PSCI CPU idle Driver

modulename: cpuidle-psci.ko

and/or

cpuidle_psci.ko

configname: CONFIG_ARM_PSCI_CPUIDLE

Linux Kernel Configuration
└─>Power management and ACPI options
└─>CPU Idle
└─>ARM CPU Idle Drivers
└─>PSCI CPU idle Driver
In linux kernel since version 5.1 (release Date: 2019-05-05)  
Select this to enable PSCI firmware based CPUidle driver for ARM.
It provides an idle driver that is capable of detecting and
managing idle states through the PSCI firmware interface.

source code:
drivers/cpuidle/