CONFIG_OF_OVERLAY (not configurable)

modulename: overlay.ko

and/or

overlay.dtb.ko

configname: CONFIG_OF_OVERLAY

Linux Kernel Configuration
└─>Device Drivers
└─>Device Tree and Open Firmware support
└─>OF_OVERLAY
In linux kernel since version 3.10 (release Date: 2013-06-30)
source code:
drivers/of/overlay.c

depends
CONFIG_OF

is depended by
CONFIG_DRM_RCAR_LVDS