linux-kernel - RE: [EXT] Re: [PATCH] dt-bindings: spi: Convert Freescale DSPI to json schema

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Date:   Tue, 16 Mar 2021 05:56:02 +0000
From:   Kuldeep Singh <kuldeep.singh@....com>
To:     Pratyush Yadav <p.yadav@...com>
CC:     "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Vladimir Oltean <olteanv@...il.com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>
Subject: RE: [EXT] Re: [PATCH] dt-bindings: spi: Convert Freescale DSPI to
 json schema

> -----Original Message-----
> From: Pratyush Yadav <p.yadav@...com>
> Sent: Tuesday, March 16, 2021 12:01 AM
> To: Kuldeep Singh <kuldeep.singh@....com>
> Cc: linux-spi@...r.kernel.org; devicetree@...r.kernel.org; linux-
> kernel@...r.kernel.org; Mark Brown <broonie@...nel.org>; Rob Herring
> <robh+dt@...nel.org>; Vladimir Oltean <olteanv@...il.com>; linux-
> mtd@...ts.infradead.org
> Subject: [EXT] Re: [PATCH] dt-bindings: spi: Convert Freescale DSPI to json schema
> 
> Caution: EXT Email
> 
> +Cc mtd list
> 
> Hi,
> 
> On 15/03/21 05:45PM, Kuldeep Singh wrote:
> > Convert the Freescale DSPI binding to DT schema format using json-schema.
> >
> > Signed-off-by: Kuldeep Singh <kuldeep.singh@....com>
> > ---
> > Hi Rob,
> > This patch is checked with following commands with no warnings observed.
> > make distclean; make allmodconfig;
> > make dt_binding_check
> > DT_SCHEMA_FILES=Documentation/devicetree/bindings/spi/fsl,spi-fsl-dspi
> > .yaml; make dtbs_check
> > DT_SCHEMA_FILES=Documentation/devicetree/bindings/spi/fsl,spi-fsl-dspi
> > .yaml
> 
> When I add the "fsl,spi-cs-sck-delay" property under the flash@0 node in the
> example and run dt_binding_check, I see the below error:
> 
>   /home/pratyush/src/linux/Documentation/devicetree/bindings/spi/fsl,spi-fsl-
> dspi.example.dt.yaml: flash@0: 'fsl,spi-cs-sck-delay' does not match any of the
> regexes: '^partition@', 'pinctrl-[0-9]+'
>      From schema:
> /home/pratyush/src/lin/Documentation/devicetree/bindings/mtd/jedec,spi-
> nor.yaml

Hi Pratyush,

Thanks for mentioning, I just noticed the same error after adding fsl,spi-cs-sck-delay property.
Since my example is not using the property, the error went unnoticed.

Taking example of nvidia qspi bindings i.e 
https://lore.kernel.org/linux-devicetree/1608585459-17250-3-git-send-email-skomatineni@nvidia.com/

I constructed other properties in similar fashion and later noticed that
example in nvidia bindings uses compatibes as "spi-nor" instead of "jedec,spi-nor"
and therefore passes "make dt_binding_check".

> I am trying to solve a similar problem for the Cadence QSPI controller binding and
> I wonder what the best solution for this is. The obvious one would be to add
> these properties to jedec,spi-nor.yaml. I haven't managed to come up with any
> other solution to this problem.

I agree with the solution to add properties in jedec,spi-nor.yaml and adding properties
particular to specific controllers for flashes in generic jedec,spi-nor.yaml may not be
a good solution though. Please let me know your views.

Other approach is to add these properties in same binding itself (if possible) so as 
to limit the scope of these properties. Looking forward for more suggestions.

Regards
Kuldeep