led_count 改为 4：
&ledc {
pinctrl-names = "default", "sleep";
pinctrl-0 = <&ledc_pins_a>;
pinctrl-1 = <&ledc_pins_b>;
led_count = <4>;
output_mode = "GRB";
reset_ns = <84>;
t1h_ns = <800>;
t1l_ns = <320>;
t0h_ns = <300>;
t0l_ns = <800>;
wait_time0_ns = <84>;
wait_time1_ns = <84>;
wait_data_time_ns = <600000>;
status = "okay";
};
设置红绿蓝三色灯：
echo 20 > /sys/class/leds/sunxi_led0r/brightness
echo 20 > /sys/class/leds/sunxi_led1g/brightness
echo 20 > /sys/class/leds/sunxi_led2r/brightness
echo 20 > /sys/class/leds/sunxi_led3b/brightness
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