openwrt rt5350 SPI I2C驱动简单说明

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在openwrt中已经支持 RT5350 的SPI I2C等驱动。

1 只需要在内核模块选上即可：

make menuconfig

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

根据自己的需求选中模块。

2 修改配置文件

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";                };

我们可以看到。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 。我们还要修改这个文件：
vi target/linux/ramips/dts/MPRA2.dts

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

可以看到。”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";                        };                };        };

make V=s

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