0001 * Freescale Direct Memory Access (DMA) Controller for i.MX
0002
0003 This document will only describe differences to the generic DMA Controller and
0004 DMA request bindings as described in dma/dma.txt .
0005
0006 * DMA controller
0007
0008 Required properties:
0009 - compatible : Should be "fsl,<chip>-dma". chip can be imx1, imx21 or imx27
0010 - reg : Should contain DMA registers location and length
0011 - interrupts : First item should be DMA interrupt, second one is optional and
0012 should contain DMA Error interrupt
0013 - #dma-cells : Has to be 1. imx-dma does not support anything else.
0014
0015 Optional properties:
0016 - dma-channels : Number of DMA channels supported. Should be 16.
0017 - #dma-channels : deprecated
0018 - dma-requests : Number of DMA requests supported.
0019 - #dma-requests : deprecated
0020
0021 Example:
0022
0023 dma: dma@10001000 {
0024 compatible = "fsl,imx27-dma";
0025 reg = <0x10001000 0x1000>;
0026 interrupts = <32 33>;
0027 #dma-cells = <1>;
0028 dma-channels = <16>;
0029 };
0030
0031
0032 * DMA client
0033
0034 Clients have to specify the DMA requests with phandles in a list.
0035
0036 Required properties:
0037 - dmas: List of one or more DMA request specifiers. One DMA request specifier
0038 consists of a phandle to the DMA controller followed by the integer
0039 specifying the request line.
0040 - dma-names: List of string identifiers for the DMA requests. For the correct
0041 names, have a look at the specific client driver.
0042
0043 Example:
0044
0045 sdhci1: sdhci@10013000 {
0046 ...
0047 dmas = <&dma 7>;
0048 dma-names = "rx-tx";
0049 ...
0050 };
