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

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Message-ID: <20230621205317.GA3493078-robh@kernel.org>
Date:   Wed, 21 Jun 2023 14:53:17 -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 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.

> So at least in my bubble the general
> hint is to *always* quote strings. Note that required: true is also the
> default for yamllint's quoted-strings setting, proably for pitfalls like
> these.

We're so far gone the other direction from quoting everything, that's 
not going to happen. Plus, if I liked everything quoted, I would have 
used JSON.

My preference here is I don't want to care about this in reviews. I want 
yamllint to check it and not have to think about it again.

Rob