GPIO based on SYSCON

modulename: gpio-syscon.ko

configname: CONFIG_GPIO_SYSCON

Linux Kernel Configuration
└─>Device Drivers
└─>GPIO Support
└─>Memory mapped GPIO drivers
└─>Device Tree and Open Firmware support
└─>GPIO based on SYSCON
In linux kernel since version 3.15 (release Date: 2014-06-08)  
Say yes here to support GPIO functionality though SYSCON driver.

source code: