linux-kernel - Re: [v3 1/3] dt-bindings: msm/dsi: Add 10nm dsi phy tuning properties

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Date:   Tue, 18 Jan 2022 20:55:53 -0600
From:   Rob Herring <robh@...nel.org>
To:     Rajeev Nandan <quic_rajeevny@...cinc.com>
Cc:     jonathan@...ek.ca, freedreno@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, robdclark@...il.com,
        airlied@...ux.ie, dmitry.baryshkov@...aro.org, swboyd@...omium.org,
        devicetree@...r.kernel.org, robh+dt@...nel.org,
        quic_abhinavk@...cinc.com, quic_kalyant@...cinc.com,
        dri-devel@...ts.freedesktop.org, daniel@...ll.ch,
        quic_mkrishn@...cinc.com, sean@...rly.run,
        linux-kernel@...r.kernel.org
Subject: Re: [v3 1/3] dt-bindings: msm/dsi: Add 10nm dsi phy tuning properties

On Wed, 19 Jan 2022 02:08:38 +0530, Rajeev Nandan wrote:
> In most cases, the default values of DSI PHY tuning registers should be
> sufficient as they are fully optimized. However, in some cases where
> extreme board parasitics cause the eye shape to degrade, the override
> bits can be used to improve the signal quality.
> 
> The general guidelines for DSI PHY tuning include:
> - High and moderate data rates may benefit from the drive strength and
>   drive level tuning.
> - Drive strength tuning will affect the output impedance and may be used
>   for matching optimization.
> - Drive level tuning will affect the output levels without affecting the
>   impedance.
> 
> The clock and data lanes have a calibration circuitry feature. The drive
> strength tuning can be done by adjusting rescode offset for hstop/hsbot,
> and the drive level tuning can be done by adjusting the LDO output level
> for the HSTX drive.
> 
> Signed-off-by: Rajeev Nandan <quic_rajeevny@...cinc.com>
> ---
> 
> Changes in v2:
>  - More details in the commit text (Stephen Boyd)
>  - Use human understandable values (Stephen Boyd, Dmitry Baryshkov)
>  - Do not take values that are going to be unused (Dmitry Baryshkov)
> 
> Changes in v3:
>  - Use "qcom," prefix (Dmitry Baryshkov)
>  - Remove encoding from phy-drive-ldo-level (Dmitry Baryshkov)
>  - Use negative values instead of two's complement (Dmitry, Rob Herring)
> 
> 
>  .../bindings/display/msm/dsi-phy-10nm.yaml         | 34 ++++++++++++++++++++++
>  1 file changed, 34 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:
/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/display/msm/dsi-phy-10nm.yaml: properties:qcom,phy-rescode-offset-bot: 'minimum' should not be valid under {'enum': ['const', 'enum', 'exclusiveMaximum', 'exclusiveMinimum', 'minimum', 'maximum', 'multipleOf', 'pattern']}
	hint: Scalar and array keywords cannot be mixed
	from schema $id: http://devicetree.org/meta-schemas/keywords.yaml#
/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/display/msm/dsi-phy-10nm.yaml: properties:qcom,phy-rescode-offset-bot: 'maximum' should not be valid under {'enum': ['const', 'enum', 'exclusiveMaximum', 'exclusiveMinimum', 'minimum', 'maximum', 'multipleOf', 'pattern']}
	hint: Scalar and array keywords cannot be mixed
	from schema $id: http://devicetree.org/meta-schemas/keywords.yaml#
/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/display/msm/dsi-phy-10nm.yaml: properties:qcom,phy-rescode-offset-bot: 'minimum' should not be valid under {'enum': ['const', 'enum', 'exclusiveMaximum', 'exclusiveMinimum', 'minimum', 'maximum', 'multipleOf', 'pattern']}
	hint: Scalar and array keywords cannot be mixed
	from schema $id: http://devicetree.org/meta-schemas/keywords.yaml#
/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/display/msm/dsi-phy-10nm.yaml: properties:qcom,phy-rescode-offset-bot: 'maximum' should not be valid under {'enum': ['const', 'enum', 'exclusiveMaximum', 'exclusiveMinimum', 'minimum', 'maximum', 'multipleOf', 'pattern']}
	hint: Scalar and array keywords cannot be mixed
	from schema $id: http://devicetree.org/meta-schemas/keywords.yaml#
/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/display/msm/dsi-phy-10nm.yaml: properties:qcom,phy-rescode-offset-top: 'minimum' should not be valid under {'enum': ['const', 'enum', 'exclusiveMaximum', 'exclusiveMinimum', 'minimum', 'maximum', 'multipleOf', 'pattern']}
	hint: Scalar and array keywords cannot be mixed
	from schema $id: http://devicetree.org/meta-schemas/keywords.yaml#
/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/display/msm/dsi-phy-10nm.yaml: properties:qcom,phy-rescode-offset-top: 'maximum' should not be valid under {'enum': ['const', 'enum', 'exclusiveMaximum', 'exclusiveMinimum', 'minimum', 'maximum', 'multipleOf', 'pattern']}
	hint: Scalar and array keywords cannot be mixed
	from schema $id: http://devicetree.org/meta-schemas/keywords.yaml#
/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/display/msm/dsi-phy-10nm.yaml: properties:qcom,phy-rescode-offset-top: 'minimum' should not be valid under {'enum': ['const', 'enum', 'exclusiveMaximum', 'exclusiveMinimum', 'minimum', 'maximum', 'multipleOf', 'pattern']}
	hint: Scalar and array keywords cannot be mixed
	from schema $id: http://devicetree.org/meta-schemas/keywords.yaml#
/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/display/msm/dsi-phy-10nm.yaml: properties:qcom,phy-rescode-offset-top: 'maximum' should not be valid under {'enum': ['const', 'enum', 'exclusiveMaximum', 'exclusiveMinimum', 'minimum', 'maximum', 'multipleOf', 'pattern']}
	hint: Scalar and array keywords cannot be mixed
	from schema $id: http://devicetree.org/meta-schemas/keywords.yaml#
/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/display/msm/dsi-phy-10nm.yaml: ignoring, error in schema: properties: qcom,phy-rescode-offset-bot
Documentation/devicetree/bindings/display/msm/dsi-phy-10nm.example.dt.yaml:0:0: /example-0/dsi-phy@...4400: failed to match any schema with compatible: ['qcom,dsi-phy-10nm']

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/patch/1581518

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.