openwrt中已经支持 RT5350 的SPI I2C等驱动。

一、选择SPI、I2C 功能

-> Kernel modules
  -> SPI Support
  -> I2C support

二、修改设备树

vi target/linux/ramips/dts/rt5350.dtsi

 i2c@900 {
                        compatible = "link,rt5350-i2c", "ralink,rt2880-i2c";
                        reg = <0x900 0x100>;

                        resets = <&rstctrl 16>;
                        reset-names = "i2c";

                        #address-cells = <1>;
                        #size-cells = <0>;

                        pinctrl-names = "default";
                        pinctrl-0 = <&i2c_pins>;

                        status = "disabled";
                };

                spi@b00 {
                        compatible = "ralink,rt5350-spi";
                        reg = <0xb00 0x100>;

                        resets = <&rstctrl 18>;
                        reset-names = "spi";

                        #address-cells = <1>;
                        #size-cells = <1>;

                        pinctrl-names = "default";
                        pinctrl-0 = <&spi_pins &spi_cs1>;

                        status = "disabled";
                };

配置文件默认是不启用 SPI I2C 的。我们需要把 status = “disabled”; 改为 status = “okay”;对于 I2C，我们还要修改模板设备树文件：

pinctrl {
                state_default: pinctrl0 {
                        gpio {
                                ralink,group = "i2c", "jtag", "rgmii", "mdio", "uartf";
                                ralink,function = "gpio";
                        };
                };
        };

复用功能”i2c”,”jtag”, “rgmii”, “mdio”, “uartf” 等默认都复用为 gpio 口，要启用 I2C，需要去掉 i2c。同样，我们还需要启用 uartf。所有，修改为：

pinctrl {
                state_default: pinctrl0 {
                        gpio {
                                ralink,group =  "jtag", "rgmii", "mdio";
                                ralink,function = "gpio";
                        };
                };
        };

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