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Documentation / devicetree / bindings / dma / fsl-imx-dma.txt




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Based on kernel version 3.15.4. Page generated on 2014-07-07 09:00 EST.

1	* Freescale Direct Memory Access (DMA) Controller for i.MX
2	
3	This document will only describe differences to the generic DMA Controller and
4	DMA request bindings as described in dma/dma.txt .
5	
6	* DMA controller
7	
8	Required 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	
15	Optional properties:
16	- #dma-channels : Number of DMA channels supported. Should be 16.
17	- #dma-requests : Number of DMA requests supported.
18	
19	Example:
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	
32	Clients have to specify the DMA requests with phandles in a list.
33	
34	Required 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	
41	Example:
42	
43		sdhci1: sdhci@10013000 {
44			...
45			dmas = <&dma 7>;
46			dma-names = "rx-tx";
47			...
48		};
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