netdev - Re: [PATCH 2/5] dt-bindings: nvmem: add YAML schema for the ONIE tlv layout

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Date:   Fri, 4 Nov 2022 11:56:03 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Paolo Abeni <pabeni@...hat.com>,
        Robert Marko <robert.marko@...tura.hr>,
        Michael Walle <michael@...le.cc>, devicetree@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        "David S. Miller" <davem@...emloft.net>,
        Russell King <linux@...linux.org.uk>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Maxime Chevallier <maxime.chevallier@...tlin.com>,
        linux-kernel@...r.kernel.org, Marcin Wojtas <mw@...ihalf.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        netdev@...r.kernel.org
Subject: Re: [PATCH 2/5] dt-bindings: nvmem: add YAML schema for the ONIE
 tlv layout

Hi Rob,

robh@...nel.org wrote on Fri, 28 Oct 2022 16:35:56 -0500:

> On Fri, Oct 28, 2022 at 03:44:31PM +0200, Miquel Raynal wrote:
> > Hi Rob & Krzysztof,
> > 
> > robh@...nel.org wrote on Fri, 28 Oct 2022 07:20:05 -0500:
> >   
> > > On Fri, 28 Oct 2022 11:23:34 +0200, Miquel Raynal wrote:  
> > > > Add a schema for the ONIE tlv NVMEM layout that can be found on any ONIE
> > > > compatible networking device.
> > > > 
> > > > Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> > > > ---
> > > >  .../nvmem/layouts/onie,tlv-layout.yaml        | 96 +++++++++++++++++++
> > > >  1 file changed, 96 insertions(+)
> > > >  create mode 100644 Documentation/devicetree/bindings/nvmem/layouts/onie,tlv-layout.yaml
> > > >     
> > > 
> > > My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
> > > on your patch (DT_CHECKER_FLAGS is new in v5.13):
> > > 
> > > yamllint warnings/errors:
> > > 
> > > dtschema/dtc warnings/errors:
> > > Documentation/devicetree/bindings/nvmem/layouts/onie,tlv-layout.example.dtb:0:0: /example-0/onie: failed to match any schema with compatible: ['onie,tlv-layout', 'vendor,device']  
> > 
> > Oh right, I wanted to ask about this under the three --- but I forgot.
> > Here was my question:
> > 
> > How do we make the checker happy with an example where the second
> > compatible can be almost anything (any nvmem-compatible device) but the
> > first one should be the layout? (this is currently what Michael's
> > proposal uses).  
> 
> That seems like mixing 2 different meanings for compatibles. Perhaps 
> that should be split with the nvmem stuff going into a child container 
> node.
> 
> Rob
> 
> P.S. Any compatible string starting with 'foo' will pass, but I probably 
> won't be happy to see that used.

Ok, I've scratched my forehead a little bit and came with something (I
hope) better. I've taken over the binding patches from Michael's
original series to show how they conform with my changes. Basically
I've introduced an nvmem-layout container node which will improve a lot
the description without mixing everything. More details in the upcoming
series.

Thanks, Miquèl