Commit | Line | Data |
---|---|---|
290ad0f9 MP |
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 | |
9ca18397 | 37 | specifying the request line. |
290ad0f9 MP |
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 | }; |