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The ACTMON watches activity of memory clients. Decisions about a minimum required frequency are made based on the info from ACTMON. We can use ACTMON as a thermal cooling device by limiting the required frequency. Document new cooling-cells property of NVIDIA Tegra ACTMON hardware unit. Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Acked-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>