Bindings/dma/mmp-dma.txt

   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       };