linux-kernel - Re: [PATCH 1/5] dt-bindings: Powerzone new bindings

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Date:   Thu, 25 Nov 2021 14:26:02 -0700
From:   Rob Herring <robh@...nel.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     Arnd Bergmann <arnd@...db.de>, lukasz.luba@....com,
        ulf.hansson@...aro.org, arnd@...aro.org,
        linux-kernel@...r.kernel.org, heiko@...ech.de,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>, rjw@...ysocki.net
Subject: Re: [PATCH 1/5] dt-bindings: Powerzone new bindings

On Wed, 24 Nov 2021 13:55:00 +0100, Daniel Lezcano wrote:
> The proposed bindings are describing a set of powerzones.
> 
> A power zone is the logical name for a component which is capable of
> power capping and where we can measure the power consumption.
> 
> A power zone can aggregate several power zones in terms of power
> measurement and power limitations. That allows to apply power
> constraint to a group of components and let the system balance the
> allocated power in order to comply with the constraint.
> 
> The ARM System Control and Management Interface (SCMI) can provide a
> power zone description.
> 
> The powerzone semantic is also found on the Intel platform with the
> RAPL register.
> 
> The Linux kernel powercap framework deals with the powerzones:
> 
> https://www.kernel.org/doc/html/latest/power/powercap/powercap.html
> 
> The powerzone can also represent a group of children powerzones, hence
> the description can result on a hierarchy. Such hierarchy already
> exists with the hardware or can be represented an computed from the
> kernel.
> 
> The hierarchical description was initially proposed but not desired
> given there are other descriptions like the power domain proposing
> almost the same description.
> 
> https://lore.kernel.org/all/CAL_JsqLuLcHj7525tTUmh7pLqe7T2j6UcznyhV7joS8ipyb_VQ@mail.gmail.com/
> 
> The description gives the power constraint dependencies to apply on a
> specific group of logically or physically aggregated devices. They do
> not represent the physical location or the power domains of the SoC
> even if the description could be similar.
> 
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Ulf Hansson <ulf.hansson@...aro.org>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> ---
>  .../devicetree/bindings/power/powerzones.yaml | 95 +++++++++++++++++++
>  1 file changed, 95 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/power/powerzones.yaml
> 

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/linux-dt-review/Documentation/devicetree/bindings/power/powerzones.yaml: 'additionalProperties' is a required property
	hint: A schema without a "$ref" to another schema must define all properties and use "additionalProperties"
	from schema $id: http://devicetree.org/meta-schemas/base.yaml#
/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/power/powerzones.yaml: ignoring, error in schema: 
warning: no schema found in file: ./Documentation/devicetree/bindings/power/powerzones.yaml

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/patch/1559118

This check can fail if there are any dependencies. The base for a patch
series is generally the most recent rc1.

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.