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Date:   Tue, 28 Jun 2022 15:16:38 -0600
From:   Rob Herring <robh@kernel.org>
To:     Kavyasree.Kotagiri@microchip.com
Cc:     Nicolas.Ferre@microchip.com, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        krzysztof.kozlowski+dt@linaro.org, Claudiu.Beznea@microchip.com,
        krzysztof.kozlowski@linaro.org, UNGLinuxDriver@microchip.com
Subject: Re: [PATCH v4 1/3] dt-bindings: mfd: atmel,flexcom: Convert to
 json-schema
Message-ID: <20220628211638.GC963202-robh@kernel.org>
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On Mon, Jun 20, 2022 at 11:45:31AM +0000, Kavyasree.Kotagiri@microchip.com wrote:
> > > Convert the Atmel flexcom device tree bindings to json schema.
> > >
> > > Signed-off-by: Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com>
> > > ---
> > > v3 -> v4:
> > >  - Corrected format of enum used for compatible string.
> > >
> > > v2 -> v3:
> > >  - used enum for compatible string.
> > >  - changed irq flag to IRQ_TYPE_LEVEL_HIGH in example.
> > >  - fixed dtschema errors.
> > >
> > > v1 -> v2:
> > >  - Fix title.
> > >
> > >  .../bindings/mfd/atmel,flexcom.yaml           | 104 ++++++++++++++++++
> > >  .../devicetree/bindings/mfd/atmel-flexcom.txt |  63 -----------
> > >  2 files changed, 104 insertions(+), 63 deletions(-)
> > >  create mode 100644
> > Documentation/devicetree/bindings/mfd/atmel,flexcom.yaml
> > >  delete mode 100644 Documentation/devicetree/bindings/mfd/atmel-
> > flexcom.txt
> > >
> > 
> > Running 'make dtbs_check' with the schema in this patch gives the
> > following warnings. Consider if they are expected or the schema is
> > incorrect. These may not be new warnings.
> > 
> > Note that it is not yet a requirement to have 0 warnings for dtbs_check.
> > This will change in the future.
> > 
> > Full log is available here: https://patchwork.ozlabs.org/patch/
> > 
> > 
> > flexcom@f0000000: spi@400:compatible:0: 'atmel,at91rm9200-spi' was
> > expected
> >         arch/arm/boot/dts/at91-sam9x60ek.dtb
> > 
> > flexcom@f0000000: spi@400:compatible: ['microchip,sam9x60-spi',
> > 'atmel,at91rm9200-spi'] is too long
> >         arch/arm/boot/dts/at91-sam9x60ek.dtb
> 
> These errors are expected because "microchip,sam9x60-spi" and "atmel,at91rm9200-spi"
> are documented in Documentation/devicetree/bindings/spi/spi_atmel.txt.
> which I added in description as
> " description: See ../spi/spi_atmel.txt for details of SPI bindings."

If that was still true, there would not be a warning because .txt files 
don't cause warnings. You've defined the SPI compatible here and that 
doesn't agree with the dts files. One of them is wrong.

Normally, child nodes either just reference another schema or document 
everything locally. You've done a mixture which is not right. Presumably 
that was to avoid 'undocumented compatible' warnings. To fix that you 
either need to convert the SPI binding or don't use it in the example.

Rob