[PATCH 1/4] devicetree: bindings: Update gpio-keys-polled with support for abs/rel axis
robh at kernel.org
Thu Sep 10 10:45:35 PDT 2015
On 09/09/2015 04:11 AM, Hans de Goede wrote:
> The devicetree binding for gpio-keys-polled already allows specifying
> what type of events (key / rel / abs) a button generates when pressed.
> But for rel / abs axis we also need to specify which value this specific
> gpio represents.
> One usecase is digital joysticks / direction-pads which are hooked up to
> gpio, in this case we've left and right buttons which we want to map to
> EV_ABS, ABS_X and we want generate events for left with a value of -1 and
> for right with a value of +1 (and similar for up / down and ABS_Y).
One minor comment, otherwise:
Acked-by: Rob Herring <robh at kernel.org>
> Signed-off-by: Hans de Goede <hdegoede at redhat.com>
> Documentation/devicetree/bindings/input/gpio-keys-polled.txt | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
> diff --git a/Documentation/devicetree/bindings/input/gpio-keys-polled.txt b/Documentation/devicetree/bindings/input/gpio-keys-polled.txt
> index 313abef..ab4b09b 100644
> --- a/Documentation/devicetree/bindings/input/gpio-keys-polled.txt
> +++ b/Documentation/devicetree/bindings/input/gpio-keys-polled.txt
> @@ -13,11 +13,16 @@ 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 send for events this button generates when pressed.
> + EV_ABS axis will generate an event with a value of 0 when all
> + buttons with linux,input-type == EV_ABS and linux,code == axis
> + are released.
> - debounce-interval: Debouncing interval time in milliseconds.
> If not specified defaults to 5.
> - gpio-key,wakeup: Boolean, button can wake-up the system.
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