modulename: gpio-tps68470.ko

configname: CONFIG_GPIO_TPS68470

Linux Kernel Configuration
└─>Device Drivers
└─>GPIO Support
└─>MFD GPIO expanders
└─>TPS68470 GPIO
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Select this option to enable GPIO driver for the TPS68470
chip family.
There are 7 GPIOs and few sensor-related GPIOs supported
by the TPS68470. While the 7 GPIOs can be configured as
input or output as appropriate, the sensor related GPIOs
are "output only" GPIOs.

source code: