is documented as "ak" in
> Documentation/devicetree/bindings/vendor-prefixes.txt. But it doesn;t seem
> to be used in any upstream drivers, Stephen add that prefix maybe he knows
> if it is used. If it is unused you should probably send a patch updating the
> Documentation.

It's used at:

arch/arm/boot/dts/tegra20-seaboard.dts:499: compatible = "ak,ak8975";

... although I see that somebody has incorrectly modified
./drivers/iio/magnetometer/ak8975.c to support the "asahi-kasei," vendor
prefix:-(