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ztimer_clock are meant to be chained. At the end of the chaine there is always a timer device object (periph_rtt/rtc/timer). Since ZTIMER_MSEC and ZTIMER_USEC can be the scaled/shifted with respect to the base periph_rtt/rtc/timer it makes sense to chain other ZTIMER_XXX on top of the base rtc/timer/rtt in order to avoid chained convertions.