1*14c2a7b9SSimon Horman* Renesas "Type-AXI" NBPFAXI* DMA controllers 2*14c2a7b9SSimon Horman 3*14c2a7b9SSimon Horman* DMA controller 4*14c2a7b9SSimon Horman 5*14c2a7b9SSimon HormanRequired properties 6*14c2a7b9SSimon Horman 7*14c2a7b9SSimon Horman- compatible: must be one of 8*14c2a7b9SSimon Horman "renesas,nbpfaxi64dmac1b4" 9*14c2a7b9SSimon Horman "renesas,nbpfaxi64dmac1b8" 10*14c2a7b9SSimon Horman "renesas,nbpfaxi64dmac1b16" 11*14c2a7b9SSimon Horman "renesas,nbpfaxi64dmac4b4" 12*14c2a7b9SSimon Horman "renesas,nbpfaxi64dmac4b8" 13*14c2a7b9SSimon Horman "renesas,nbpfaxi64dmac4b16" 14*14c2a7b9SSimon Horman "renesas,nbpfaxi64dmac8b4" 15*14c2a7b9SSimon Horman "renesas,nbpfaxi64dmac8b8" 16*14c2a7b9SSimon Horman "renesas,nbpfaxi64dmac8b16" 17*14c2a7b9SSimon Horman- #dma-cells: must be 2: the first integer is a terminal number, to which this 18*14c2a7b9SSimon Horman slave is connected, the second one is flags. Flags is a bitmask 19*14c2a7b9SSimon Horman with the following bits defined: 20*14c2a7b9SSimon Horman 21*14c2a7b9SSimon Horman#define NBPF_SLAVE_RQ_HIGH 1 22*14c2a7b9SSimon Horman#define NBPF_SLAVE_RQ_LOW 2 23*14c2a7b9SSimon Horman#define NBPF_SLAVE_RQ_LEVEL 4 24*14c2a7b9SSimon Horman 25*14c2a7b9SSimon HormanOptional properties: 26*14c2a7b9SSimon Horman- max-burst-mem-read: limit burst size for memory reads 27*14c2a7b9SSimon Horman (DMA_MEM_TO_MEM/DMA_MEM_TO_DEV) to this value, specified in bytes, rather 28*14c2a7b9SSimon Horman than using the maximum burst size allowed by the hardware's buffer size. 29*14c2a7b9SSimon Horman- max-burst-mem-write: limit burst size for memory writes 30*14c2a7b9SSimon Horman (DMA_DEV_TO_MEM/DMA_MEM_TO_MEM) to this value, specified in bytes, rather 31*14c2a7b9SSimon Horman than using the maximum burst size allowed by the hardware's buffer size. 32*14c2a7b9SSimon Horman If both max-burst-mem-read and max-burst-mem-write are set, DMA_MEM_TO_MEM 33*14c2a7b9SSimon Horman will use the lower value. 34*14c2a7b9SSimon Horman 35*14c2a7b9SSimon HormanYou can use dma-channels and dma-requests as described in dma.txt, although they 36*14c2a7b9SSimon Hormanwon't be used, this information is derived from the compatibility string. 37*14c2a7b9SSimon Horman 38*14c2a7b9SSimon HormanExample: 39*14c2a7b9SSimon Horman 40*14c2a7b9SSimon Horman dma: dma-controller@48000000 { 41*14c2a7b9SSimon Horman compatible = "renesas,nbpfaxi64dmac8b4"; 42*14c2a7b9SSimon Horman reg = <0x48000000 0x400>; 43*14c2a7b9SSimon Horman interrupts = <0 12 0x4 44*14c2a7b9SSimon Horman 0 13 0x4 45*14c2a7b9SSimon Horman 0 14 0x4 46*14c2a7b9SSimon Horman 0 15 0x4 47*14c2a7b9SSimon Horman 0 16 0x4 48*14c2a7b9SSimon Horman 0 17 0x4 49*14c2a7b9SSimon Horman 0 18 0x4 50*14c2a7b9SSimon Horman 0 19 0x4>; 51*14c2a7b9SSimon Horman #dma-cells = <2>; 52*14c2a7b9SSimon Horman dma-channels = <8>; 53*14c2a7b9SSimon Horman dma-requests = <8>; 54*14c2a7b9SSimon Horman }; 55*14c2a7b9SSimon Horman 56*14c2a7b9SSimon Horman* DMA client 57*14c2a7b9SSimon Horman 58*14c2a7b9SSimon HormanRequired properties: 59*14c2a7b9SSimon Horman 60*14c2a7b9SSimon Hormandmas and dma-names are required, as described in dma.txt. 61*14c2a7b9SSimon Horman 62*14c2a7b9SSimon HormanExample: 63*14c2a7b9SSimon Horman 64*14c2a7b9SSimon Horman#include <dt-bindings/dma/nbpfaxi.h> 65*14c2a7b9SSimon Horman 66*14c2a7b9SSimon Horman... 67*14c2a7b9SSimon Horman dmas = <&dma 0 (NBPF_SLAVE_RQ_HIGH | NBPF_SLAVE_RQ_LEVEL) 68*14c2a7b9SSimon Horman &dma 1 (NBPF_SLAVE_RQ_HIGH | NBPF_SLAVE_RQ_LEVEL)>; 69*14c2a7b9SSimon Horman dma-names = "rx", "tx"; 70