Generic SYSCON regmap poweroff driver

modulename: syscon-poweroff.ko

configname: CONFIG_POWER_RESET_SYSCON_POWEROFF

Linux Kernel Configuration
└─>Device Drivers
└─>Power supply class support
└─>Board level reset or power off
└─>Generic SYSCON regmap poweroff driver
In linux kernel since version 4.1 (release Date: 2015-06-21)  
Poweroff support for generic SYSCON mapped register poweroff.

source code: