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