Based on kernel version 4.16.1. Page generated on 2018-04-09 11:52 EST.
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";