UART0 如何使用DMA模式，而不是interrupt模式？

• kevinguan

  Posts: 3

  Joined: 2024-10-30 3:10

  2024-10-31 1:41

  目前提示为interrupt 模式，如何改成dma模式？
  [ 21.798421] of_dma_request_slave_channel: dma-names property of node '/serial@ff4a0000' missing or empty
  [ 21.798452] dw-apb-uart ff4a0000.serial: failed to request DMA, use interrupt mode
  
  dts如下：
  uart0: serial@ff4a0000 {
  compatible = "rockchip,rv1106-uart", "snps,dw-apb-uart";
  reg = <0xff4a0000 0x100>;
  interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
  reg-shift = <2>;
  reg-io-width = <4>;
  dmas = <&dmac 7>, <&dmac 6>;
  clock-frequency = <24000000>;
  clocks = <&cru SCLK_UART0>, <&cru PCLK_UART0>;
  clock-names = "baudclk", "apb_pclk";
  pinctrl-names = "default";
  pinctrl-0 = <&uart0m0_xfer>;
  status = "okay";
  };

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