CONFIG_DMA_OF (not configurable)

modulename: of-dma.ko

configname: CONFIG_DMA_OF

Linux Kernel Configuration
└─>Device Drivers
└─>DMA Engine support
└─>DMA_OF
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
drivers/dma/of-dma.c