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>;
                        };
                };