内核配置加上如下配置
CONFIG_NEW_LEDS=y
CONFIG_LEDS_CLASS=y
CONFIG_LEDS_GPIO=y
CONFIG_LEDS_TRIGGERS=y
CONFIG_LEDS_TRIGGER_TIMER=y
CONFIG_LEDS_TRIGGER_HEARTBEAT=y
CONFIG_LEDS_TRIGGER_CPU=y
CONFIG_LEDS_TRIGGER_DEFAULT_ON=y
设备树节点
leds: leds { compatible = "gpio-leds"; work_led: work { gpios = <&gpio1 RK_PA4 GPIO_ACTIVE_HIGH>; linux,default-trigger = "heartbeat"; status = "okay"; };
};