Device-Tree bindings for input/keyboard/gpio_keys.c keyboard driver
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Required properties:
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- compatible = "gpio-keys";
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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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- label: String, name of the input device.
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Each button (key) is represented as a sub-node of "gpio-keys":
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Subnode properties:
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- gpios: OF device-tree gpio specification.
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- interrupts: the interrupt line for that input.
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- label: Descriptive name of the key.
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- linux,code: Keycode to emit.
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Note that either "interrupts" or "gpios" properties can be omitted, but not
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both at the same time. Specifying both properties is allowed.
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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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- 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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- wakeup-event-action: Specifies whether the key should wake the
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system when asserted, when deasserted, or both. This property is
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only valid for keys that wake up the system (e.g., when the
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"wakeup-source" property is also provided).
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Supported values are defined in linux-event-codes.h:
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EV_ACT_ASSERTED - asserted
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EV_ACT_DEASSERTED - deasserted
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EV_ACT_ANY - both asserted and deasserted
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- linux,can-disable: Boolean, indicates that button is connected
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to dedicated (not shared) interrupt which can be disabled to
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suppress events from the button.
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Example nodes:
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gpio-keys {
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compatible = "gpio-keys";
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autorepeat;
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up {
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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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down {
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label = "GPIO Key DOWN";
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linux,code = <108>;
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interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
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};
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...
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