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* Atmel Extensible Direct Memory Access Controller (XDMAC)

* XDMA Controller
Required properties:
- compatible: Should be "atmel,<chip>-dma".
  <chip> compatible description:
  - sama5d4: first SoC adding the XDMAC
- reg: Should contain DMA registers location and length.
- interrupts: Should contain DMA interrupt.
- #dma-cells: Must be <1>, used to represent the number of integer cells in
the dmas property of client devices.
  - The 1st cell specifies the channel configuration register:
    - bit 13: SIF, source interface identifier, used to get the memory
    interface identifier,
    - bit 14: DIF, destination interface identifier, used to get the peripheral
    interface identifier,
    - bit 30-24: PERID, peripheral identifier.

Example:

dma1: dma-controller@f0004000 {
	compatible = "atmel,sama5d4-dma";
	reg = <0xf0004000 0x200>;
	interrupts = <50 4 0>;
	#dma-cells = <1>;
};


* DMA clients
DMA clients connected to the Atmel XDMA controller must use the format
described in the dma.txt file, using a one-cell specifier for each channel.
The two cells in order are:
1. A phandle pointing to the DMA controller.
2. Channel configuration register. Configurable fields are:
    - bit 13: SIF, source interface identifier, used to get the memory
    interface identifier,
    - bit 14: DIF, destination interface identifier, used to get the peripheral
    interface identifier,
  - bit 30-24: PERID, peripheral identifier.

Example:

i2c2: i2c@f8024000 {
	compatible = "atmel,at91sam9x5-i2c";
	reg = <0xf8024000 0x4000>;
	interrupts = <34 4 6>;
	dmas = <&dma1
		(AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1)
		 | AT91_XDMAC_DT_PERID(6))>,
	       <&dma1
		(AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1)
		| AT91_XDMAC_DT_PERID(7))>;
	dma-names = "tx", "rx";
};