1* Freescale Direct Memory Access (DMA) Controller for i.MX
2
3This document will only describe differences to the generic DMA Controller and
4DMA request bindings as described in dma/dma.txt .
5
6* DMA controller
7
8Required properties:
9- compatible : Should be "fsl,<chip>-dma". chip can be imx1, imx21 or imx27
10- reg : Should contain DMA registers location and length
11- interrupts : First item should be DMA interrupt, second one is optional and
12    should contain DMA Error interrupt
13- #dma-cells : Has to be 1. imx-dma does not support anything else.
14
15Optional properties:
16- #dma-channels : Number of DMA channels supported. Should be 16.
17- #dma-requests : Number of DMA requests supported.
18
19Example:
20
21	dma: dma@10001000 {
22		compatible = "fsl,imx27-dma";
23		reg = <0x10001000 0x1000>;
24		interrupts = <32 33>;
25		#dma-cells = <1>;
26		#dma-channels = <16>;
27	};
28
29
30* DMA client
31
32Clients have to specify the DMA requests with phandles in a list.
33
34Required properties:
35- dmas: List of one or more DMA request specifiers. One DMA request specifier
36    consists of a phandle to the DMA controller followed by the integer
37    specifying the request line.
38- dma-names: List of string identifiers for the DMA requests. For the correct
39    names, have a look at the specific client driver.
40
41Example:
42
43	sdhci1: sdhci@10013000 {
44		...
45		dmas = <&dma 7>;
46		dma-names = "rx-tx";
47		...
48	};
49