linux-kernel - Re: [PATCH v1 3/6] dt-bindings: mediatek,mt6779-keypad: add mediatek,double-keys

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Date:   Thu, 21 Jul 2022 15:34:11 +0200
From:   Mattijs Korpershoek <mkorpershoek@...libre.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        Fabien Parent <parent.f@...il.com>, devicetree@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        Fabien Parent <fparent@...libre.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v1 3/6] dt-bindings: mediatek,mt6779-keypad: add
 mediatek,double-keys

On Thu, Jul 21, 2022 at 10:40, AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com> wrote:

> Il 20/07/22 16:48, Mattijs Korpershoek ha scritto:
>> MediaTek keypad has 2 modes of detecting key events:
>> - single key: each (row, column) can detect one key
>> - double key: each (row, column) is a group of 2 keys
>> 
>> Currently, only single key detection is supported (by default)
>> Add an optional property, mediatek,double-keys to support double
>> key detection.
>> 
>> Double key support exists to minimize cost, since it reduces the number
>> of pins required for physical keys.
>> 
>> Signed-off-by: Mattijs Korpershoek <mkorpershoek@...libre.com>
>> 
>> diff --git a/Documentation/devicetree/bindings/input/mediatek,mt6779-keypad.yaml b/Documentation/devicetree/bindings/input/mediatek,mt6779-keypad.yaml
>> index ca8ae40a73f7..03c9555849e5 100644
>> --- a/Documentation/devicetree/bindings/input/mediatek,mt6779-keypad.yaml
>> +++ b/Documentation/devicetree/bindings/input/mediatek,mt6779-keypad.yaml
>> @@ -49,6 +49,12 @@ properties:
>>       maximum: 256
>>       default: 16
>>   
>> +  mediatek,double-keys:
>> +    description: |
>> +      use double key matrix instead of single key
>> +      when set, each (row,column) is a group that can detect 2 keys
>
> We can make it shorter and (imo) easier to understand, like:
>
>    mediatek,double-keys:
>
>      description: Each (row, column) group has two keys
>
> ...also because, if we say that the group "can detect" two keys, it may be
> creating a misunderstandment such as "if I press one key, it gives me two
> different input events for two different keys.", which is something that
> wouldn't make a lot of sense, would it? :-)

Hi AngeloGioacchino,

Thank you for the suggestion. I like your description better as well :)
Will use it in v2.

>
>> +    type: boolean
>> +
>>   required:
>>     - compatible
>>     - reg