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This is used by the imx-ddrc devfreq driver to implement dynamic frequency scaling of DRAM. Support for proactive scaling via interconnect will come later. The high-performance bus masters which need that (display, vpu, gpu) are mostly not yet enabled in upstream anyway. Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com> Signed-off-by: Shawn Guo <shawnguo@kernel.org>