1Allwinner A31 DMA Controller 2 3This driver follows the generic DMA bindings defined in dma.txt. 4 5Required properties: 6 7- compatible: Must be one of 8 "allwinner,sun6i-a31-dma" 9 "allwinner,sun8i-a23-dma" 10 "allwinner,sun8i-h3-dma" 11- reg: Should contain the registers base address and length 12- interrupts: Should contain a reference to the interrupt used by this device 13- clocks: Should contain a reference to the parent AHB clock 14- resets: Should contain a reference to the reset controller asserting 15 this device in reset 16- #dma-cells : Should be 1, a single cell holding a line request number 17 18Example: 19 dma: dma-controller@01c02000 { 20 compatible = "allwinner,sun6i-a31-dma"; 21 reg = <0x01c02000 0x1000>; 22 interrupts = <0 50 4>; 23 clocks = <&ahb1_gates 6>; 24 resets = <&ahb1_rst 6>; 25 #dma-cells = <1>; 26 }; 27 28Clients: 29 30DMA clients connected to the A31 DMA controller must use the format 31described in the dma.txt file, using a two-cell specifier for each 32channel: a phandle plus one integer cells. 33The two cells in order are: 34 351. A phandle pointing to the DMA controller. 362. The port ID as specified in the datasheet 37 38Example: 39spi2: spi@01c6a000 { 40 compatible = "allwinner,sun6i-a31-spi"; 41 reg = <0x01c6a000 0x1000>; 42 interrupts = <0 67 4>; 43 clocks = <&ahb1_gates 22>, <&spi2_clk>; 44 clock-names = "ahb", "mod"; 45 dmas = <&dma 25>, <&dma 25>; 46 dma-names = "rx", "tx"; 47 resets = <&ahb1_rst 22>; 48}; 49