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Diffstat (limited to 'Documentation/devicetree/bindings/input/gpio-keys-polled.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/input/gpio-keys-polled.txt | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/input/gpio-keys-polled.txt b/Documentation/devicetree/bindings/input/gpio-keys-polled.txt new file mode 100644 index 000000000..4d9a3717e --- /dev/null +++ b/Documentation/devicetree/bindings/input/gpio-keys-polled.txt @@ -0,0 +1,45 @@ +Device-Tree bindings for input/gpio_keys_polled.c keyboard driver + +Required properties: + - compatible = "gpio-keys-polled"; + - poll-interval: Poll interval time in milliseconds + +Optional properties: + - autorepeat: Boolean, Enable auto repeat feature of Linux input + subsystem. + +Each button (key) is represented as a sub-node of "gpio-keys-polled": +Subnode properties: + + - gpios: OF device-tree gpio specification. + - label: Descriptive name of the key. + - linux,code: Key / Axis code to emit. + +Optional subnode-properties: + - linux,input-type: Specify event type this button/key generates. + If not specified defaults to <1> == EV_KEY. + - linux,input-value: If linux,input-type is EV_ABS or EV_REL then this + value is sent for events this button generates when pressed. + EV_ABS/EV_REL axis will generate an event with a value of 0 when + all buttons with linux,input-type == type and linux,code == axis + are released. This value is interpreted as a signed 32 bit value, + e.g. to make a button generate a value of -1 use: + linux,input-value = <0xffffffff>; /* -1 */ + - debounce-interval: Debouncing interval time in milliseconds. + If not specified defaults to 5. + - wakeup-source: Boolean, button can wake-up the system. + (Legacy property supported: "gpio-key,wakeup") + +Example nodes: + + gpio_keys_polled { + compatible = "gpio-keys-polled"; + poll-interval = <100>; + autorepeat; + + button21 { + label = "GPIO Key UP"; + linux,code = <103>; + gpios = <&gpio1 0 1>; + }; + ... |