Device Tree and Open Firmware support

modulename: devicetree.ko

and/or

of.ko

and/or

of_regulator.ko

and/or

of_memory.ko

and/or

prom.ko

and/or

devtree.ko

configname: CONFIG_OF

Linux Kernel Configuration
└─>Device Drivers
└─>Device Tree and Open Firmware support
In linux kernel since version 2.6.23 (release Date: 2007-10-09)  
This option enables the device tree infrastructure.
It is automatically selected by platforms that need it or can
be enabled manually for unittests, overlays or
compile-coverage.

source code:
drivers/pinctrl/devicetree.c