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Linux驱动模块加载失败

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Linux驱动模块加载失败

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提示:

/lib/modules/4.1.15 # modprobe gpioled.ko
gpioled node is found!
led-gpio num = 3
can't request led gpio!
gpioled node is found!
led-gpio num = 3
can't request led gpio!
modprobe: can't load module gpioled.ko (gpioled.ko): Invalid argument

查找原因:
can’t request led gpio!
->can’t load module gpioled.ko
->Invalid argument
据原子哥提示,GPIO请求失败,很大概率是GPIO使用冲突了!!!
打开Linux内核源码,找到自己开发板对应的设备树源文件XXX.dts,在当前文件下搜索led的GPIO有哪些设备在用:MX6UL_PAD_GPIO1_IO03__GPIO1_IO03
搜索发现:除了我的pinctrlgpioled节点在使用

pinctrl_gpioled: ledgrp{
			fsl,pin = <
			MX6UL_PAD_GPIO1_IO03__GPIO1_IO03	0x10B0
			>;
		};

还有pinctrl_tsc设备节点也在使用该GPIO:

pinctrl_tsc: tscgrp {
			fsl,pins = <
				MX6UL_PAD_GPIO1_IO01__GPIO1_IO01	0xb0
				MX6UL_PAD_GPIO1_IO02__GPIO1_IO02	0xb0
				MX6UL_PAD_GPIO1_IO03__GPIO1_IO03	0xb0	// 此处为冲突使用的GPIO
				MX6UL_PAD_GPIO1_IO04__GPIO1_IO04	0xb0
			>;
		};

将冲突使用的GPIO屏蔽掉就可以正常使用,除了屏蔽pinctrl节点的GPIO,还要屏蔽其他所有对该GPIO(GPIO1_IO03)有操作的地方,比如:

&tsc {
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_tsc>;
	xnur-gpio = <&gpio1 3 GPIO_ACTIVE_LOW>;	// 此处为对该GPIO有操作的地方,也应该被屏蔽
	measure-delay-time = <0xffff>;
	pre-charge-time = <0xfff>;
	status = "okay";
};

屏蔽后的代码:

/* MX6UL_PAD_GPIO1_IO03__GPIO1_IO03	0xb0 */
/* xnur-gpio = <&gpio1 3 GPIO_ACTIVE_LOW>; */

屏蔽上述两行代码后,重新加载驱动,成功!!!

/lib/modules/4.1.15 # depmod
/lib/modules/4.1.15 # modprobe gpioled.ko
gpioled node is found!
led-gpio num = 3
major is 249, minor is 0

标签:led,Linux,ko,pinctrl,模块,GPIO,gpio,gpioled,加载
来源: https://blog.csdn.net/ZigeSu/article/details/118343103