linux-kernel - Re: [PATCH v2 1/4] ASoC: dt-bindings: stm32: i2s: add audio-graph-card port

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Message-ID: <CAL_Jsq+ZVU=DR0vXq6YOsrK9-MoUp5DJ6RKHmtL-ZGSxQ7qyJQ@mail.gmail.com>
Date:   Sat, 11 Dec 2021 14:05:15 -0600
From:   Rob Herring <robh@...nel.org>
To:     Alexandre TORGUE <alexandre.torgue@...s.st.com>
Cc:     Olivier MOYSAN <olivier.moysan@...s.st.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Olivier Moysan <olivier.moysan@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Fabrice Gasnier <fabrice.gasnier@...s.st.com>,
        Alain Volmat <alain.volmat@...s.st.com>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        Amelie Delaunay <amelie.delaunay@...s.st.com>,
        "moderated list:ARM/STM32 ARCHITECTURE" 
        <linux-stm32@...md-mailman.stormreply.com>,
        Mark Brown <broonie@...nel.org>, devicetree@...r.kernel.org,
        Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 1/4] ASoC: dt-bindings: stm32: i2s: add
 audio-graph-card port

On Tue, Dec 7, 2021 at 7:52 AM Alexandre TORGUE
<alexandre.torgue@...s.st.com> wrote:
>
> Hi Rob
>
> On 12/1/21 11:34 PM, Rob Herring wrote:
> > On Fri, Nov 26, 2021 at 11:25:27AM +0100, Olivier MOYSAN wrote:
> >> Hi Rob,
> >>
> >> On 11/25/21 10:26 PM, Rob Herring wrote:
> >>> On Thu, 25 Nov 2021 15:40:50 +0100, Olivier Moysan wrote:
> >>>> The STM2 I2S DAI can be connected via the audio-graph-card.
> >>>> Add port entry into the bindings.
> >>>>
> >>>> Signed-off-by: Olivier Moysan <olivier.moysan@...s.st.com>
> >>>> ---
> >>>>    Documentation/devicetree/bindings/sound/st,stm32-i2s.yaml | 5 +++++
> >>>>    1 file changed, 5 insertions(+)
> >>>>
> >>>
> >>> 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/1559750
> >>>
> >>>
> >>> audio-controller@...0b000: 'port' does not match any of the regexes: '^port@[0-9]', 'pinctrl-[0-9]+'
> >>>     arch/arm/boot/dts/stm32mp157a-dk1.dt.yaml
> >>>     arch/arm/boot/dts/stm32mp157c-dk2.dt.yaml
> >>>
> >>
> >> This warning is not a new one.
> >>
> >> The i2s2 node in stm32mp15xx-dkx.dtsi would require the following binding:
> >> port:
> >>      $ref: audio-graph-port.yaml#
> >>      unevaluatedProperties: false
> >>
> >> However the spi binding requires to introduce a unit address:
> >> patternProperties:
> >>    '^port@[0-9]':
> >>      $ref: audio-graph-port.yaml#
> >>      unevaluatedProperties: false
> >>
> >> The warning can be removed by re-ordering the bindings patches in the serie,
> >> as "additionalProperties: true" makes the check more tolerant on extra
> >> properties.
> >
> > That's never right.
> >
> >> The patch "ASoC: dt-bindings: stm32: i2s: add audio-graph-card port" can
> >> even be merely dropped.
> >> So, I suggest to resend the serie without audio-graph-card patch.
> >
> > Only if you aren't using audio-graph-card.
> >
> >>
> >> Does it sound too permissive to you ?
> >
> > I think perhaps you need to combine the schemas into 1. Or you need to
> > restructure your dtsi files such that you only add spi specific
> > properties when spi mode is enabled and only add i2s specific properties
> > when i2s mode is enabled. Or use the /delete-property/ directive.
>
> Initially the aim of this series was to fix a "make W=1" warnings seen
> on spi and i2s nodes (duplicate unit-address). Moving both nodes in a
> common node + using a different compatible depending on SPI or I2S usage
> sounded good) but it is not enough. In this series the common node is
> named as following: "spi2s2: spi@...0b000". It is fine for a spi usage
> but if we want to use this "common node" with I2S compatible and
> specific bindings, the node name remains spi@... and then specific spi
> checks are done. For this with this series applied we got this issue
> reported by spi-controller.yaml:
>
> spi@...0b000: port@0: 'compatible' is a required property
>
> So, if we use two separates nodes we got W=1 warning and if we use a
> common node we got yaml check issue. One possibility would be to use a
> common node with a new node name (for example i2spi@...) but I think it
> is not acceptable.

It is acceptable, see this thread[1].

Rob

[1] https://lore.kernel.org/all/20211203183517.11390-1-semen.protsenko@linaro.org/