device tree笔记

 

参考博客：  https://blog.youkuaiyun.com/radianceblau/article/details/74722395

 

1. status 属性

一般再.dtsi 里置为disabled，dts里重写为okay；如果不重写为okay，那么driver和deivce不会match，走不到驱动的probe函数。     

sdhci0: sdhci@ff160000 {
            u-boot,dm-pre-reloc;
            compatible = "xlnx,zynqmp-8.9a", "arasan,sdhci-8.9a";
            status = "disabled";

可在.dts里重写为okay

&sdhci0 {
    status = "okay";
    pinctrl-names = "default";
    pinctrl-0 = <&pinctrl_sdhci0_default>;
    no-1-8-v;
    xlnx,mio_bank = <0>;
};