From: Stephen Warren <swarren@nvidia.com>
Date: Wed, 4 Apr 2012 21:48:28 +0000 (-0600)
Subject: regmap: introduce fast_io busses, and use a spinlock for them
X-Git-Tag: v3.5-rc1~118^2~3^2~120
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a42678c4c8b5f6d489829ffc3071fa1f08ee99d1;p=pandora-kernel.git

regmap: introduce fast_io busses, and use a spinlock for them

Some bus types have very fast IO. For these, acquiring a mutex for every
IO operation is a significant overhead. Allow busses to indicate their IO
is fast, and enhance regmap to use a spinlock for those busses.

[Currently limited to native endian registers -- broonie]

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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