linux-kernel - Re: [PATCH v1] Input: rotary-encoder

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Date:   Fri, 14 Jun 2019 16:51:58 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Mylène Josserand <mylene.josserand@...tlin.com>
Cc:     dmitry.torokhov@...il.com, robh+dt@...nel.org,
        mark.rutland@....com, linux-input@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        thomas.petazzoni@...tlin.com
Subject: Re: [PATCH v1] Input: rotary-encoder - Add gpio as push button

Hi Mylene,

On Fri, Jun 14, 2019 at 03:36:51PM +0200, Mylène Josserand wrote:
> Add the support of a gpio that can be defined as a push button.
> Thanks to that, it is possible to emit a keycode in case of a
> "push" event, if the rotary supports that.
>
> The keycode to emit is defined using "linux,code" property
> (such as in gpio-keys).
>
> Signed-off-by: Mylène Josserand <mylene.josserand@...tlin.com>
> ---
>  .../devicetree/bindings/input/rotary-encoder.txt   |  5 +++
>  drivers/input/misc/rotary_encoder.c                | 50 ++++++++++++++++++++++
>  2 files changed, 55 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/input/rotary-encoder.txt b/Documentation/devicetree/bindings/input/rotary-encoder.txt
> index a644408b33b8..1cfce5d0b5c4 100644
> --- a/Documentation/devicetree/bindings/input/rotary-encoder.txt
> +++ b/Documentation/devicetree/bindings/input/rotary-encoder.txt
> @@ -22,6 +22,9 @@ Optional properties:
>  - wakeup-source: Boolean, rotary encoder can wake up the system.
>  - rotary-encoder,encoding: String, the method used to encode steps.
>    Supported are "gray" (the default and more common) and "binary".
> +- push-gpio: a gpio to be used as a detection of a push from the rotary.

According to Documentation/devicetree/bindings/gpio/gpio.txt, GPIO
properties with a -gpio suffix are now deprecated in favor of the
-gpios suffix.

> +- linux,code: keycode to emit with the push-gpio of this rotary encoder.
> +  Required property in case "push-gpio"'s one is used.

I guess we should make it clear in the property name that it's the
keycode emitted at push. Otherwise, it will be ambiguous between the
rotary itself, or the button.

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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