38 pinctrl（四）pinctrl driver

前言

一些使用技巧

• 查看设备支持的pinctrl

  ls /sys/kernel/debug/pinctrl/
  

  

• 查看pinctrl中支持的引脚、组、function

  cat /sys/kernel/debug/pinctrl/20e0000.iomuxc/pins
  cat /sys/kernel/debug/pinctrl/20e0000.iomuxc/pingroups
  cat /sys/kernel/debug/pinctrl/20e0000.iomuxc/pinmux-functions
  

  

  

  

1. pinctrl init driver

1.1 device tree

1.2 driver init

2. pinctrl driver

2.1 pinctrl driver probe

• imx6ul_pinctrl_probe

  static int (struct platform_device *pdev)
  {
  	const struct of_device_id *match;
  	struct imx_pinctrl_soc_info *pinctrl_info;
  
  	/* 从of_device_id 中取出私有data */
  	match = of_match_device(imx6ul_pinctrl_of_match, &pdev->dev);
  
  	if (!match)
  		return -ENODEV;
  
  	pinctrl_info = (struct imx_pinctrl_soc_info *) match->data;
  
  	return imx_pinctrl_probe(pdev, pinctrl_info);
  }
  

  私有的数据中定义了设备支持引脚信息

  

• imx_pinctrl_probe

  

• imx_pinctrl_probe_dt
  dtb反编译出来设备树如下