Re: [v4 1/3] dt-bindings: phy: qcom,usb-snps-femto-v2: Add phy override params bindings

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On 11/05/2022 17:26, Krishna Kurapati wrote:
> From: Sandeep Maheswaram <quic_c_sanm@xxxxxxxxxxx>
> 
> Add device tree bindings for SNPS phy tuning parameters.
> 
> Signed-off-by: Sandeep Maheswaram <quic_c_sanm@xxxxxxxxxxx>
> Signed-off-by: Krishna Kurapati <quic_kriskura@xxxxxxxxxxx>
> ---
>  .../bindings/phy/qcom,usb-snps-femto-v2.yaml       | 87 ++++++++++++++++++++++
>  1 file changed, 87 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/phy/qcom,usb-snps-femto-v2.yaml b/Documentation/devicetree/bindings/phy/qcom,usb-snps-femto-v2.yaml
> index 1ce251d..70efffe 100644
> --- a/Documentation/devicetree/bindings/phy/qcom,usb-snps-femto-v2.yaml
> +++ b/Documentation/devicetree/bindings/phy/qcom,usb-snps-femto-v2.yaml
> @@ -53,6 +53,93 @@ properties:
>    vdda33-supply:
>      description: phandle to the regulator 3.3V supply node.
>  
> +  qcom,hs-disconnect-bps:
> +    $ref: /schemas/types.yaml#/definitions/int32
> +    description:
> +      This adjusts the voltage level for the threshold used to
> +      detect a disconnect event at the host. Possible values are.
> +      The values defined are in multiples of basis points (1bp = 0.01%).

This means there is some minimum and maximum (100%)?

> +      The hardware accepts only discrete values. The value closest to the
> +      provided input will be chosen as the override value for this param.
> +
> +  qcom,squelch-detector-bps:
> +    $ref: /schemas/types.yaml#/definitions/int32
> +    description:
> +      This adjusts the voltage level for the threshold used to
> +      detect valid high-speed data.
> +      The values defined are in multiples of basis points (1bp = 0.01%).
> +      The hardware accepts only discrete values. The value closest to the
> +      provided input will be chosen as the override value for this param.
> +
> +  qcom,hs-amplitude-bps:
> +    $ref: /schemas/types.yaml#/definitions/int32
> +    description:
> +      This adjusts the high-speed DC level voltage.
> +      The values defined are in multiples of basis points (1bp = 0.01%).
> +      The hardware accepts only discrete values. The value closest to the
> +      provided input will be chosen as the override value for this param.
> +
> +  qcom,pre-emphasis-duration-bps:
> +    $ref: /schemas/types.yaml#/definitions/int32
> +    description:
> +      This signal controls the duration for which the
> +      HS pre-emphasis current is sourced onto DP<#> or DM<#>.
> +      The HS Transmitter pre-emphasis duration is defined in terms of
> +      unit amounts. One unit of pre-emphasis duration is approximately
> +      650 ps and is defined as 1X pre-emphasis duration.
> +      The values defined are in multiples of basis points (1bp = 0.01%).
> +      The hardware accepts only discrete values. The value closest to the
> +      provided input will be chosen as the override value for this param.
> +
> +  qcom,pre-emphasis-amplitude-bps:
> +    $ref: /schemas/types.yaml#/definitions/int32
> +    description:
> +      This signal controls the amount of current sourced to
> +      DP<#> and DM<#> after a J-to-K or K-to-J transition.
> +      The HS Transmitter pre-emphasis current is defined in terms of unit
> +      amounts. One unit amount is approximately 2 mA and is defined as
> +      1X pre-emphasis current.
> +      The values defined are in multiples of basis points (1bp = 0.01%).
> +      The hardware accepts only discrete values. The value closest to the
> +      provided input will be chosen as the override value for this param.
> +
> +  qcom,hs-rise-fall-time-bps:
> +    $ref: /schemas/types.yaml#/definitions/int32
> +    description:
> +      This adjusts the rise/fall times of the high-speed waveform.
> +      The values defined are in multiples of basis points (1bp = 0.01%).
> +      The hardware accepts only discrete values. The value closest to the
> +      provided input will be chosen as the override value for this param.
> +
> +  qcom,hs-crossover-voltage-mv:
> +    $ref: /schemas/types.yaml#/definitions/int32
> +    description:
> +      This adjusts the voltage at which the DP<#> and DM<#>
> +      signals cross while transmitting in HS mode.
> +      The values defined are in milli volts. The hardware accepts only
> +      discrete values. The value closest to the provided input will be
> +      chosen as the override value for this param.
> +
> +  qcom,hs-output-impedance-mohm:
> +    $ref: /schemas/types.yaml#/definitions/int32

Here and in other places, please use standard units. See
dtschema/schemas/property-units.yaml in dtschema repo.


Best regards,
Krzysztof



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