linux-kernel - Re: [PATCH V2 2/2] Input: rotaty-encoder

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Date:   Mon, 14 Jan 2019 19:53:34 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Donghoon Han <nazgul33@...il.com>, Rob Herring <robh+dt@...nel.org>
Cc:     linux-input@...r.kernel.org, Daniel Mack <daniel@...aq.de>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH V2 2/2] Input: rotaty-encoder - Add DT binding document

[ resending to Rob... ]
On Tue, Jan 08, 2019 at 01:42:49AM +0900, Donghoon Han wrote:
> Add DT binding document for rotary-encoder, keycode options.
> 
> Signed-off-by: Donghoon Han <nazgul33@...il.com>
> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Cc: Daniel Mack <daniel@...aq.de>
> Cc: devicetree@...r.kernel.org
> To: linux-input@...r.kernel.org
> ---
>  .../devicetree/bindings/input/rotary-encoder.txt     | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/input/rotary-encoder.txt b/Documentation/devicetree/bindings/input/rotary-encoder.txt
> index f99fe5cdeaec..9986ec2af2d4 100644
> --- a/Documentation/devicetree/bindings/input/rotary-encoder.txt
> +++ b/Documentation/devicetree/bindings/input/rotary-encoder.txt
> @@ -12,6 +12,10 @@ Optional properties:
>  - rotary-encoder,relative-axis: register a relative axis rather than an
>    absolute one. Relative axis will only generate +1/-1 events on the input
>    device, hence no steps need to be passed.
> +- rotary-encoder,relative-keys : generate pair of key events. This setting
> +  behaves just like relative-axis, generating key events instead.
> +  (Keycodes[2] corresponds to -1/1 events.)
> +- rotary-encoder,relative-keycodes : keycodes for relative-keys

Given that keycodes are linux-specific, I think the property should be
linux,keycodes. Also, I am not sure we need separate
rotary-encoder,relative-keys property as we can infer that we want to
generate keys from presence of linux,keycodes property.

Rob, any comments?

>  - rotary-encoder,rollover: Automatic rollover when the rotary value becomes
>    greater than the specified steps or smaller than 0. For absolute axis only.
>  - rotary-encoder,steps-per-period: Number of steps (stable states) per period.
> @@ -48,3 +52,11 @@ Example:
>  			rotary-encoder,encoding = "binary";
>  			rotary-encoder,rollover;
>  		};
> +
> +		rotary@2 {
> +			compatible = "rotary-encoder";
> +			gpios = <&gpio 21 0>, <&gpio 22 0>;
> +			rotary-encoder,relative-keys;
> +			rotary-encoder,relative-keycode = <103>, <108>;
> +			rotary-encoder,steps-per-period = <2>;
> +		};
> -- 
> 2.17.1
> 

Thanks.

-- 
Dmitry