linux-kernel - Re: [PATCH v3 05/11] spi: dw: Add Pensando Elba SoC SPI Controller bindings

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Date:   Tue, 16 Nov 2021 14:29:07 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Brad Larson <brad@...sando.io>, Rob Herring <robh@...nel.org>
Cc:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Mark Brown <broonie@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Olof Johansson <olof@...om.net>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 05/11] spi: dw: Add Pensando Elba SoC SPI Controller
 bindings

On Mon, Nov 15, 2021 at 02:24:40PM -0800, Brad Larson wrote:
> Hi Sergey,
> 
> On Thu, Oct 28, 2021 at 12:49 AM Serge Semin <fancer.lancer@...il.com> wrote:
> >
> > On Sun, Oct 24, 2021 at 06:51:50PM -0700, Brad Larson wrote:
> > > The Pensando Elba SoC has integrated the DW APB SPI Controller
> >
> > Please add the "dt-bindings: " prefix to the patch name and discard
> > the word "bindings" from the title as the submitting DT-patches
> > requires:
> > Documentation/devicetree/bindings/submitting-patches.rst
> 
> I'll add that.  I recall looking at the recent git log for similar
> changes to the file as the current recommended approach.
> 
> > >
> > > Signed-off-by: Brad Larson <brad@...sando.io>
> > > ---
> > >  Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml | 2 ++
> > >  1 file changed, 2 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml b/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml
> > > index d7e08b03e204..0b5ebb2ae6e7 100644
> > > --- a/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml
> > > +++ b/Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml
> > > @@ -73,6 +73,8 @@ properties:
> > >                - renesas,r9a06g032-spi # RZ/N1D
> > >                - renesas,r9a06g033-spi # RZ/N1S
> > >            - const: renesas,rzn1-spi   # RZ/N1
> >
> > > +      - description: Pensando Elba SoC SPI Controller
> > > +        const: pensando,elba-spi
> >
> > AFAICS from the driver-part of the patchset it's not enough. You've
> > also got the syscon phandle, which needs to be reflected in the
> > bindings. That also makes me thinking that you didn't perform the
> > "dtbs_check" on the dts-files you were going to submit, but for some
> > reason discarded from this series (btw why?). If you did you would
> > have got an error of an unevaluated property detection.
> 
> I ran the checks below and didn't get errors.  Rob provided some info
> and I found the server did not have yamllint installed (not flagged by
> tool).  Also dt-schema was not the latest.  I'm re-doing this and
> including "DT_CHECKER_FLAGS=-m" as that is new with v5.13.
> 

> make ARCH=arm64 dtbs_check
> DT_SCHEMA_FILES=Documentation/devicetree/bindings/mmc/cdns,sdhci.yaml
> make ARCH=arm64 dtbs_check
> DT_SCHEMA_FILES=Documentation/devicetree/bindings/spi/cdns,qspi-nor.yaml
> make ARCH=arm64 dtbs_check
> DT_SCHEMA_FILES=Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml
> make ARCH=arm64 dtbs_check
> DT_SCHEMA_FILES=Documentation/devicetree/bindings/vendor-prefixes.yaml
> make ARCH=arm64 dtbs_check
> DT_SCHEMA_FILES=Documentation/devicetree/bindings/arm/pensando,elba.yaml

Hmm, that's weird. Rob, does dtschema tool have the
"unevaluatedProperties" property support?

Brad, anyway you still need to add the syscon-property (pensando,*spics)
requirement in the snps,dw-apb-ssi.yaml schema. See the way it's done there
for instance for "baikal,bt1-sys-ssi" when it comes to the
vendor-specific properties definition in the allOf composition block.
You'll need to define a custom phandle property there in case if a
DT-node is compatible with you SPI controller.

-Sergey

> 
> make dt_binding_check
> DT_SCHEMA_FILES=Documentation/devicetree/bindings/mmc/cdns,sdhci.yaml
> make dt_binding_check
> DT_SCHEMA_FILES=Documentation/devicetree/bindings/spi/cdns,qspi-nor.yaml
> make dt_binding_check
> DT_SCHEMA_FILES=Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.yaml
> make dt_binding_check
> DT_SCHEMA_FILES=Documentation/devicetree/bindings/vendor-prefixes.yaml
> make dt_binding_check
> DT_SCHEMA_FILES=Documentation/devicetree/bindings/arm/pensando,elba.yaml
> 
> Thanks
> Brad