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Sending RPMH requests and waiting for response from the controller through a callback is common functionality across all platform drivers. To simplify drivers, add a library functions to create RPMH client and send resource state requests. rpmh_write() is a synchronous blocking call that can be used to send active state requests. Signed-off-by: Lina Iyer <ilina@codeaurora.org> Signed-off-by: Raju P.L.S.S.S.N <rplsssn@codeaurora.org> Signed-off-by: Andy Gross <andy.gross@linaro.org>