Documentation/devicetree/bindings/dma/renesas,rcar-dmac.txt

   1 * Renesas R-Car (RZ/G) DMA Controller Device Tree bindings
   2
   3 Renesas R-Car Generation 2 SoCs have multiple multi-channel DMA
   4 controller instances named DMAC capable of serving multiple clients. Channels
   5 can be dedicated to specific clients or shared between a large number of
   6 clients.
   7
   8 Each DMA client is connected to one dedicated port of the DMAC, identified by
   9 an 8-bit port number called the MID/RID. A DMA controller can thus serve up to
  10 256 clients in total. When the number of hardware channels is lower than the
  11 number of clients to be served, channels must be shared between multiple DMA
  12 clients. The association of DMA clients to DMAC channels is fully dynamic and
  13 not described in these device tree bindings.
  14
  15 Required Properties:
  16
  17 - compatible: "renesas,dmac-<soctype>", "renesas,rcar-dmac" as fallback.
  18               Examples with soctypes are:
  19                 - "renesas,dmac-r8a7743" (RZ/G1M)
  20                 - "renesas,dmac-r8a7745" (RZ/G1E)
  21                 - "renesas,dmac-r8a77470" (RZ/G1C)
  22                 - "renesas,dmac-r8a7790" (R-Car H2)
  23                 - "renesas,dmac-r8a7791" (R-Car M2-W)
  24                 - "renesas,dmac-r8a7792" (R-Car V2H)
  25                 - "renesas,dmac-r8a7793" (R-Car M2-N)
  26                 - "renesas,dmac-r8a7794" (R-Car E2)
  27                 - "renesas,dmac-r8a7795" (R-Car H3)
  28                 - "renesas,dmac-r8a7796" (R-Car M3-W)
  29                 - "renesas,dmac-r8a77970" (R-Car V3M)
  30                 - "renesas,dmac-r8a77980" (R-Car V3H)
  31
  32 - reg: base address and length of the registers block for the DMAC
  33
  34 - interrupts: interrupt specifiers for the DMAC, one for each entry in
  35   interrupt-names.
  36 - interrupt-names: one entry for the error interrupt, named "error", plus one
  37   entry per channel, named "ch%u", where %u is the channel number ranging from
  38   zero to the number of channels minus one.
  39
  40 - clock-names: "fck" for the functional clock
  41 - clocks: a list of phandle + clock-specifier pairs, one for each entry
  42   in clock-names.
  43 - clock-names: must contain "fck" for the functional clock.
  44
  45 - #dma-cells: must be <1>, the cell specifies the MID/RID of the DMAC port
  46   connected to the DMA client
  47 - dma-channels: number of DMA channels
  48
  49 Example: R8A7790 (R-Car H2) SYS-DMACs
  50
  51         dmac0: dma-controller@e6700000 {
  52                 compatible = "renesas,dmac-r8a7790", "renesas,rcar-dmac";
  53                 reg = <0 0xe6700000 0 0x20000>;
  54                 interrupts = <0 197 IRQ_TYPE_LEVEL_HIGH
  55                               0 200 IRQ_TYPE_LEVEL_HIGH
  56                               0 201 IRQ_TYPE_LEVEL_HIGH
  57                               0 202 IRQ_TYPE_LEVEL_HIGH
  58                               0 203 IRQ_TYPE_LEVEL_HIGH
  59                               0 204 IRQ_TYPE_LEVEL_HIGH
  60                               0 205 IRQ_TYPE_LEVEL_HIGH
  61                               0 206 IRQ_TYPE_LEVEL_HIGH
  62                               0 207 IRQ_TYPE_LEVEL_HIGH
  63                               0 208 IRQ_TYPE_LEVEL_HIGH
  64                               0 209 IRQ_TYPE_LEVEL_HIGH
  65                               0 210 IRQ_TYPE_LEVEL_HIGH
  66                               0 211 IRQ_TYPE_LEVEL_HIGH
  67                               0 212 IRQ_TYPE_LEVEL_HIGH
  68                               0 213 IRQ_TYPE_LEVEL_HIGH
  69                               0 214 IRQ_TYPE_LEVEL_HIGH>;
  70                 interrupt-names = "error",
  71                                 "ch0", "ch1", "ch2", "ch3",
  72                                 "ch4", "ch5", "ch6", "ch7",
  73                                 "ch8", "ch9", "ch10", "ch11",
  74                                 "ch12", "ch13", "ch14";
  75                 clocks = <&mstp2_clks R8A7790_CLK_SYS_DMAC0>;
  76                 clock-names = "fck";
  77                 #dma-cells = <1>;
  78                 dma-channels = <15>;
  79         };
  80
  81         dmac1: dma-controller@e6720000 {
  82                 compatible = "renesas,dmac-r8a7790", "renesas,rcar-dmac";
  83                 reg = <0 0xe6720000 0 0x20000>;
  84                 interrupts = <0 220 IRQ_TYPE_LEVEL_HIGH
  85                               0 216 IRQ_TYPE_LEVEL_HIGH
  86                               0 217 IRQ_TYPE_LEVEL_HIGH
  87                               0 218 IRQ_TYPE_LEVEL_HIGH
  88                               0 219 IRQ_TYPE_LEVEL_HIGH
  89                               0 308 IRQ_TYPE_LEVEL_HIGH
  90                               0 309 IRQ_TYPE_LEVEL_HIGH
  91                               0 310 IRQ_TYPE_LEVEL_HIGH
  92                               0 311 IRQ_TYPE_LEVEL_HIGH
  93                               0 312 IRQ_TYPE_LEVEL_HIGH
  94                               0 313 IRQ_TYPE_LEVEL_HIGH
  95                               0 314 IRQ_TYPE_LEVEL_HIGH
  96                               0 315 IRQ_TYPE_LEVEL_HIGH
  97                               0 316 IRQ_TYPE_LEVEL_HIGH
  98                               0 317 IRQ_TYPE_LEVEL_HIGH
  99                               0 318 IRQ_TYPE_LEVEL_HIGH>;
 100                 interrupt-names = "error",
 101                                 "ch0", "ch1", "ch2", "ch3",
 102                                 "ch4", "ch5", "ch6", "ch7",
 103                                 "ch8", "ch9", "ch10", "ch11",
 104                                 "ch12", "ch13", "ch14";
 105                 clocks = <&mstp2_clks R8A7790_CLK_SYS_DMAC1>;
 106                 clock-names = "fck";
 107                 #dma-cells = <1>;
 108                 dma-channels = <15>;
 109         };