Mediatek MT7621 GPIO Support

modulename: gpio-mt7621.ko

configname: CONFIG_GPIO_MT7621

Linux Kernel Configuration
└─>Device Drivers
└─>GPIO Support
└─>Memory mapped GPIO drivers
└─>Mediatek MT7621 GPIO Support
In linux kernel since version 4.2 (release Date: 2015-08-30)  
Say yes here to support the Mediatek MT7621 SoC GPIO device

source code:
drivers/gpio/gpio-mt7621.c