linux-kernel - Re: [PATCH v2 05/12] dt-bindings: remoteproc: Add Qualcomm RPM processor/subsystem

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Message-Id: <168621284569.1409937.7016655911882350618.robh@kernel.org>
Date:   Thu, 08 Jun 2023 02:27:25 -0600
From:   Rob Herring <robh@...nel.org>
To:     Stephan Gerhold <stephan@...hold.net>
Cc:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-remoteproc@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        linux-arm-msm@...r.kernel.org, Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v2 05/12] dt-bindings: remoteproc: Add Qualcomm RPM
 processor/subsystem


On Thu, 08 Jun 2023 09:10:25 +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.
> 
> Deprecate using the old top-level /smd node since all SMD edges
> are now specified as subnodes of the remote processor.
> 
> Signed-off-by: Stephan Gerhold <stephan@...hold.net>
> ---
> This patch is based on qcom/for-next, since it needs the new
> qcom,rpm-master-stats.yaml schema that is only applied there.
> ---
>  .../bindings/remoteproc/qcom,rpm-proc.yaml         | 171 +++++++++++++++++++++
>  .../devicetree/bindings/soc/qcom/qcom,smd-rpm.yaml |   6 +-
>  .../devicetree/bindings/soc/qcom/qcom,smd.yaml     |   7 +
>  3 files changed, 181 insertions(+), 3 deletions(-)
> 

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

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20230531-rpm-rproc-v2-5-56a4a00c8260@gerhold.net

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.