linux-kernel - Re: [v3 1/3] dt-bindings: phy: qcom,usb-snps-femto-v2: Add phy override params bindings

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Date:   Mon, 9 May 2022 08:22:58 +0530
From:   Pavan Kondeti <quic_pkondeti@...cinc.com>
To:     Krishna Kurapati <quic_kriskura@...cinc.com>
CC:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Stephen Boyd <swboyd@...omium.org>,
        "Doug Anderson" <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Wesley Cheng <wcheng@...eaurora.org>,
        <devicetree@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-phy@...ts.infradead.org>, <quic_pkondeti@...cinc.com>,
        <quic_ppratap@...cinc.com>, <quic_vpulyala@...cinc.com>,
        Sandeep Maheswaram <quic_c_sanm@...cinc.com>
Subject: Re: [v3 1/3] dt-bindings: phy: qcom,usb-snps-femto-v2: Add phy
 override params bindings

Hi Krishna,

On Sun, May 08, 2022 at 05:42:25PM +0530, Krishna Kurapati wrote:
> From: Sandeep Maheswaram <quic_c_sanm@...cinc.com>
> 
> Add device tree bindings for SNPS phy tuning parameters.
> 
> Signed-off-by: Sandeep Maheswaram <quic_c_sanm@...cinc.com>
> Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
> ---
>  .../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..6c2ecdd 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.
>  

<snip>

> +
> +  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:
> +    $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:
> +    $ref: /schemas/types.yaml#/definitions/int32
> +    description:
> +      In some applications, there can be significant series resistance
> +      on the D+ and D- paths between the transceiver and cable. This adjusts
> +      the driver source impedance to compensate for added series
> +      resistance on the USB. The values defined are in milliohms.

%s/milliohms/mill ohms

> +      The hardware accepts only discrete values. The value closest to the
> +      provided input will be chosen as the override value for this param.
> +

What are the units for HS crossover voltage and output impedence? can you add
units as a suffix like other parameters?

Thanks,
Pavan