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向led:flash_0节点写入亮度值 向led:switch_0节点的bringhtness写1，开启闪光灯。

有一个gpio控制LED，我echo 255 > brightness会输出一个高电平。gpio-leds { compatible = "gpio-leds"; pinctrl-names = "default"; pinctrl-0 = <&gpio_led_off>; button-backlight { gpios = <&tlmm 42 0>; //label = "

static int aw2013_led_probe(struct i2c_client *client, const struct i2c_device_id *id){ struct aw2013_led *led_array; struct device_node *node; int ret, hall_gpio_state,num_leds = 0; node = client->dev.of_node; if (node == NULL) return -.

msm-pm660l.dtsi相关节点。qcom,leds@d000 { compatible = "qcom,leds-qpnp"; reg = <0xd000 0x100>; label = "rgb"; red_led: qcom,rgb_0 { label = "rgb"; qcom,id = <3>; qcom,mode = "pwm"; pwms = <&pm660l_pwm_3 0 0>