| * Freescale Direct Memory Access (DMA) Controller for i.MX |
| |
| This document will only describe differences to the generic DMA Controller and |
| DMA request bindings as described in dma/dma.txt . |
| |
| * DMA controller |
| |
| Required properties: |
| - compatible : Should be "fsl,<chip>-dma". chip can be imx1, imx21 or imx27 |
| - reg : Should contain DMA registers location and length |
| - interrupts : First item should be DMA interrupt, second one is optional and |
| should contain DMA Error interrupt |
| - #dma-cells : Has to be 1. imx-dma does not support anything else. |
| |
| Optional properties: |
| - #dma-channels : Number of DMA channels supported. Should be 16. |
| - #dma-requests : Number of DMA requests supported. |
| |
| Example: |
| |
| dma: dma@10001000 { |
| compatible = "fsl,imx27-dma"; |
| reg = <0x10001000 0x1000>; |
| interrupts = <32 33>; |
| #dma-cells = <1>; |
| #dma-channels = <16>; |
| }; |
| |
| |
| * DMA client |
| |
| Clients have to specify the DMA requests with phandles in a list. |
| |
| Required properties: |
| - dmas: List of one or more DMA request specifiers. One DMA request specifier |
| consists of a phandle to the DMA controller followed by the integer |
| specifiying the request line. |
| - dma-names: List of string identifiers for the DMA requests. For the correct |
| names, have a look at the specific client driver. |
| |
| Example: |
| |
| sdhci1: sdhci@10013000 { |
| ... |
| dmas = <&dma 7>; |
| dma-names = "rx-tx"; |
| ... |
| }; |