zoukankan      html  css  js  c++  java
  • linux内核如何为gpio 扩展芯片驱动添加设备节点?

    1. 关注属性gpio-hog

       GPIO hogging is a mechanism providing automatic GPIO request and configuration as part of the gpio-controller's driver probe function.(gpio-hog是一种提供自动gpio资源申请并且配置为gpio控制器驱动探测函数的一部分的机制)
    2. 举例
        pca9554:pca9554@20 {
      compatible = "nxp,pca9554";
      reg=<0x20>;
        gpio-controller;
      #gpio-cells=<2>;
      interrupt-controller;
      #interrupt-cells = <2>;
      interrupt-parent = <&gpio3>;
      interrupts = <28 IRQ_TYPE_NONE>;

          P00 {
        gpio-hog;
        gpios = <0 GPIO_ACTIVE_LOW>;
        output-high;
        line-name = "led_normal";
      }
        }
    3. 如何引用pca9554节点?
      displayport {
            dp.aux_sw_oe = <&pca9554 4 GPIO_ACTIVE_HIGH>
            dp.sbu_sw_sel = <&pca9554 1 GPIO_ACTIVE_HIGH>
        }; 
  • 相关阅读:
    每日日报16
    每日日报15
    每日日报14
    每日日报13
    每日日报12
    每日日报11
    每日日报10
    每日作业报告
    每日作业报告
    每日作业报告
  • 原文地址:https://www.cnblogs.com/dakewei/p/12322476.html
Copyright © 2011-2022 走看看