yocto spidev修改设备树增加片选信号

1.直接修改已经fetch到tmp目录的dtsi文件

$ vi ./tmp/work-shared/xarina-s-evb/kernel-source/arch/arm/boot/dts/xarina_standard_spi_pl022.dtsi

  

                              pl022,com-mode = <2>;
                                pl022,rx-level-trig = <1>;
                                pl022,tx-level-trig = <1>;
                                pl022,duplex = <0>;
                        };
                };
                spi_b: spi@ff28c000 {
                        compatible = "arm,pl022", "arm,primecell";
                        arm,primecell-periphid = <0x41022>;
                        reg = <0xff28c000 0x1000>;
                        interrupts = ;
                        clocks = <&clk_spi_b 0>, <&apb_pclk 0>;
                        clock-names = "spiclk", "apb_pclk";
                        dmas = <&dmacc 3 1>, <&dmacc 2 1>;
                        dma-names = "tx", "rx";
                        num-cs = <1>;
                        cs-gpios = <&gpio_m0 3 3>;
                        status = "disabled";
                        #address-cells = <1>;
                        #size-cells = <0>;
                        slave@0 {
                                compatible = "spidev";
                                reg = <0>;
                                spi-max-frequency = <250000>;
                                pl022,interface = <0>;
                                pl022,slave-tx-disable;
                                pl022,com-mode = <2>;
                                pl022,rx-level-trig = <1>;
                                pl022,tx-level-trig = <1>;
                                pl022,duplex = <0>;
                        };
                };
                spi_c: spi@ff28d000 {
                        compatible = "arm,pl022", "arm,primecell";

2. 清除内核工程的compile清除状态标志并重新编译

$bitbake -C compile linux-yocto                                （大写-C表示清除状态标志后再重新执行）  

 

3. 重新编译整个工程并打包

$make -j16