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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 | ||
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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: must contain "renesas,rcar-dmac" | |
18 | ||
19 | - reg: base address and length of the registers block for the DMAC | |
20 | ||
21 | - interrupts: interrupt specifiers for the DMAC, one for each entry in | |
22 | interrupt-names. | |
23 | - interrupt-names: one entry per channel, named "ch%u", where %u is the | |
24 | channel number ranging from zero to the number of channels minus one. | |
25 | ||
26 | - clock-names: "fck" for the functional clock | |
27 | - clocks: a list of phandle + clock-specifier pairs, one for each entry | |
28 | in clock-names. | |
29 | - clock-names: must contain "fck" for the functional clock. | |
30 | ||
31 | - #dma-cells: must be <1>, the cell specifies the MID/RID of the DMAC port | |
32 | connected to the DMA client | |
33 | - dma-channels: number of DMA channels | |
34 | ||
35 | Example: R8A7790 (R-Car H2) SYS-DMACs | |
36 | ||
37 | dmac0: dma-controller@e6700000 { | |
38 | compatible = "renesas,rcar-dmac"; | |
39 | reg = <0 0xe6700000 0 0x20000>; | |
40 | interrupts = <0 197 IRQ_TYPE_LEVEL_HIGH | |
41 | 0 200 IRQ_TYPE_LEVEL_HIGH | |
42 | 0 201 IRQ_TYPE_LEVEL_HIGH | |
43 | 0 202 IRQ_TYPE_LEVEL_HIGH | |
44 | 0 203 IRQ_TYPE_LEVEL_HIGH | |
45 | 0 204 IRQ_TYPE_LEVEL_HIGH | |
46 | 0 205 IRQ_TYPE_LEVEL_HIGH | |
47 | 0 206 IRQ_TYPE_LEVEL_HIGH | |
48 | 0 207 IRQ_TYPE_LEVEL_HIGH | |
49 | 0 208 IRQ_TYPE_LEVEL_HIGH | |
50 | 0 209 IRQ_TYPE_LEVEL_HIGH | |
51 | 0 210 IRQ_TYPE_LEVEL_HIGH | |
52 | 0 211 IRQ_TYPE_LEVEL_HIGH | |
53 | 0 212 IRQ_TYPE_LEVEL_HIGH | |
54 | 0 213 IRQ_TYPE_LEVEL_HIGH | |
55 | 0 214 IRQ_TYPE_LEVEL_HIGH>; | |
56 | interrupt-names = "error", | |
57 | "ch0", "ch1", "ch2", "ch3", | |
58 | "ch4", "ch5", "ch6", "ch7", | |
59 | "ch8", "ch9", "ch10", "ch11", | |
60 | "ch12", "ch13", "ch14"; | |
61 | clocks = <&mstp2_clks R8A7790_CLK_SYS_DMAC0>; | |
62 | clock-names = "fck"; | |
63 | #dma-cells = <1>; | |
64 | dma-channels = <15>; | |
65 | }; | |
66 | ||
67 | dmac1: dma-controller@e6720000 { | |
68 | compatible = "renesas,rcar-dmac"; | |
69 | reg = <0 0xe6720000 0 0x20000>; | |
70 | interrupts = <0 220 IRQ_TYPE_LEVEL_HIGH | |
71 | 0 216 IRQ_TYPE_LEVEL_HIGH | |
72 | 0 217 IRQ_TYPE_LEVEL_HIGH | |
73 | 0 218 IRQ_TYPE_LEVEL_HIGH | |
74 | 0 219 IRQ_TYPE_LEVEL_HIGH | |
75 | 0 308 IRQ_TYPE_LEVEL_HIGH | |
76 | 0 309 IRQ_TYPE_LEVEL_HIGH | |
77 | 0 310 IRQ_TYPE_LEVEL_HIGH | |
78 | 0 311 IRQ_TYPE_LEVEL_HIGH | |
79 | 0 312 IRQ_TYPE_LEVEL_HIGH | |
80 | 0 313 IRQ_TYPE_LEVEL_HIGH | |
81 | 0 314 IRQ_TYPE_LEVEL_HIGH | |
82 | 0 315 IRQ_TYPE_LEVEL_HIGH | |
83 | 0 316 IRQ_TYPE_LEVEL_HIGH | |
84 | 0 317 IRQ_TYPE_LEVEL_HIGH | |
85 | 0 318 IRQ_TYPE_LEVEL_HIGH>; | |
86 | interrupt-names = "error", | |
87 | "ch0", "ch1", "ch2", "ch3", | |
88 | "ch4", "ch5", "ch6", "ch7", | |
89 | "ch8", "ch9", "ch10", "ch11", | |
90 | "ch12", "ch13", "ch14"; | |
91 | clocks = <&mstp2_clks R8A7790_CLK_SYS_DMAC1>; | |
92 | clock-names = "fck"; | |
93 | #dma-cells = <1>; | |
94 | dma-channels = <15>; | |
95 | }; |