我想同时使用 i2c2_M0 与uart3_M1 的管脚 请问设备数 要怎么修改

• liaojiededepan

  Posts: 1

  Joined: 2025-01-18 7:20

  2025-01-18 8:03

  我购买了RV1106G3的Luckfox Pico Ultra
  
  请问 我想同时使用 i2c2_M0 与uart3_M1 的管脚 请问设备数 要怎么修改
  我做了以下的尝试不能成功同时打开两个
  1.内核我启动了e2prom编译,并硬件连接了个e2prom
  
  2.我做了这样的修改
  rv1106.dtsi
  Uart3部分 修改前
  uart3: serial@ff4d0000 {
  compatible = "rockchip,rv1106-uart", "snps,dw-apb-uart";
  reg = <0xff4d0000 0x100>;
  interrupts = <GIC_SPI 28 IRQ_TYPE_LEVEL_HIGH>;
  reg-shift = <2>;
  reg-io-width = <4>;
  dmas = <&dmac 13>, <&dmac 12>;
  clock-frequency = <24000000>;
  clocks = <&cru SCLK_UART3>, <&cru PCLK_UART3>;
  clock-names = "baudclk", "apb_pclk";
  pinctrl-names = "default";
  pinctrl-0 = <&uart3m0_xfer>;
  status = "disabled";
  };
  ===============================
  修改后 改成使用uart3_m1管脚
  
  923 uart3: serial@ff4d0000 {
  924 compatible = "rockchip,rv1106-uart", "snps,dw-apb-uart";
  925 reg = <0xff4d0000 0x100>;
  926 interrupts = <GIC_SPI 28 IRQ_TYPE_LEVEL_HIGH>;
  927 reg-shift = <2>;
  928 reg-io-width = <4>;
  929 dmas = <&dmac 13>, <&dmac 12>;
  930 dma-names = "!tx", "!rx";
  931 clock-frequency = <24000000>;
  932 clocks = <&cru SCLK_UART3>, <&cru PCLK_UART3>;
  933 clock-names = "baudclk", "apb_pclk";
  934 pinctrl-names = "default";
  935 pinctrl-0 = <&uart3m1_xfer>;
  936 status = "okay";
  937 };
  ===============================
  I2c-2 部分修前
  i2c3: i2c@ff460000 {
  compatible = "rockchip,rv1106-i2c", "rockchip,rk3399-i2c";
  reg = <0xff460000 0x1000>;
  interrupts = <GIC_SPI 21 IRQ_TYPE_LEVEL_HIGH>;
  #address-cells = <1>;
  #size-cells = <0>;
  clocks = <&cru CLK_I2C3>, <&cru PCLK_I2C3>;
  clock-names = "i2c", "pclk";
  pinctrl-names = "default";
  pinctrl-0 = <&i2c3m0_xfer>;
  status = "disabled";
  };
  =======================
  I2c-2 部分修后 挂载E2PROM
  
  771 i2c2: i2c@ff450000 {
  772 compatible = "rockchip,rv1106-i2c", "rockchip,rk3399-i2c";
  773 reg = <0xff450000 0x1000>;
  774 interrupts = <GIC_SPI 20 IRQ_TYPE_LEVEL_HIGH>;
  775 #address-cells = <1>;
  776 #size-cells = <0>;
  777 clocks = <&cru CLK_I2C2>, <&cru PCLK_I2C2>;
  778 clock-names = "i2c", "pclk";
  779 pinctrl-names = "default";
  780 pinctrl-0 = <&i2c2m0_xfer>;
  781 clock-frequency = <300000>;
  782 status = "okay";
  783 E2PROM:AT24C256C@50 {
  784 compatible = "atmel,24c256";
  785 reg = <0x50>;
  786 pagesize = <64>;
  787 };
  788
  789 };
  =======================
  
  
  修改后发现 uart3_M1的串口功能可以用,但是i2c_M0 功能用不了

  

  串口打印提示 分配给i2c-2的脚 被ff4d000.serial(就是uart3)占用了
  
  3.在上面的设备树基础上我继续操作
  修改 rv1106-luckfox-pico-ultra-ipc.dtsi
  修改前
  =======================
  
  &uart3 {
  pinctrl-0 = <&uart3m0_xfer &uart3m1_xfer>;
  };
  =======================
  
  修改后
  &uart3 {
  pinctrl-0 = <&uart3m1_xfer>;
  };
  
  发现iic-2 功能可以用了 还检测到了e2prom 并探测出型号

  

  但是串口3 又不能用了
  [root@luckfox dev]# stty -F /dev/ttyS3 115200 cs8 -parenb -cstopb
  stty: /dev/ttyS3: Input/output error
  
  请问我要同时使用 uart3_M1 与i2c-2-M0 我要怎么改设备树啊?

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