linux-kernel - Re: [PATCH] dt-bindings: pwm: drop unneeded quotes

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Date:   Wed, 21 Jun 2023 15:58:26 -0600
From:   Rob Herring <robh@...nel.org>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Anson Huang <anson.huang@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-pwm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: pwm: drop unneeded quotes

On Wed, Jun 21, 2023 at 02:53:17PM -0600, Rob Herring wrote:
> On Mon, Jun 12, 2023 at 11:33:15AM +0200, Uwe Kleine-König wrote:
> > Hello,
> > 
> > On Fri, Jun 09, 2023 at 04:07:09PM +0200, Krzysztof Kozlowski wrote:
> > > Cleanup bindings dropping unneeded quotes. Once all these are fixed,
> > > checking for this can be enabled in yamllint.
> > 
> > in my book quoting everything instead of dropping quotes is the better
> > option. While that policy adds more quotes, it prevents surprises like:
> > 
> > 	$ yaml2json << EOF
> > 	> countrycodes:
> > 	>  - de
> > 	>  - fr
> > 	>  - no
> > 	>  - pl
> > 	> EOF
> > 	{
> > 	  "countrycodes": [
> > 	    "de",
> > 	    "fr",
> > 	    false,
> > 	    "pl"
> > 	  ]
> > 	}
> > 
> > And if you use the "only-when-needed" rule of yamllint you have to write
> > the above list as:
> > 
> > 	countrycodes:
> > 	 - de
> > 	 - fr
> > 	 - "no"
> > 	 - pl
> > 
> > which is IMHO really ugly.
> 
> Agreed, but "no" and "yes" are unlikely values in DT.
> 
> > 
> > Another culprit is "on" (which is used e.g. in github action workflows),
> > so yamllint tells for example for
> > https://github.com/pengutronix/microcom/blob/main/.github/workflows/build.yml:
> > 
> > 	  3:1       warning  truthy value should be one of [false, true]  (truthy)
> > 
> > and there are still more surprises (e.g. version numbers might be
> > subject to conversion to float).
> 
> I'll add a meta-schema check for this. 'const' is already limited to 
> string or integer. That's missing from 'enum'. I think we can also check 
> that all items are the same type as well.

And of course, like every meta-schema addition, we find new errors in 
schemas:

/home/rob/proj/linux-dt/Documentation/devicetree/bindings/phy/brcm,brcmstb-usb-phy.yaml: allOf:0:if:properties:compatible:contains:enum: 'oneOf' conditional failed, one must be fixed:
        {'const': 'brcm,bcm4908-usb-phy'} is not of type 'integer'
        {'const': 'brcm,bcm4908-usb-phy'} is not of type 'string'
        {'const': 'brcm,brcmstb-usb-phy'} is not of type 'integer'
        {'const': 'brcm,brcmstb-usb-phy'} is not of type 'string'
        hint: "enum" must be an array with the same type for all items
        from schema $id: http://devicetree.org/meta-schemas/core.yaml#
/home/rob/proj/linux-dt/Documentation/devicetree/bindings/sound/microchip,sama7g5-pdmc.yaml: properties:microchip,mic-pos:items: 'oneOf' conditional failed, one must be fixed:
        {'items': [{'description': 'value for DS line'}, {'description': 'value for sampling edge'}], 'anyOf': [{'enum': [[0, 0], [0, 1], [1, 0], [1, 1]]}]} is not of type 'array'
        /home/rob/proj/linux-dt/Documentation/devicetree/bindings/sound/microchip,sama7g5-pdmc.yaml: properties:microchip,mic-pos:items:anyOf:0:enum: 'oneOf' conditional failed, one must be fixed:
                [0, 0] is not of type 'integer'
                [0, 0] is not of type 'string'
                [0, 1] is not of type 'integer'
                [0, 1] is not of type 'string'
                [1, 0] is not of type 'integer'
                [1, 0] is not of type 'string'
                [1, 1] is not of type 'integer'
                [1, 1] is not of type 'string'
                hint: "enum" must be an array with the same type for all items
                from schema $id: http://devicetree.org/meta-schemas/core.yaml#
        from schema $id: http://devicetree.org/meta-schemas/core.yaml#
/home/rob/proj/linux-dt/Documentation/devicetree/bindings/net/altr,tse.yaml: allOf:1:if:properties:compatible:contains:enum: 'oneOf' conditional failed, one must be fixed:
        {'const': 'altr,tse-1.0'} is not of type 'integer'
        {'const': 'altr,tse-1.0'} is not of type 'string'
        {'const': 'ALTR,tse-1.0'} is not of type 'integer'
        {'const': 'ALTR,tse-1.0'} is not of type 'string'
        hint: "enum" must be an array with the same type for all items
        from schema $id: http://devicetree.org/meta-schemas/core.yaml#