linux-kernel - Re: [PATCH 05/14] dt-bindings: remoteproc: Add Qualcomm RPM processor/subsystem

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Message-ID: <ZH2n_tsf2MsIQ6Vf@gerhold.net>
Date:   Mon, 5 Jun 2023 11:16:46 +0200
From:   Stephan Gerhold <stephan@...hold.net>
To:     Rob Herring <robh@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bjorn Andersson <andersson@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Andy Gross <agross@...nel.org>,
        linux-remoteproc@...r.kernel.org
Subject: Re: [PATCH 05/14] dt-bindings: remoteproc: Add Qualcomm RPM
 processor/subsystem

On Mon, Jun 05, 2023 at 02:33:58AM -0600, Rob Herring wrote:
> On Mon, 05 Jun 2023 09:08:21 +0200, Stephan Gerhold wrote:
> > On Qualcomm platforms, most subsystems (e.g. audio/modem DSP) are
> > described as remote processors in the device tree, with a dedicated
> > node where properties and services related to them can be described.
> > 
> > The Resource Power Manager (RPM) is also such a subsystem, with a
> > remote processor that is running a special firmware. Unfortunately,
> > the RPM never got a dedicated node representing it properly in the
> > device tree. Most of the RPM services are described below a top-level
> > /smd or /rpm-glink node.
> > 
> > However, SMD/GLINK is just one of the communication channels to the RPM
> > firmware. For example, the MPM interrupt functionality provided by the
> > RPM does not use SMD/GLINK but writes directly to a special memory
> > region allocated by the RPM firmware in combination with a mailbox.
> > Currently there is no good place in the device tree to describe this
> > functionality. It doesn't belong below SMD/GLINK but it's not an
> > independent top-level device either.
> > 
> > Introduce a new "qcom,rpm-proc" compatible that allows describing the
> > RPM as a remote processor/subsystem like all others. The SMD/GLINK node
> > is moved to a "smd-edge"/"glink-edge" subnode consistent with other
> > existing bindings. Additional subnodes (e.g. interrupt-controller for
> > MPM, rpm-master-stats) can be also added there.
> > 
> > Signed-off-by: Stephan Gerhold <stephan@...hold.net>
> > ---
> >  .../bindings/remoteproc/qcom,rpm-proc.yaml         | 125 +++++++++++++++++++++
> >  1 file changed, 125 insertions(+)
> > 
> 
> 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/remoteproc/qcom,rpm-proc.yaml: Unable to find schema file matching $id: http://devicetree.org/schemas/soc/qcom/qcom,rpm-master-stats.yaml
> 

I think we can ignore this error: The qcom,rpm-master-stats.yaml schema
exists only in the qcom for-next branch at the moment, which is what
this series targets. The base-commit in the cover letter also points
there (although I guess it might be tricky to resolve it reliably for
automated testing).

Before sending this series I verified that there are no dt_binding_check
and dtbs_check warnings or errors when applied to the correct branch.

Thanks,
Stephan