mmp-dma.txt

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    1 * MARVELL MMP DMA controller
    2 
    3 Marvell Peripheral DMA Controller
    4 Used platforms: pxa688, pxa910, pxa3xx, etc
    5 
    6 Required properties:
    7 - compatible: Should be "marvell,pdma-1.0"
    8 - reg: Should contain DMA registers location and length.
    9 - interrupts: Either contain all of the per-channel DMA interrupts
   10                 or one irq for pdma device
   11 
   12 Optional properties:
   13 - dma-channels: Number of DMA channels supported by the controller (defaults
   14   to 32 when not specified)
   15 - #dma-channels: deprecated
   16 - dma-requests: Number of DMA requestor lines supported by the controller
   17   (defaults to 32 when not specified)
   18 - #dma-requests: deprecated
   19 
   20 "marvell,pdma-1.0"
   21 Used platforms: pxa25x, pxa27x, pxa3xx, pxa93x, pxa168, pxa910, pxa688.
   22 
   23 Examples:
   24 
   25 /*
   26  * Each channel has specific irq
   27  * ICU parse out irq channel from ICU register,
   28  * while DMA controller may not able to distinguish the irq channel
   29  * Using this method, interrupt-parent is required as demuxer
   30  * For example, pxa688 icu register 0x128, bit 0~15 is PDMA channel irq,
   31  * 18~21 is ADMA irq
   32  */
   33 pdma: dma-controller@d4000000 {
   34               compatible = "marvell,pdma-1.0";
   35               reg = <0xd4000000 0x10000>;
   36               interrupts = <0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15>;
   37               interrupt-parent = <&intcmux32>;
   38               dma-channels = <16>;
   39       };
   40 
   41 /*
   42  * One irq for all channels
   43  * Dmaengine driver (DMA controller) distinguish irq channel via
   44  * parsing internal register
   45  */
   46 pdma: dma-controller@d4000000 {
   47               compatible = "marvell,pdma-1.0";
   48               reg = <0xd4000000 0x10000>;
   49               interrupts = <47>;
   50               dma-channels = <16>;
   51       };
   52 
   53 
   54 Marvell Two Channel DMA Controller used specifically for audio
   55 Used platforms: pxa688, pxa910
   56 
   57 Required properties:
   58 - compatible: Should be "marvell,adma-1.0" or "marvell,pxa910-squ"
   59 - reg: Should contain DMA registers location and length.
   60 - interrupts: Either contain all of the per-channel DMA interrupts
   61                 or one irq for dma device
   62 
   63 "marvell,adma-1.0" used on pxa688
   64 "marvell,pxa910-squ" used on pxa910
   65 
   66 Examples:
   67 
   68 /* each channel has specific irq */
   69 adma0: dma-controller@d42a0800 {
   70               compatible = "marvell,adma-1.0";
   71               reg = <0xd42a0800 0x100>;
   72               interrupts = <18 19>;
   73               interrupt-parent = <&intcmux32>;
   74       };
   75 
   76 /* One irq for all channels */
   77 squ: dma-controller@d42a0800 {
   78               compatible = "marvell,pxa910-squ";
   79               reg = <0xd42a0800 0x100>;
   80               interrupts = <46>;
   81       };

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sys/contrib/device-tree/Bindings/dma/mmp-dma.txt