linux-kernel - Re: [PATCH] dt-bindings: clock: ti: Convert interface.txt to json-schema

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Date:   Sun, 3 Dec 2023 23:46:45 +0100
From:   Andreas Kemnade <andreas@...nade.info>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     mturquette@...libre.com, sboyd@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        kristo@...nel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: clock: ti: Convert interface.txt to
 json-schema

On Fri, 1 Dec 2023 15:45:06 +0100
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:

> On 01/12/2023 15:41, Andreas Kemnade wrote:
> > On Fri, 1 Dec 2023 15:17:46 +0100
> > Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:
> >   
> >> On 01/12/2023 15:09, Andreas Kemnade wrote:  
> >>> Am Wed, 29 Nov 2023 09:15:57 +0100
> >>> schrieb Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>:
> >>>     
> >>>> On 28/11/2023 21:41, Andreas Kemnade wrote:    
> >>>>> Am Tue, 28 Nov 2023 09:41:23 +0100
> >>>>> schrieb Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>:      
> >>>>>>> If the interface clock is not below a ti,clksel then we have reg.
> >>>>>>>        
> >>>>>>
> >>>>>> This should be expressed in the bindings. It's fine to make the reg
> >>>>>> optional (skip the description, it's confusing), but the ti,clksel
> >>>>>> should reference this schema and enforce it on the children.
> >>>>>>      
> >>>>> Well there are other compatibles below ti,clksel, too, so should we
> >>>>> rather add them when the other .txt files are converted?      
> >>>>
> >>>> This binding should already be referenced by ti,clksel. When the other
> >>>> are ready, you will change additionalProperties from object to false.
> >>>>    
> >>> I played around with it:
> >>>
> >>> --- a/Documentation/devicetree/bindings/clock/ti/ti,clksel.yaml
> >>> +++ b/Documentation/devicetree/bindings/clock/ti/ti,clksel.yaml
> >>> @@ -33,6 +33,11 @@ properties:
> >>>      const: 2
> >>>      description: The CLKSEL register and bit offset
> >>>  
> >>> +patternProperties:
> >>> +  "-ick$":
> >>> +    $ref: /schemas/clock/ti/ti,interface-clock.yaml#
> >>> +    type: object
> >>> +
> >>>  required:
> >>>    - compatible
> >>>    - reg
> >>>
> >>>  
> >>> That generates warnings, which look more serious than just a
> >>> non-converted compatible, so lowering the overall "signal-noise-ratio".
> >>>
> >>> e.g.
> >>> from schema $id:
> >>> http://devicetree.org/schemas/clock/ti/ti,clksel.yaml#
> >>> /home/andi/linux-dtbs/arch/arm/boot/dts/ti/omap/omap3-overo-tobiduo.dtb:
> >>> clock@c40: clock-rm-ick: 'ti,index-starts-at-one', 'ti,max-div' do not
> >>> match any of the regexes: 'pinctrl-[0-9]+'
> >>>
> >>> I think we should rather postpone such referencing.    
> >>
> >> Are you sure in such case that your binding is correct? The warnings
> >> suggest that not, therefore please do not postpone.
> >>  
> > well, there is not only stuff from clock/ti/ti,interface.yaml but also from
> > clock/ti/divider.txt below ti,clksel. So I have one warning about the missing
> > compatible there and also about the properties belonging to that compatible.  
> 
> Ah, you have other bindings for the "-ick" nodes? Then you cannot match
> by pattern now, indeed. Maybe skipping ref but adding "compatible" into
> node, like we do for Qualcomm mdss bindings, would work. But in general
> all these should be converted at the same time.
> 
Yes, there are other bindings for the "-ick" nodes. But these bindings
are not exclusive to the "-ick" nodes. I personally would prefer not
having to do the whole clock/ti/*.txt directory at once.

Regards,
Andreas