netdev - Re: [PATCH net-next v2 2/2] dt-bindings: net: microchip,ksz: document microchip,rmii-clk-internal

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Date: Tue, 17 Oct 2023 08:48:27 +0100
From: Conor Dooley <conor@...nel.org>
To: Ante Knezic <ante.knezic@...mholz.de>
Cc: olteanv@...il.com, andrew@...n.ch, conor+dt@...nel.org,
	davem@...emloft.net, devicetree@...r.kernel.org,
	edumazet@...gle.com, f.fainelli@...il.com,
	krzysztof.kozlowski+dt@...aro.org, kuba@...nel.org,
	linux-kernel@...r.kernel.org, marex@...x.de, netdev@...r.kernel.org,
	pabeni@...hat.com, robh+dt@...nel.org, woojung.huh@...rochip.com
Subject: Re: [PATCH net-next v2 2/2] dt-bindings: net: microchip,ksz:
 document microchip,rmii-clk-internal

On Tue, Oct 17, 2023 at 09:35:48AM +0200, Ante Knezic wrote:
> > > +  microchip,rmii-clk-internal:
> > > +    $ref: /schemas/types.yaml#/definitions/flag
> > > +    description:
> > > +      Set if the RMII reference clock is provided internally. Otherwise
> > > +      reference clock should be provided externally.
> > > +
> > > +if:
> > > +  not:
> > > +    properties:
> > > +      compatible:
> > > +        enum:
> > > +          - microchip,ksz8863
> > > +          - microchip,ksz8873
> > > +then:
> > > +  not:
> > > +    required:
> > > +      - microchip,rmii-clk-internal

I think this bit can become the slightly simpler
	then:
	  properties:
	     microchip,rmii-clk-internal: false

> > I think that what you want to express is that microchip,rmii-clk-internal
> > is only defined for microchip,ksz8863 and microchip,ksz8873.
> > Can't you describe that as "if: properties: compatible: (...) then:
> > properties: microchip,rmii-clk-internal"?
> 
> If I understood you correctly you are refering to a solution like
> if:
>   properties:
>     compatible:
>       enum:
>         - microchip,ksz8863
>         - microchip,ksz8873
> then:
>   properties:
>     microchip,rmii-clk-internal:
>       $ref: /schemas/types.yaml#/definitions/flag
>       description:
>         Set if the RMII reference clock is provided internally. Otherwise
>         reference clock should be provided externally.
> 
> This was already suggested in v1, but was not a satisfactory solution
> according to Mr. Conor Dooley:

Yeah, we prefer not to have the property definitions inside the
conditionals, but rather constrain or allow/disallow them there.

Cheers,
Conor.

> 
> >> On Tue, 10 Oct 2023 16:25:55 +0100, Conor Dooley wrote:
> >> > On Tue, Oct 10, 2023 at 03:18:54PM +0200, Ante Knezic wrote:
> >> > > Add documentation for selecting reference rmii clock on KSZ88X3 devices
> >> > > 
> >> > > Signed-off-by: Ante Knezic <ante.knezic@...mholz.de>
> >> > > ---
> >> > >  Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml | 6 ++++++
> >> > >  1 file changed, 6 insertions(+)
> >> > > 
> >> > > diff --git a/Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml b/Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml
> >> > > index e51be1ac0362..3df5d2e72dba 100644
> >> > > --- a/Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml
> >> > > +++ b/Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml
> >> > > @@ -49,6 +49,12 @@ properties:
> >> > >        Set if the output SYNCLKO clock should be disabled. Do not mix with
> >> > >        microchip,synclko-125.
> >> > >  
> >> > > +  microchip,rmii-clk-internal:
> >> > > +    $ref: /schemas/types.yaml#/definitions/flag
> >> > > +    description:
> >> > > +      Set if the RMII reference clock should be provided internally.
> >> > 
> >> > > Applies only
> >> > > +      to KSZ88X3 devices.
> >> > 
> >> > This should be enforced by the schema, the example schema in the docs
> >> > should show you how to do this.
> >> 
> >> I am guessing you are refering to limiting the property to ksz88x3 devices?
> >> Something like:
> >> 
> >> if:
> >>   properties:
> >>     compatible:
> >>       enum:
> >>         - microchip,ksz8863
> >>         - microchip,ksz8873
> >> then:
> >>   properties:
> >>     microchip,rmii-clk-internal:
> >>       $ref: /schemas/types.yaml#/definitions/flag
> >>       description:
> >>         Set if the RMII reference clock is provided internally. Otherwise
> >>         reference clock should be provided externally.
> >
> >Not quite. The definition of the property should be outside the if/then,
> >but one should be used to allow/disallow the property.
> 

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