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