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Linux中pinctrl使用

news 2025/10/19 11:37:51

一.背景
高通平台如果IO为EGPIO，需要在添加pinctrl配置成gpio模式才能正常读写；
有些场景需要切换复用的pin脚功能，需要使用pinctrl；

二.Pinctrl接口
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
struct pinctrl *p;
struct pinctrl_state *active_state;

devm_pinctrl_get();            //获取设备的pin contro句柄；
pinctrl_lookup_state();    //根据名称查找pin control状态；
pinctrl_select_state()   ;   //切换到指定状态

三. 案例代码

3.1 vendor/qcom/proprietary/devicetree-4.19/qcom/bengal-pinctrl.dtsi

pogo_gpio104_active: pogo_gpio104_active {/* gpio104*/mux {pins = "gpio104";function = "gpio";};config {pins = "gpio104";bias-disable; /* No PULL */drive-strength = <2>; /* 2 MA */};};		pogo_gpio104_suspend: pogo_gpio104_suspend {/* gpio104*/mux {pins = "gpio104";function = "gpio";};config {pins = "gpio104";bias-pull-down; /* PULL DOWN */drive-strength = <2>; /* 2 MA */};};

3.2 vendor/qcom/proprietary/devicetree-4.19/qcom/bengal-qrd.dtsi

	un_gpio{compatible = "qcom,un-gpio";		pinctrl-names = "pogo_active", "pogo_suspend";pinctrl-0 = <&pogo_gpio104_active>;pinctrl-1 = <&pogo_gpio104_suspend>; 				qcom,gpio_5v_enable = <&tlmm 104 0x00>;}

3.3 kernel/msm-4.19/drivers/un_gpio/un_gpio.c

	p=devm_pinctrl_get(&pdev->dev);default_state = pinctrl_lookup_state(p, "pogo_default");suspend_state = pinctrl_lookup_state(p, "pogo_suspend");pinctrl_select_state(p,default_state); //唤醒时配置gpio模式、No pull、驱动电流2mApinctrl_select_state(p,suspend_state); //休眠时配置gpio模式、Pull down、驱动电流2mA

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