projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 10f5c843 LP |
1 | * Renesas R-Car DMA Controller Device Tree bindings |
| 2 | ||
| ac3e8ea1 | 3 | Renesas R-Car Generation 2 SoCs have multiple multi-channel DMA |
| 10f5c843 LP |
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 | DMA clients are connected to the DMAC ports referenced by an 8-bit identifier | |
| 9 | called MID/RID. | |
| 10 | ||
| 11 | Each DMA client is connected to one dedicated port of the DMAC, identified by | |
| 12 | an 8-bit port number called the MID/RID. A DMA controller can thus serve up to | |
| 13 | 256 clients in total. When the number of hardware channels is lower than the | |
| 14 | number of clients to be served, channels must be shared between multiple DMA | |
| 15 | clients. The association of DMA clients to DMAC channels is fully dynamic and | |
| 16 | not described in these device tree bindings. | |
| 17 | ||
| 18 | Required Properties: | |
| 19 | ||
| 20 | - compatible: must contain "renesas,rcar-dmac" | |
| 21 | ||
| 22 | - reg: base address and length of the registers block for the DMAC | |
| 23 | ||
| 24 | - interrupts: interrupt specifiers for the DMAC, one for each entry in | |
| 25 | interrupt-names. | |
| 26 | - interrupt-names: one entry per channel, named "ch%u", where %u is the | |
| 27 | channel number ranging from zero to the number of channels minus one. | |
| 28 | ||
| 29 | - clock-names: "fck" for the functional clock | |
| 30 | - clocks: a list of phandle + clock-specifier pairs, one for each entry | |
| 31 | in clock-names. | |
| 32 | - clock-names: must contain "fck" for the functional clock. | |
| 33 | ||
| 34 | - #dma-cells: must be <1>, the cell specifies the MID/RID of the DMAC port | |
| 35 | connected to the DMA client | |
| 36 | - dma-channels: number of DMA channels | |
| 37 | ||
| 38 | Example: R8A7790 (R-Car H2) SYS-DMACs | |
| 39 | ||
| 40 | dmac0: dma-controller@e6700000 { | |
| 41 | compatible = "renesas,rcar-dmac"; | |
| 42 | reg = <0 0xe6700000 0 0x20000>; | |
| 43 | interrupts = <0 197 IRQ_TYPE_LEVEL_HIGH | |
| 44 | 0 200 IRQ_TYPE_LEVEL_HIGH | |
| 45 | 0 201 IRQ_TYPE_LEVEL_HIGH | |
| 46 | 0 202 IRQ_TYPE_LEVEL_HIGH | |
| 47 | 0 203 IRQ_TYPE_LEVEL_HIGH | |
| 48 | 0 204 IRQ_TYPE_LEVEL_HIGH | |
| 49 | 0 205 IRQ_TYPE_LEVEL_HIGH | |
| 50 | 0 206 IRQ_TYPE_LEVEL_HIGH | |
| 51 | 0 207 IRQ_TYPE_LEVEL_HIGH | |
| 52 | 0 208 IRQ_TYPE_LEVEL_HIGH | |
| 53 | 0 209 IRQ_TYPE_LEVEL_HIGH | |
| 54 | 0 210 IRQ_TYPE_LEVEL_HIGH | |
| 55 | 0 211 IRQ_TYPE_LEVEL_HIGH | |
| 56 | 0 212 IRQ_TYPE_LEVEL_HIGH | |
| 57 | 0 213 IRQ_TYPE_LEVEL_HIGH | |
| 58 | 0 214 IRQ_TYPE_LEVEL_HIGH>; | |
| 59 | interrupt-names = "error", | |
| 60 | "ch0", "ch1", "ch2", "ch3", | |
| 61 | "ch4", "ch5", "ch6", "ch7", | |
| 62 | "ch8", "ch9", "ch10", "ch11", | |
| 63 | "ch12", "ch13", "ch14"; | |
| 64 | clocks = <&mstp2_clks R8A7790_CLK_SYS_DMAC0>; | |
| 65 | clock-names = "fck"; | |
| 66 | #dma-cells = <1>; | |
| 67 | dma-channels = <15>; | |
| 68 | }; | |
| 69 | ||
| 70 | dmac1: dma-controller@e6720000 { | |
| 71 | compatible = "renesas,rcar-dmac"; | |
| 72 | reg = <0 0xe6720000 0 0x20000>; | |
| 73 | interrupts = <0 220 IRQ_TYPE_LEVEL_HIGH | |
| 74 | 0 216 IRQ_TYPE_LEVEL_HIGH | |
| 75 | 0 217 IRQ_TYPE_LEVEL_HIGH | |
| 76 | 0 218 IRQ_TYPE_LEVEL_HIGH | |
| 77 | 0 219 IRQ_TYPE_LEVEL_HIGH | |
| 78 | 0 308 IRQ_TYPE_LEVEL_HIGH | |
| 79 | 0 309 IRQ_TYPE_LEVEL_HIGH | |
| 80 | 0 310 IRQ_TYPE_LEVEL_HIGH | |
| 81 | 0 311 IRQ_TYPE_LEVEL_HIGH | |
| 82 | 0 312 IRQ_TYPE_LEVEL_HIGH | |
| 83 | 0 313 IRQ_TYPE_LEVEL_HIGH | |
| 84 | 0 314 IRQ_TYPE_LEVEL_HIGH | |
| 85 | 0 315 IRQ_TYPE_LEVEL_HIGH | |
| 86 | 0 316 IRQ_TYPE_LEVEL_HIGH | |
| 87 | 0 317 IRQ_TYPE_LEVEL_HIGH | |
| 88 | 0 318 IRQ_TYPE_LEVEL_HIGH>; | |
| 89 | interrupt-names = "error", | |
| 90 | "ch0", "ch1", "ch2", "ch3", | |
| 91 | "ch4", "ch5", "ch6", "ch7", | |
| 92 | "ch8", "ch9", "ch10", "ch11", | |
| 93 | "ch12", "ch13", "ch14"; | |
| 94 | clocks = <&mstp2_clks R8A7790_CLK_SYS_DMAC1>; | |
| 95 | clock-names = "fck"; | |
| 96 | #dma-cells = <1>; | |
| 97 | dma-channels = <15>; | |
| 98 | }; |