* Freescale MXS DMA

Required properties:
- compatible : Should be "fsl,<chip>-dma-apbh" or "fsl,<chip>-dma-apbx"
- reg : Should contain registers location and length
- interrupts : Should contain the interrupt numbers of DMA channels.
  If a channel is empty/reserved, 0 should be filled in place.
- #dma-cells : Must be <1>.  The number cell specifies the channel ID.
- dma-channels : Number of channels supported by the DMA controller

Optional properties:
- interrupt-names : Name of DMA channel interrupts

Supported chips:
imx23, imx28.

Examples:

dma_apbh: dma-apbh@80004000 {
	compatible = "fsl,imx28-dma-apbh";
	reg = <0x80004000 0x2000>;
	interrupts = <82 83 84 85
		      88 88 88 88
		      88 88 88 88
		      87 86 0 0>;
	interrupt-names = "ssp0", "ssp1", "ssp2", "ssp3",
			  "gpmi0", "gmpi1", "gpmi2", "gmpi3",
			  "gpmi4", "gmpi5", "gpmi6", "gmpi7",
			  "hsadc", "lcdif", "empty", "empty";
	#dma-cells = <1>;
	dma-channels = <16>;
};

dma_apbx: dma-apbx@80024000 {
	compatible = "fsl,imx28-dma-apbx";
	reg = <0x80024000 0x2000>;
	interrupts = <78 79 66 0
		      80 81 68 69
		      70 71 72 73
		      74 75 76 77>;
	interrupt-names = "auart4-rx", "aurat4-tx", "spdif-tx", "empty",
			  "saif0", "saif1", "i2c0", "i2c1",
			  "auart0-rx", "auart0-tx", "auart1-rx", "auart1-tx",
			  "auart2-rx", "auart2-tx", "auart3-rx", "auart3-tx";
	#dma-cells = <1>;
	dma-channels = <16>;
};

DMA clients connected to the MXS DMA controller must use the format
described in the dma.txt file.

Examples:

auart0: serial@8006a000 {
	compatible = "fsl,imx28-auart", "fsl,imx23-auart";
	reg = <0x8006a000 0x2000>;
	interrupts = <112>;
	dmas = <&dma_apbx 8>, <&dma_apbx 9>;
	dma-names = "rx", "tx";
};