linux-kernel - Re: [PATCH v2 2/2] dt-bindings: can: tcan4x5x: Document the ti,nwkrq-voltage-sel option

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Message-ID: <20241112163723.GA1142553-robh@kernel.org>
Date: Tue, 12 Nov 2024 10:37:23 -0600
From: Rob Herring <robh@...nel.org>
To: Sean Nyekjaer <sean@...nix.com>
Cc: Marc Kleine-Budde <mkl@...gutronix.de>,
	Vincent Mailhol <mailhol.vincent@...adoo.fr>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-can@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v2 2/2] dt-bindings: can: tcan4x5x: Document the
 ti,nwkrq-voltage-sel option

On Tue, Nov 12, 2024 at 08:40:56AM +0100, Sean Nyekjaer wrote:
> Hi Marc,
> 
> On Tue, Nov 12, 2024 at 08:35:43AM +0100, Marc Kleine-Budde wrote:
> > On 11.11.2024 09:54:50, Sean Nyekjaer wrote:
> > > nWKRQ supports an output voltage of either the internal reference voltage
> > > (3.6V) or the reference voltage of the digital interface 0 - 6V.
> > > Add the devicetree option ti,nwkrq-voltage-sel to be able to select
> > > between them.
> > > 
> > > Signed-off-by: Sean Nyekjaer <sean@...nix.com>
> > > ---
> > >  Documentation/devicetree/bindings/net/can/ti,tcan4x5x.yaml | 13 +++++++++++++
> > >  1 file changed, 13 insertions(+)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/net/can/ti,tcan4x5x.yaml b/Documentation/devicetree/bindings/net/can/ti,tcan4x5x.yaml
> > > index f1d18a5461e05296998ae9bf09bdfa1226580131..a77c560868d689e92ded08b9deb43e5a2b89bf2b 100644
> > > --- a/Documentation/devicetree/bindings/net/can/ti,tcan4x5x.yaml
> > > +++ b/Documentation/devicetree/bindings/net/can/ti,tcan4x5x.yaml
> > > @@ -106,6 +106,18 @@ properties:
> > >        Must be half or less of "clocks" frequency.
> > >      maximum: 18000000
> > >  
> > > +  ti,nwkrq-voltage-sel:
> > > +    $ref: /schemas/types.yaml#/definitions/uint8
> > > +    description:
> > > +      nWKRQ Pin GPO buffer voltage rail configuration.
> > > +      The option of this properties will tell which
> > > +      voltage rail is used for the nWKRQ Pin.
> > > +    oneOf:
> > > +      - description: Internal voltage rail
> > > +        const: 0
> > > +      - description: VIO voltage rail
> > > +        const: 1
> > 
> > We usually don't want to put register values into the DT. Is 0, i.e. the
> > internal voltage rail the default? Is using a boolean better here?
> > 
> > regards,
> > Marc
> > 
> 
> Thanks for the review :)
> 
> Can you come up with a sane naming?
> A boolean that equals true when it's set to VIO voltage? Or the other
> way around?

Make the property named/present for the less common case if there is 
one. That might not be known here.

Rob