linux-kernel - Re: [PATCH RFC 01/15] dt-bindings: mfd: Split out Qcom RPM MSG RAM

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Date:   Fri, 10 Mar 2023 21:01:27 -0600
From:   Rob Herring <robh@...nel.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Gross <agross@...nel.org>, linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, Lee Jones <lee@...nel.org>,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH RFC 01/15] dt-bindings: mfd: Split out Qcom RPM MSG RAM


On Sat, 11 Mar 2023 02:21:31 +0100, Konrad Dybcio wrote:
> The RPM Message RAM is a part of the RPM low-power core's RAM that's a
> MMIO-mapped region from the main ARM CPUs' POV. It contains sleep stats
> divided per "RPM master" (ARM cluster, *DSP, ...), an interrupt controller
> (MPM) that's vital in the low-power mode entry/exit sequence, as it
> signals the readiness to enter sleep, replays the interrupts after a total
> power collapse recovery and is able to receive external interrupts from
> other IPs (like the PMIC, TSENS and USB) on the SoC to initiate a wakeup
> sequence.
> 
> On top of that, it contains some regions that are (ab)used by SMEM (by
> design!), but we're not completely sure what ranges are r/w to/from.
> This would probably need to be determined on a SoC-by-SoC - or even worse
> - firmware-by-firmware basis, but since this region is quite "wild west"
> by design (it may be accessed and altered in one form or another by all of
> the subsystems at the same time) this shouldn't really worry us..
> 
> Split out the bindings and re-model it as a simple-mfd to allow for better
> representation of the partitions within and allow child devices (MPM,
> master sleep stats - coming soon).
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
> ---
>  .../devicetree/bindings/mfd/qcom,rpm-msg-ram.yaml  | 82 ++++++++++++++++++++++
>  Documentation/devicetree/bindings/sram/sram.yaml   |  2 -
>  2 files changed, 82 insertions(+), 2 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:
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/soc/qcom/qcom,smem.example.dtb: sram@...28000: compatible: ['qcom,rpm-msg-ram'] is too short
	From schema: /builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/mfd/qcom,rpm-msg-ram.yaml
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/mfd/qcom,rpm-msg-ram.example.dtb: sram@...0000: interrupt-controller@1b8: 'oneOf' conditional failed, one must be fixed:
	'#power-domain-cells' does not match any of the regexes: 'pinctrl-[0-9]+'
	From schema: /builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/mfd/qcom,rpm-msg-ram.yaml
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/mfd/qcom,rpm-msg-ram.example.dtb: interrupt-controller@1b8: '#power-domain-cells' does not match any of the regexes: 'pinctrl-[0-9]+'
	From schema: /builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/interrupt-controller/qcom,mpm.yaml

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20230311-topic-msg_ram-v1-1-e9c2094daf09@linaro.org

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.