From 2adb3b8e6fa310d64ea6209f8ac5d5575839f6da Mon Sep 17 00:00:00 2001
From: Doug Anderson <dianders@chromium.org>
Date: Tue, 9 Sep 2014 16:06:04 -0700
Subject: [PATCH] mfd: rk808: Add register caching

Let's define the voltatile registers (those that can't be cached) and
enable caching.  The rk808 is accessed almost constantly with cpufreq
so this is really nice.

As measured by ftrace:
  before this change: cpu0_set_target() => ~2200us
  after this change:  cpu0_set_target() =>  ~500us

Signed-off-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Chris Zhong <zyw@rock-chips.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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