1290ad0f9SMarkus Pargmann* Freescale Direct Memory Access (DMA) Controller for i.MX 2290ad0f9SMarkus Pargmann 3290ad0f9SMarkus PargmannThis document will only describe differences to the generic DMA Controller and 4290ad0f9SMarkus PargmannDMA request bindings as described in dma/dma.txt . 5290ad0f9SMarkus Pargmann 6290ad0f9SMarkus Pargmann* DMA controller 7290ad0f9SMarkus Pargmann 8290ad0f9SMarkus PargmannRequired properties: 9290ad0f9SMarkus Pargmann- compatible : Should be "fsl,<chip>-dma". chip can be imx1, imx21 or imx27 10290ad0f9SMarkus Pargmann- reg : Should contain DMA registers location and length 11290ad0f9SMarkus Pargmann- interrupts : First item should be DMA interrupt, second one is optional and 12290ad0f9SMarkus Pargmann should contain DMA Error interrupt 13290ad0f9SMarkus Pargmann- #dma-cells : Has to be 1. imx-dma does not support anything else. 14290ad0f9SMarkus Pargmann 15290ad0f9SMarkus PargmannOptional properties: 16290ad0f9SMarkus Pargmann- #dma-channels : Number of DMA channels supported. Should be 16. 17290ad0f9SMarkus Pargmann- #dma-requests : Number of DMA requests supported. 18290ad0f9SMarkus Pargmann 19290ad0f9SMarkus PargmannExample: 20290ad0f9SMarkus Pargmann 21290ad0f9SMarkus Pargmann dma: dma@10001000 { 22290ad0f9SMarkus Pargmann compatible = "fsl,imx27-dma"; 23290ad0f9SMarkus Pargmann reg = <0x10001000 0x1000>; 24290ad0f9SMarkus Pargmann interrupts = <32 33>; 25290ad0f9SMarkus Pargmann #dma-cells = <1>; 26290ad0f9SMarkus Pargmann #dma-channels = <16>; 27290ad0f9SMarkus Pargmann }; 28290ad0f9SMarkus Pargmann 29290ad0f9SMarkus Pargmann 30290ad0f9SMarkus Pargmann* DMA client 31290ad0f9SMarkus Pargmann 32290ad0f9SMarkus PargmannClients have to specify the DMA requests with phandles in a list. 33290ad0f9SMarkus Pargmann 34290ad0f9SMarkus PargmannRequired properties: 35290ad0f9SMarkus Pargmann- dmas: List of one or more DMA request specifiers. One DMA request specifier 36290ad0f9SMarkus Pargmann consists of a phandle to the DMA controller followed by the integer 37290ad0f9SMarkus Pargmann specifiying the request line. 38290ad0f9SMarkus Pargmann- dma-names: List of string identifiers for the DMA requests. For the correct 39290ad0f9SMarkus Pargmann names, have a look at the specific client driver. 40290ad0f9SMarkus Pargmann 41290ad0f9SMarkus PargmannExample: 42290ad0f9SMarkus Pargmann 43290ad0f9SMarkus Pargmann sdhci1: sdhci@10013000 { 44290ad0f9SMarkus Pargmann ... 45290ad0f9SMarkus Pargmann dmas = <&dma 7>; 46290ad0f9SMarkus Pargmann dma-names = "rx-tx"; 47290ad0f9SMarkus Pargmann ... 48290ad0f9SMarkus Pargmann }; 49