Documentation/devicetree/bindings/dma/nbpfaxi.txt

   1 * Renesas "Type-AXI" NBPFAXI* DMA controllers
   2
   3 * DMA controller
   4
   5 Required properties
   6
   7 - compatible:   must be one of
   8                 "renesas,nbpfaxi64dmac1b4"
   9                 "renesas,nbpfaxi64dmac1b8"
  10                 "renesas,nbpfaxi64dmac1b16"
  11                 "renesas,nbpfaxi64dmac4b4"
  12                 "renesas,nbpfaxi64dmac4b8"
  13                 "renesas,nbpfaxi64dmac4b16"
  14                 "renesas,nbpfaxi64dmac8b4"
  15                 "renesas,nbpfaxi64dmac8b8"
  16                 "renesas,nbpfaxi64dmac8b16"
  17 - #dma-cells:   must be 2: the first integer is a terminal number, to which this
  18                 slave is connected, the second one is flags. Flags is a bitmask
  19                 with the following bits defined:
  20
  21 #define NBPF_SLAVE_RQ_HIGH      1
  22 #define NBPF_SLAVE_RQ_LOW       2
  23 #define NBPF_SLAVE_RQ_LEVEL     4
  24
  25 Optional properties:
  26 - max-burst-mem-read:   limit burst size for memory reads
  27   (DMA_MEM_TO_MEM/DMA_MEM_TO_DEV) to this value, specified in bytes, rather
  28   than using the maximum burst size allowed by the hardware's buffer size.
  29 - max-burst-mem-write:  limit burst size for memory writes
  30   (DMA_DEV_TO_MEM/DMA_MEM_TO_MEM) to this value, specified in bytes, rather
  31   than using the maximum burst size allowed by the hardware's buffer size.
  32   If both max-burst-mem-read and max-burst-mem-write are set, DMA_MEM_TO_MEM
  33   will use the lower value.
  34
  35 You can use dma-channels and dma-requests as described in dma.txt, although they
  36 won't be used, this information is derived from the compatibility string.
  37
  38 Example:
  39
  40         dma: dma-controller@48000000 {
  41                 compatible = "renesas,nbpfaxi64dmac8b4";
  42                 reg = <0x48000000 0x400>;
  43                 interrupts = <0 12 0x4
  44                               0 13 0x4
  45                               0 14 0x4
  46                               0 15 0x4
  47                               0 16 0x4
  48                               0 17 0x4
  49                               0 18 0x4
  50                               0 19 0x4>;
  51                 #dma-cells = <2>;
  52                 dma-channels = <8>;
  53                 dma-requests = <8>;
  54         };
  55
  56 * DMA client
  57
  58 Required properties:
  59
  60 dmas and dma-names are required, as described in dma.txt.
  61
  62 Example:
  63
  64 #include <dt-bindings/dma/nbpfaxi.h>
  65
  66 ...
  67                 dmas = <&dma 0 (NBPF_SLAVE_RQ_HIGH | NBPF_SLAVE_RQ_LEVEL)
  68                         &dma 1 (NBPF_SLAVE_RQ_HIGH | NBPF_SLAVE_RQ_LEVEL)>;
  69                 dma-names = "rx", "tx";