PM / OPP: Initialize OPP table from device tree

With a lot of devices booting from device tree nowadays, it requires
that OPP table can be initialized from device tree.  The patch adds
a helper function of_init_opp_table together with a binding doc for
that purpose.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Git-commit: b496dfbc94ab86f970ef0167eaabe51f930aa5fb
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Change-Id: Ic6919b0c58774c2e97151f0eaeef325f3f83f93e
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>
3 files changed