linux-kernel - Re: [PATCH 07/10] dt-bindings: mtd: Ensure partition node properties are documented

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Message-ID: <87fr8fxipc.fsf@bootlin.com>
Date: Fri, 09 Jan 2026 10:02:07 +0100
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: "Rob Herring (Arm)" <robh@...nel.org>
Cc: Richard Weinberger <richard@....at>,  Vignesh Raghavendra
 <vigneshr@...com>,  Krzysztof Kozlowski <krzk+dt@...nel.org>,  Conor
 Dooley <conor+dt@...nel.org>,  Brian Norris <computersforpeace@...il.com>,
  Kamal Dasu <kdasu.kdev@...il.com>,  William Zhang
 <william.zhang@...adcom.com>,  Nick Terrell <terrelln@...com>,  David
 Sterba <dsterba@...e.com>,  Rafał Miłecki
 <rafal@...ecki.pl>,  Simon Glass
 <sjg@...omium.org>,  Linus Walleij <linusw@...nel.org>,  Ulf Hansson
 <ulf.hansson@...aro.org>,  Marcus Folkesson <marcus.folkesson@...il.com>,
  Tony Lindgren <tony@...mide.com>,  Roger Quadros <rogerq@...nel.org>,
  Hauke Mehrtens <hauke@...ke-m.de>,  linux-mtd@...ts.infradead.org,
  devicetree@...r.kernel.org,  linux-kernel@...r.kernel.org,
  linux-mmc@...r.kernel.org
Subject: Re: [PATCH 07/10] dt-bindings: mtd: Ensure partition node
 properties are documented

Hello Rob,

On 08/01/2026 at 11:53:16 -06, "Rob Herring (Arm)" <robh@...nel.org> wrote:

> Partition nodes without a compatible have no restrictions on additional
> properties. Fix this by ensuring 'unevaluatedProperties' is set when
> there's no compatible property. If there is a compatible property, then
> there should be a specific schema for it which will enforce
> 'unevaluatedProperties'.
>
> Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
> ---

Overall thank you very much for this series, I've been sruggling while
defining these and your approach seems very relevant. I am fine with all
the patches in this series, but will wait a bit for others to make a bit
of feedback.

[...]

> +$defs:
> +  partition-node:
> +    type: object
> +    if:
> +      not:
> +        required: [ compatible ]
> +    then:
> +      $ref: '#'
> +      unevaluatedProperties: false
> +    else:
> +      $ref: '#'

This, however, is total blackmagic to me. Would you mind explaining what

      $ref: '#'

indicates? Is this a placeholder indicating "a reference must be given?

Also I do not understand the final else case, what is it covering?

Thanks for the little explanation (or you can give me a pointer to some
relevant doc I could read).

Thanks,
Miquèl