CONFIG_CPU_PM (not configurable)

modulename: pm.ko

and/or

sleep.ko

and/or

cpu_pm.ko

configname: CONFIG_CPU_PM

Linux Kernel Configuration
└─>Power management and ACPI options
└─>CPU_PM
In linux kernel since version 3.10 (release Date: 2013-06-30)  
source code:
arch/mips/kernel/pm.c