pinctrl: add usecount to pins for muxing
authorStephen Warren <swarren@nvidia.com>
Fri, 2 Mar 2012 20:05:46 +0000 (13:05 -0700)
committerLinus Walleij <linus.walleij@linaro.org>
Mon, 5 Mar 2012 10:21:46 +0000 (11:21 +0100)
commit0e3db173e2b9fd3b82246516e72c17763eb5f98d
treece00c29c56332c925766f7f793d388b9670d802f
parent7ecdb16fe63e5b356335ebdc236adfb48cef31e1
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>
drivers/pinctrl/core.h
drivers/pinctrl/pinmux.c