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The software stack used for each application may vary depending on the use-case. Xilinx supports runtime power management for Linux and bare-metal applications. All required drivers and libraries are available from Xilinx. Using these runtime PM features in software is critical to achieving lower power consumption. There is an example which demonstrates the typical power states that can be achieved using Xilinx provided software stack here: Typical Power States for 2020.2 (ZU+ and Versal)

Linux Power Management

Linux has built-in support for runtime PM and Xilinx provides the required drivers to make this work on Zynq UltraScale+ devices. Refer to this page for a detailed tutorial on Linux PM: Zynq UltraScale+ MPSoC Power Management - Linux Kernel.