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@quicinc.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@ae94400: 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.