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The MAXIM PMIC MAX77620 and MAX20024 are power management IC which supports RTC, GPIO, DCDC/LDO regulators, interrupt, watchdog etc. Add DT binding document for the different functionality of this device. Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>