1 LEDs connected to GPIO lines 2 3 Required properties: 4 - compatible : should be "gpio-leds". 5 6 Each LED is represented as a sub-node of the gpio-leds device. Each 7 node's name represents the name of the corresponding LED. 8 9 LED sub-node properties: 10 - gpios : Should specify the LED's GPIO, see "gpios property" in 11 Documentation/devicetree/bindings/gpio/gpio.txt. Active low LEDs should be 12 indicated using flags in the GPIO specifier. 13 - label : (optional) 14 see Documentation/devicetree/bindings/leds/common.txt 15 - linux,default-trigger : (optional) 16 see Documentation/devicetree/bindings/leds/common.txt 17 - default-state: (optional) The initial state of the LED. Valid 18 values are "on", "off", and "keep". If the LED is already on or off 19 and the default-state property is set the to same value, then no 20 glitch should be produced where the LED momentarily turns off (or 21 on). The "keep" setting will keep the LED at whatever its current 22 state is, without producing a glitch. The default is off if this 23 property is not present. 24 25 Examples: 26 27 leds { 28 compatible = "gpio-leds"; 29 hdd { 30 label = "IDE Activity"; 31 gpios = <&mcu_pio 0 1>; /* Active low */ 32 linux,default-trigger = "ide-disk"; 33 }; 34 35 fault { 36 gpios = <&mcu_pio 1 0>; 37 /* Keep LED on if BIOS detected hardware fault */ 38 default-state = "keep"; 39 }; 40 }; 41 42 run-control { 43 compatible = "gpio-leds"; 44 red { 45 gpios = <&mpc8572 6 0>; 46 default-state = "off"; 47 }; 48 green { 49 gpios = <&mpc8572 7 0>; 50 default-state = "on"; 51 }; 52 }; 53
