linux-kernel - Re: [PATCH v2 15/20] dt-bindings: nvmem: add YAML schema for the sl28 vpd layout

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Date:   Tue, 13 Sep 2022 16:21:24 +0200
From:   Michael Walle <michael@...le.cc>
To:     Rob Herring <robh@...nel.org>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Frank Rowand <frowand.list@...il.com>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Ahmad Fatoum <a.fatoum@...gutronix.de>,
        Philipp Zabel <p.zabel@...gutronix.de>
Subject: Re: [PATCH v2 15/20] dt-bindings: nvmem: add YAML schema for the sl28
 vpd layout

Am 2022-09-12 21:20, schrieb Rob Herring:

>> +  base-mac-address:
>> +    type: object
>> +    description:
>> +      Base MAC address for all on-module network interfaces. The 
>> first
>> +      argument of the phandle will be treated as an offset.
>> +
>> +    properties:
>> +      "#nvmem-cell-cells":
> 
> You can't just add a new #.*-cells buried in a device binding. I'm fine
> with the concept though having more than 1 user would be nice.

I was under the impression the tooling will handle it, but as you
pointed out below, this isn't the case for a missing default. The
statement above should only be to validate that there is one
additional argument if the base-mac-address node is used in a
phandle.

> Any case that doesn't match foos->#foo-cells or has a default # of
> cells if missing (as this does) has to be added to dtschema to decode 
> it
> properly. It won't really matter until there's a user with 2 or more
> entries. I'm happy to do update the dtschema part, but I'd prefer to 
> see
> the schema in dtschema rather than the kernel.

Ok, but I'm not sure I understand you correctly here. You will
update the dtschema tooling (I guess it's about fixup_phandles() in
dtb.py) and which schema should be in dtschema? nvmem.yaml
and/or nvmem-consumer.yaml? The entire schema or only a
subset of it?

-michael