OpenWrt 将GPIO注册为一个led灯、按钮

配置

"make menuconfig"命令进入配置界面，选择Led、Button驱动（默认编译的时候已经选上）

选择len、button驱动

Led 驱动:

LED modules    --->   <*> kmod-leds-gpio 
                      <*> kmod-ledtrig-usbdev

Button 驱动:

Other modules  --->   <*> kmod-gpio-button-hotplug.

修改dts注册led、按钮(以WRTnode1为准)

打开并修改WRTNODE.dts

添加相关设备树、注册一个led灯

其中WRTnode1的led灯添加如下:

+    gpio-leds {
+        compatible = "gpio-leds";
+        indicator {
+            label = "wrtnode:blue:indicator";
+            gpios = <&gpio1 14 1>;
+        };
+    }; 

compatible要与Led的驱动leds-gpio.c里compatible对应。label是设备的名字，在文件系统/sys/class/leds/目录下设备名对应
gpios = <&gpio1 14 1>,这是指定对应的gpio引脚（GPIO#38）

 

注册Button

+    gpio-keys-polled {
+       compatible = "gpio-keys-polled";
+        #address-cells = <1>;
+        #size-cells = <0>;
+        poll-interval = <20>;
+        reset {
+            label = "reset";
+            gpios = <&gpio0 1 1>;
+            linux,code = <0x198>;
+          };
+    };