CONFIG_GENERIC_PINMUX_FUNCTIONS (not configurable)

configname: CONFIG_GENERIC_PINMUX_FUNCTIONS

Linux Kernel Configuration
└─>Device Drivers
└─>Pin controllers
└─>GENERIC_PINMUX_FUNCTIONS
In linux kernel since version 3.10 (release Date: 2013-06-30)  
selects
CONFIG_PINMUX

depends
CONFIG_PINCTRL