Broadcom Northstar pins driver

modulename: pinctrl-ns.ko

configname: CONFIG_PINCTRL_NS

Linux Kernel Configuration
└─>Device Drivers
└─>Pin controllers
└─>Device Tree and Open Firmware support
└─>Broadcom Northstar pins driver
In linux kernel since version 4.2 (release Date: 2015-08-30)  
Say yes here to enable the Broadcom NS SoC pins driver.

The Broadcom Northstar pins driver supports muxing multi-purpose pins
that can be used for various functions (e.g. SPI, I2C, UART) as well
as GPIOs.

source code: