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A device's DT node or its OPP nodes can contain a phandle to other device's OPP node, in the "required-opps" property. This patch implements a routine to find that required OPP from the node that contains the "required-opps" property. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>