iTOP-IMX6Q开发板设备树-RFID驱动-修改手册

发布时间：2019-10-15 10:19 发布者：落风

1.内核
拷贝rc522驱动到iTOP-iMX6_android6.0.1/kernel_imx/drivers/spi目录下。
打开iTOP-iMX6_android6.0.1/kernel_imx/drivers/spi/Makefile
添加：
obj-$(CONFIG_SPI_RC522)    += rc522.o

iTOP-iMX6_android6.0.1/kernel_imx/drivers/spi/Kconfig
在文件末尾添加：
config SPI_RC522
      tristate "RC522 Module driver support"
      help
      This supports RC522 Module drivers.

2.修改设备树文件
iTOP-iMX6_android6.0.1/kernel_imx/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
(1)添加：
&ecspi2 {
      fsl,spi-num-chipselects = <1>;
      cs-gpios = <&gpio2 27 0>;
      pinctrl-names = "default";
      pinctrl-0 = <&pinctrl_ecspi2>;
      status = "okay";

      rfid: rc522@0 {
            #address-cells = <1>;
            #size-cells = <1>;
            compatible = "rc522";
            spi-max-frequency = <10000000>;
            reg = <0>;
      };
};

pinctrl_ecspi2: ecspi2grp {
                     fsl,pins = <
                              MX6QDL_PAD_EIM_OE__ECSPI2_MISO       0x100b1
                              MX6QDL_PAD_EIM_CS1__ECSPI2_MOSI       0x100b1
                              MX6QDL_PAD_EIM_CS0__ECSPI2_SCLK       0x100b1
                              MX6QDL_PAD_EIM_LBA__GPIO2_IO27       0x1b0b0
                     >;
            };

(2)注释语句
MX6QDL_PAD_EIM_CS1__GPIO2_IO24 0x80000000

iTOP-IMX6Q开发板设备树-RFID驱动-修改手册

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