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: NShawn Guo <shawn.guo@linaro.org> Acked-by: NRob Herring <rob.herring@calxeda.com> Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>
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