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

     * Actions Semi Owl SoCs DMA controller
     
     This binding follows the generic DMA bindings defined in dma.txt.
     
     Required properties:
     - compatible: Should be "actions,s900-dma".
     - reg: Should contain DMA registers location and length.
     - interrupts: Should contain 4 interrupts shared by all channel.
     - #dma-cells: Must be <1>. Used to represent the number of integer
                  cells in the dmas property of client device.
    - dma-channels: Physical channels supported.
    - dma-requests: Number of DMA request signals supported by the controller.
                    Refer to Documentation/devicetree/bindings/dma/dma.txt
    - clocks: Phandle and Specifier of the clock feeding the DMA controller.
    
    Example:
    
    Controller:
                    dma: dma-controller@e0260000 {
                            compatible = "actions,s900-dma";
                            reg = <0x0 0xe0260000 0x0 0x1000>;
                            interrupts = <GIC_SPI 57 IRQ_TYPE_LEVEL_HIGH>,
                                         <GIC_SPI 58 IRQ_TYPE_LEVEL_HIGH>,
                                         <GIC_SPI 59 IRQ_TYPE_LEVEL_HIGH>,
                                         <GIC_SPI 60 IRQ_TYPE_LEVEL_HIGH>;
                            #dma-cells = <1>;
                            dma-channels = <12>;
                            dma-requests = <46>;
                            clocks = <&clock CLK_DMAC>;
                    };
    
    Client:
    
    DMA clients connected to the Actions Semi Owl SoCs DMA controller must
    use the format described in the dma.txt file, using a two-cell specifier
    for each channel.
    
    The two cells in order are:
    1. A phandle pointing to the DMA controller.
    2. The channel id.
    
    uart5: serial@e012a000 {
            ...
            dma-names = "tx", "rx";
            dmas = <&dma 26>, <&dma 27>;
            ...
    };

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