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RBCPR (RapidBridge Core Power Reduction) is a technology to reduce core power on a cpu or a core. It takes voltage suggestions in efuse from product test process as initial settings. It supports "corner" vote mechanism and converts corner value to voltage before writing to a voltage regulator API, such as that provided by spm-regulator driver. This patch only adds basic code as a regulator driver and to support efuse reading and initial voltage settings for corners. CPR support will be added in a separate patch. Change-Id: I98896fb00e9864d849498d0446cd2aae4af95f58 Signed-off-by: Willie Ruan <wruan@codeaurora.org>