AT91 PIO4 pinctrl driver

modulename: pinctrl-at91-pio4.ko

configname: CONFIG_PINCTRL_AT91PIO4

Linux Kernel Configuration
└─>Device Drivers
└─>Pin controllers
└─>Device Tree and Open Firmware support
└─>AT91 PIO4 pinctrl driver
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Say Y here to enable the at91 pinctrl/gpio driver for Atmel PIO4
controller available on sama5d2 SoC.

source code: