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-channels : deprecated 18- dma-requests : Number of DMA requests supported. 19- #dma-requests : deprecated 20 21Example: 22 23 dma: dma@10001000 { 24 compatible = "fsl,imx27-dma"; 25 reg = <0x10001000 0x1000>; 26 interrupts = <32 33>; 27 #dma-cells = <1>; 28 dma-channels = <16>; 29 }; 30 31 32* DMA client 33 34Clients have to specify the DMA requests with phandles in a list. 35 36Required properties: 37- dmas: List of one or more DMA request specifiers. One DMA request specifier 38 consists of a phandle to the DMA controller followed by the integer 39 specifying the request line. 40- dma-names: List of string identifiers for the DMA requests. For the correct 41 names, have a look at the specific client driver. 42 43Example: 44 45 sdhci1: sdhci@10013000 { 46 ... 47 dmas = <&dma 7>; 48 dma-names = "rx-tx"; 49 ... 50 }; 51