linux-kernel - Re: [PATCH v4 4/8] dt-bindings: phy: qcom-qusb2: Add support for overriding Phy tuning parameters

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Message-ID: <20200129203819.GE71044@google.com>
Date:   Wed, 29 Jan 2020 12:38:19 -0800
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Sandeep Maheswaram <sanm@...eaurora.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v4 4/8] dt-bindings: phy: qcom-qusb2: Add support for
 overriding Phy tuning parameters

On Wed, Jan 29, 2020 at 07:21:55PM +0530, Sandeep Maheswaram wrote:
> Add support for overriding QUSB2 V2 phy tuning parameters
> in device tree bindings.
> 
> Signed-off-by: Sandeep Maheswaram <sanm@...eaurora.org>
> Reviewed-by: Rob Herring <robh@...nel.org>
> ---
>  .../devicetree/bindings/phy/qcom,qusb2-phy.yaml    | 33 ++++++++++++++++++++++
>  1 file changed, 33 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/phy/qcom,qusb2-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,qusb2-phy.yaml
> index 43082c8..dfef356 100644
> --- a/Documentation/devicetree/bindings/phy/qcom,qusb2-phy.yaml
> +++ b/Documentation/devicetree/bindings/phy/qcom,qusb2-phy.yaml
> @@ -80,6 +80,28 @@ properties:
>          maximum: 63
>          default: 0
>  
> +  qcom,bias-ctrl-value:
> +    description:
> +        It is a 6 bit value that specifies bias-ctrl-value. It is a PHY
> +        tuning parameter that may vary for different boards of same SOC.
> +        This property is applicable to only QUSB2 v2 PHY.

As commented on 'dt-bindings: phy: qcom,qusb2: Convert QUSB2 phy bindings
to yaml' a possible improvement could be to restrict these properties to
the QUSB2 v2 PHY through the schema.

> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/uint32
> +      - minimum: 0
> +        maximum: 63
> +        default: 0
> +
> +  qcom,charge-ctrl-value:
> +    description:
> +        It is a 2 bit value that specifies charge-ctrl-value. It is a PHY
> +        tuning parameter that may vary for different boards of same SOC.
> +        This property is applicable to only QUSB2 v2 PHY.
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/uint32
> +      - minimum: 0
> +        maximum: 3
> +        default: 0
> +
>    qcom,hstx-trim-value:
>      description:
>          It is a 4 bit value that specifies tuning for HSTX
> @@ -118,6 +140,17 @@ properties:
>          maximum: 1
>          default: 0
>  
> +  qcom,hsdisc-trim-value:
> +    description:
> +        It is a 2 bit value tuning parameter that control disconnect
> +        threshold and may vary for different boards of same SOC.
> +        This property is applicable to only QUSB2 v2 PHY.
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/uint32
> +      - minimum: 0
> +        maximum: 3
> +        default: 0
> +
>  required:
>    - compatible
>    - reg

Reviewed-by: Matthias Kaehlcke <mka@...omium.org>