From: Stephen Warren <swarren@nvidia.com>
Date: Fri, 2 Mar 2012 20:05:46 +0000 (-0700)
Subject: pinctrl: add usecount to pins for muxing
X-Git-Tag: v3.4-rc1~128^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0e3db173e2b9fd3b82246516e72c17763eb5f98d;p=pandora-kernel.git

pinctrl: add usecount to pins for muxing

Multiple mapping table entries could reference the same pin, and hence
"own" it. This would be unusual now that pinctrl_get() represents a single
state for a client device, but in the future when it represents all known
states for a device, this is quite likely. Implement reference counting
for pin ownership to handle this.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Dong Aisheng <dong.aisheng@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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