In general apart from USB and DDR , both of which have the min frequency limitations noted in the datasheet, I do not think there is a minimum "internal" frequency limit for other peripherals and CPU. If you reduce the SYSCLKs/ Device speed, it will have impact on IO clocks that are derived from internal module clocks, in which case the system integrator should keep in mind the min IO clock frequency for the devices interfaced to the processor.
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