CPU Idle Driver for Qualcomm Subsystem Power Manager (SPM)

modulename: cpuidle-qcom-spm.ko

configname: CONFIG_ARM_QCOM_SPM_CPUIDLE

Linux Kernel Configuration
└─>Power management and ACPI options
└─>CPU Idle
└─>ARM CPU Idle Drivers
└─>CPU Idle Driver for Qualcomm Subsystem Power Manager (SPM)
In linux kernel since version 5.1 (release Date: 2019-05-05)  
Select this to enable cpuidle for Qualcomm processors.
The Subsystem Power Manager (SPM) controls low power modes for the
CPU and L2 cores. It interface with various system drivers to put
the cores in low power modes.

source code:
drivers/cpuidle/cpuidle-qcom-spm.c