The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/dma/fsl-imx-dma.txt

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    1 * Freescale Direct Memory Access (DMA) Controller for i.MX
    2 
    3 This document will only describe differences to the generic DMA Controller and
    4 DMA request bindings as described in dma/dma.txt .
    5 
    6 * DMA controller
    7 
    8 Required 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 
   15 Optional 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 
   21 Example:
   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 
   34 Clients have to specify the DMA requests with phandles in a list.
   35 
   36 Required 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 
   43 Example:
   44 
   45         sdhci1: sdhci@10013000 {
   46                 ...
   47                 dmas = <&dma 7>;
   48                 dma-names = "rx-tx";
   49                 ...
   50         };

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