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";
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