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

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Date:   Sun, 6 Jan 2019 12:41:36 +0900
From:   nazgul33 <nazgul33@...il.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        Daniel Mack <daniel@...aq.de>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] Input: rotaty-encoder - Add DT binding document

Yes, it's needed.
Even with the same encoder, adjusting steps affects rate of event generation.
(the steps defines 1 cycle of encoder rotation, and 1 cycle = 1 key event.)

On Sun, Jan 6, 2019 at 8:11 AM Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
>
> On Sat, Jan 5, 2019 at 2:27 PM Donghoon Han <nazgul33@...il.com> wrote:
> >
> > Add DT binding document for rotary-encoder, keycode options.
> >
> > Signed-off-by: Donghoon Han <nazgul33@...il.com>
> > ---
> >  .../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..113640079de3 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. keycode[2]
> > +  corresponds -1/1 events.
> > +- rotary-encoder,relative-keycodes : keycodes for relative-keys
> >  - 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>;
>
> Do you need steps for keys? They weren't required for the relative axis mode.
>
> Thanks.
>
> --
> Dmitry



-- 
한동훈 드림.