linux-kernel - Re: [PATCH v4 2/2] dt-bindings: input: Update dtbinding for adp5588

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Message-ID: <20240702-comic-tannery-792d461e0ab7@spud>
Date: Tue, 2 Jul 2024 16:42:06 +0100
From: Conor Dooley <conor@...nel.org>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: utsav.agarwal@...log.com,
	Michael Hennerich <michael.hennerich@...log.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Nuno Sá <nuno.sa@...log.com>,
	linux-input@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Arturs Artamonovs <arturs.artamonovs@...log.com>,
	Vasileios Bimpikas <vasileios.bimpikas@...log.com>,
	Oliver Gaskell <oliver.gaskell@...log.com>
Subject: Re: [PATCH v4 2/2] dt-bindings: input: Update dtbinding for adp5588

On Mon, Jul 01, 2024 at 10:46:09AM -0700, Dmitry Torokhov wrote:
> On Mon, Jul 01, 2024 at 04:46:12PM +0100, Conor Dooley wrote:
> > On Mon, Jul 01, 2024 at 04:04:51PM +0100, Utsav Agarwal via B4 Relay wrote:
> > > From: Utsav Agarwal <utsav.agarwal@...log.com>
> > > 
> > > Updating dt bindings for adp5588. Following properties are now made
> > > optional:
> > > 	- interrupts
> > > 	- keypad,num-rows
> > > 	- keypad,num-columns
> > > 	- linux,keymap
> > > The proposed new property "gpio-only" has been added as an optional
> > > property with an additional example.
> > 
> > I can see that as it is clear in the diff, but this doesn't explain why,
> > which is what you need to do in your commit message.
> > 
> > > 
> > > Signed-off-by: Utsav Agarwal <utsav.agarwal@...log.com>
> > > ---
> > >  .../devicetree/bindings/input/adi,adp5588.yaml     | 28 ++++++++++++++++++----
> > >  1 file changed, 24 insertions(+), 4 deletions(-)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/input/adi,adp5588.yaml b/Documentation/devicetree/bindings/input/adi,adp5588.yaml
> > > index 26ea66834ae2..158fbf02cc16 100644
> > > --- a/Documentation/devicetree/bindings/input/adi,adp5588.yaml
> > > +++ b/Documentation/devicetree/bindings/input/adi,adp5588.yaml
> > > @@ -46,6 +46,11 @@ properties:
> > >    '#gpio-cells':
> > >      const: 2
> > >  
> > > +  gpio-only:
> > > +    description:
> > > +      This property applies if keypad,num-rows, keypad,num-columns and
> > > +      linux,keypad are not specified. All keys will be marked as gpio.
> > 
> > Why is a property required for this? Is the absence of the 3 keypad
> > properties not sufficient to determine that you're in this mode?
> 
> Yes, I think it should be enough.
> 
> > 
> > 
> > >    interrupt-controller:
> > >      description:
> > >        This property applies if either keypad,num-rows lower than 8 or
> > > @@ -68,10 +73,6 @@ properties:
> > >  required:
> > >    - compatible
> > >    - reg
> > > -  - interrupts
> > 
> > I don't understand why interrupts is no longer required.
> 
> I think it should be possible to use this chip as a GPIO controller but
> not an interrupt controller, in which case one does not have to wire up
> the interrupt line from it. However this requires much more elaborate
> binding description (i.e. no keys and no "interrupt-controller"
> property).

Aye. I can totally understand why you might want to make the interrupt
portion optional - but it seems unrelated to the rest of the changes in
the patch (use as a keypad without interrupts could be possible, right?)
and is unexplained.

Cheers,
Conor.

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