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Add devfreq support to the Tegra20 EMC driver. Memory utilization statistics will be periodically polled from the memory controller and appropriate minimum clock rate will be selected by the devfreq governor. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com> Link: https://lore.kernel.org/r/20201111011456.7875-5-digetx@gmail.com Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>