dmac4: dma@35540000 { compatible = "snps,axi-dma-1.01a"; reg = <0 0x35540000 0 0x10000>, //dma reg address <0 0x30470000 0 0x10000>; //dma mux address for mux mode #dma-cells = <1>; clocks = <&HIS_BUS_2>, <&HIS_BUS_2>;// clock-names = "core-clk", "cfgr-clk"; interrupts = <0 4 4>; dma-channels = <8>; snps,dma-masters = <1>; snps,data-width = <3>; snps,block-size = <0x10000 0x10000 0x10000 0x10000 0x10000 0x10000 0x10000 0x10000>; snps,priority = <0 1 2 3 4 5 6 7>; snps,axi-max-burst-len = <4>; status = "disabled"; };

这是一个 AXI DMA 控制器的设备树节点，它的注册地址是0x35540000，数据宽度为3字节，支持8个 DMA 通道和1个 DMA 主设备，块大小为0x10000，优先级顺序为0-7，AXI 最大突发长度为4。同时，该节点还包含一个 DMA 多路复用器的地址0x30470000，用于多路复用模式下的 DMA 传输。该节点当前处于禁用状态。