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1* Atmel Direct Memory Access Controller (DMA)2 3Required properties:4- compatible: Should be "atmel,<chip>-dma".5- reg: Should contain DMA registers location and length.6- interrupts: Should contain DMA interrupt.7- #dma-cells: Must be <2>, used to represent the number of integer cells in8the dmas property of client devices.9 10Example:11 12dma0: dma@ffffec00 {13 compatible = "atmel,at91sam9g45-dma";14 reg = <0xffffec00 0x200>;15 interrupts = <21>;16 #dma-cells = <2>;17};18 19DMA clients connected to the Atmel DMA controller must use the format20described in the dma.txt file, using a three-cell specifier for each channel:21a phandle plus two integer cells.22The three cells in order are:23 241. A phandle pointing to the DMA controller.252. The memory interface (16 most significant bits), the peripheral interface26(16 less significant bits).273. Parameters for the at91 DMA configuration register which are device28dependent:29 - bit 7-0: peripheral identifier for the hardware handshaking interface. The30 identifier can be different for tx and rx.31 - bit 11-8: FIFO configuration. 0 for half FIFO, 1 for ALAP, 2 for ASAP.32 33Example:34 35i2c0@i2c@f8010000 {36 compatible = "atmel,at91sam9x5-i2c";37 reg = <0xf8010000 0x100>;38 interrupts = <9 4 6>;39 dmas = <&dma0 1 7>,40 <&dma0 1 8>;41 dma-names = "tx", "rx";42};43