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Diffstat (limited to 'Documentation/devicetree/bindings/leds')
-rw-r--r-- | Documentation/devicetree/bindings/leds/leds-gpio.txt | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/leds/leds-gpio.txt b/Documentation/devicetree/bindings/leds/leds-gpio.txt new file mode 100644 index 000000000000..df1b3080f6b8 --- /dev/null +++ b/Documentation/devicetree/bindings/leds/leds-gpio.txt | |||
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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 | }; | ||