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Like other devfreq drivers imx8m-ddrc can measure memory bandwith usage. This is only enabled if a link is provided to the imx8m ddr pmu. This is referenced with a custom fsl,ddr-pmu property because devfreq-events was deprecated. Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com> Acked-by: Chanwoo Choi <cw00.choi@samsung.com>