Greybus Firmware Download Class driver

modulename: gb-firmware.ko

configname: CONFIG_GREYBUS_FIRMWARE

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>Greybus support
└─>SPI support
└─>Greybus Firmware Download Class driver
In linux kernel since version 4.1 (release Date: 2015-06-21)  
Select this option if you have a device that follows the
Greybus Firmware Download Class specification.

To compile this code as a module, chose M here: the module
will be called gb-firmware.ko

source code:
drivers/staging/greybus/