CONFIG_ARCH_HAVE_CUSTOM_GPIO_H (not configurable)

configname: CONFIG_ARCH_HAVE_CUSTOM_GPIO_H

Linux Kernel Configuration
└─>Device Drivers
└─>ARCH_HAVE_CUSTOM_GPIO_H
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Selecting this config option from the architecture Kconfig allows
the architecture to provide a custom asm/gpio.h implementation
overriding the default implementations. New uses of this are
strongly discouraged.