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-rw-r--r--Documentation/devicetree/bindings/input/gpio-keys-polled.txt10
1 files changed, 9 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/input/gpio-keys-polled.txt b/Documentation/devicetree/bindings/input/gpio-keys-polled.txt
index 5b91f5a3b..95d0fb11a 100644
--- a/Documentation/devicetree/bindings/input/gpio-keys-polled.txt
+++ b/Documentation/devicetree/bindings/input/gpio-keys-polled.txt
@@ -13,14 +13,22 @@ Subnode properties:
- gpios: OF device-tree gpio specification.
- label: Descriptive name of the key.
- - linux,code: Keycode to emit.
+ - 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: