linux-kernel - Re: [PATCH RFC 1/3] dt-bindings: input: elan: Introduce Elan eKTP1059 Touchpad

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Message-ID: <20251028-unlocking-designing-efbdc8ca49df@spud>
Date: Tue, 28 Oct 2025 19:49:07 +0000
From: Conor Dooley <conor@...nel.org>
To: Andreas Kemnade <andreas@...nade.info>
Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Henrik Rydberg <rydberg@...math.org>,
	Tony Lindgren <tony@...mide.com>, hns@...delico.com,
	linux-input@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH RFC 1/3] dt-bindings: input: elan: Introduce Elan
 eKTP1059 Touchpad

On Tue, Oct 28, 2025 at 08:41:49PM +0100, Andreas Kemnade wrote:
> On Mon, 25 Aug 2025 17:40:56 +0100
> Conor Dooley <conor@...nel.org> wrote:
> 
> > On Mon, Aug 25, 2025 at 12:07:28AM +0200, Andreas Kemnade wrote:
> > > The Elan eKTP1059 Touchpad is seen in the Epson Moverio BT-200
> > > attached via SPI. Add a binding for this chip. Little is known.
> > > 
> > > Signed-off-by: Andreas Kemnade <andreas@...nade.info>
> > > ---
> > >  .../devicetree/bindings/input/elan,ektp1059.yaml   | 45 ++++++++++++++++++++++
> > >  1 file changed, 45 insertions(+)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/input/elan,ektp1059.yaml b/Documentation/devicetree/bindings/input/elan,ektp1059.yaml
> > > new file mode 100644
> > > index 000000000000..a10256a271e0
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/input/elan,ektp1059.yaml
> > > @@ -0,0 +1,45 @@
> > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/input/elan,ektp1059.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Elantech SPI Touchpad
> > > +
> > > +maintainers:
> > > +  - Andreas Kemnade <andreas@...nade.info>
> > > +
> > > +allOf:
> > > +  - $ref: touchscreen/touchscreen.yaml#
> > > +
> > > +properties:
> > > +  compatible:
> > > +    const: elan,ektp1059
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +
> > > +  interrupts:
> > > +    maxItems: 1
> > > +
> > > +required:
> > > +  - compatible
> > > +  - reg
> > > +  - interrupts
> > > +
> > > +additionalProperties: false  

btw, there's two spaces at EOL here. Is that in the patch itself, or
just a mail artefact?

> > 
> > Shouldn't this be unevalutedProperties: false, since you want to make
> > use of what's in touchscreen.yaml?
> >
> did not do too much thought about this yet. But am I allowed to use this
> in a touchpad? BTW: who defines whether the chip is a touchpad? T*P* in
> its part number might be a hint, the device where I am using it, uses it
> as a touchpad. But who says it cannot be glued onto some screen?

I've got no idea what you're talking about here, I don't know anything
about the mechanics of touchpad chips. All I am commenting on is that
you're including touchscreen.yaml but do not permit any properties
defined in that binding to be used for this device.

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