0001 * Renesas "Type-AXI" NBPFAXI* DMA controllers
0002
0003 * DMA controller
0004
0005 Required properties
0006
0007 - compatible: must be one of
0008 "renesas,nbpfaxi64dmac1b4"
0009 "renesas,nbpfaxi64dmac1b8"
0010 "renesas,nbpfaxi64dmac1b16"
0011 "renesas,nbpfaxi64dmac4b4"
0012 "renesas,nbpfaxi64dmac4b8"
0013 "renesas,nbpfaxi64dmac4b16"
0014 "renesas,nbpfaxi64dmac8b4"
0015 "renesas,nbpfaxi64dmac8b8"
0016 "renesas,nbpfaxi64dmac8b16"
0017 - #dma-cells: must be 2: the first integer is a terminal number, to which this
0018 slave is connected, the second one is flags. Flags is a bitmask
0019 with the following bits defined:
0020
0021 #define NBPF_SLAVE_RQ_HIGH 1
0022 #define NBPF_SLAVE_RQ_LOW 2
0023 #define NBPF_SLAVE_RQ_LEVEL 4
0024
0025 Optional properties:
0026 - max-burst-mem-read: limit burst size for memory reads
0027 (DMA_MEM_TO_MEM/DMA_MEM_TO_DEV) to this value, specified in bytes, rather
0028 than using the maximum burst size allowed by the hardware's buffer size.
0029 - max-burst-mem-write: limit burst size for memory writes
0030 (DMA_DEV_TO_MEM/DMA_MEM_TO_MEM) to this value, specified in bytes, rather
0031 than using the maximum burst size allowed by the hardware's buffer size.
0032 If both max-burst-mem-read and max-burst-mem-write are set, DMA_MEM_TO_MEM
0033 will use the lower value.
0034
0035 You can use dma-channels and dma-requests as described in dma.txt, although they
0036 won't be used, this information is derived from the compatibility string.
0037
0038 Example:
0039
0040 dma: dma-controller@48000000 {
0041 compatible = "renesas,nbpfaxi64dmac8b4";
0042 reg = <0x48000000 0x400>;
0043 interrupts = <0 12 0x4
0044 0 13 0x4
0045 0 14 0x4
0046 0 15 0x4
0047 0 16 0x4
0048 0 17 0x4
0049 0 18 0x4
0050 0 19 0x4>;
0051 #dma-cells = <2>;
0052 dma-channels = <8>;
0053 dma-requests = <8>;
0054 };
0055
0056 * DMA client
0057
0058 Required properties:
0059
0060 dmas and dma-names are required, as described in dma.txt.
0061
0062 Example:
0063
0064 #include <dt-bindings/dma/nbpfaxi.h>
0065
0066 ...
0067 dmas = <&dma 0 (NBPF_SLAVE_RQ_HIGH | NBPF_SLAVE_RQ_LEVEL)
0068 &dma 1 (NBPF_SLAVE_RQ_HIGH | NBPF_SLAVE_RQ_LEVEL)>;
0069 dma-names = "rx", "tx";
