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Diffstat (limited to 'Documentation/devicetree/bindings/dma/arm-pl330.txt')
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diff --git a/Documentation/devicetree/bindings/dma/arm-pl330.txt b/Documentation/devicetree/bindings/dma/arm-pl330.txt new file mode 100644 index 000000000..315e90122 --- /dev/null +++ b/Documentation/devicetree/bindings/dma/arm-pl330.txt @@ -0,0 +1,49 @@ +* ARM PrimeCell PL330 DMA Controller + +The ARM PrimeCell PL330 DMA controller can move blocks of memory contents +between memory and peripherals or memory to memory. + +Required properties: + - compatible: should include both "arm,pl330" and "arm,primecell". + - reg: physical base address of the controller and length of memory mapped + region. + - interrupts: interrupt number to the cpu. + +Optional properties: + - dma-coherent : Present if dma operations are coherent + - #dma-cells: must be <1>. used to represent the number of integer + cells in the dmas property of client device. + - dma-channels: contains the total number of DMA channels supported by the DMAC + - dma-requests: contains the total number of DMA requests supported by the DMAC + - arm,pl330-broken-no-flushp: quirk for avoiding to execute DMAFLUSHP + - arm,pl330-periph-burst: quirk for performing burst transfer only + - resets: contains an entry for each entry in reset-names. + See ../reset/reset.txt for details. + - reset-names: must contain at least "dma", and optional is "dma-ocp". + +Example: + + pdma0: pdma@12680000 { + compatible = "arm,pl330", "arm,primecell"; + reg = <0x12680000 0x1000>; + interrupts = <99>; + #dma-cells = <1>; + #dma-channels = <8>; + #dma-requests = <32>; + }; + +Client drivers (device nodes requiring dma transfers from dev-to-mem or +mem-to-dev) should specify the DMA channel numbers and dma channel names +as shown below. + + [property name] = <[phandle of the dma controller] [dma request id]>; + [property name] = <[dma channel name]> + + where 'dma request id' is the dma request number which is connected + to the client controller. The 'property name' 'dmas' and 'dma-names' + as required by the generic dma device tree binding helpers. The dma + names correspond 1:1 with the dma request ids in the dmas property. + + Example: dmas = <&pdma0 12 + &pdma1 11>; + dma-names = "tx", "rx"; |