linux-kernel - Re: [PATCH v2 1/2] dt-bindings: phy: Add qcom,dp-manual-pullup description

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Date:   Fri, 30 Dec 2022 09:21:56 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Bryan O'Donoghue <bryan.odonoghue@...aro.org>, agross@...nel.org,
        andersson@...nel.org, vkoul@...nel.org, kishon@...nel.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org
Cc:     konrad.dybcio@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: phy: Add qcom,dp-manual-pullup
 description

On 29/12/2022 19:34, Bryan O'Donoghue wrote:
> The original Qualcomm driver for the HighSpeed USB PHY contains a flag
> which tells the driver that the controller and PHY do not connect to VBUS.
> 
> In this case an external IC such as a Type-C port manager supplies VBUS and
> the VBUS signal is not routed to the SoC. This means we cannot detect the
> presence or absence of VBUS and cannot take action based on it.
> 
> Document the downstream boolean qcom,dp-manual-pullup to allow the HS PHY
> implement the necessary logic.
> 
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> ---
>  Documentation/devicetree/bindings/phy/qcom,usb-hs-phy.yaml | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/phy/qcom,usb-hs-phy.yaml b/Documentation/devicetree/bindings/phy/qcom,usb-hs-phy.yaml
> index aa97478dd0161..c55a59df71ad0 100644
> --- a/Documentation/devicetree/bindings/phy/qcom,usb-hs-phy.yaml
> +++ b/Documentation/devicetree/bindings/phy/qcom,usb-hs-phy.yaml
> @@ -80,6 +80,13 @@ properties:
>              the address is offset from the ULPI_EXT_VENDOR_SPECIFIC address
>          - description: value
>  
> +  qcom,dp-manual-pullup:
> +    type: boolean
> +    description: This flag indicates to the HS USB PHY driver that it should

Drop references to the driver and rephrase it to describe the controller
behavior/feature or the board layout/configuration, not the driver. The
same applies to property name - "manual pullup" is describing driver,
not hardware.

> +                 enable or disable an internal pullup when powering on or
> +                 powering off the HS PHY instead of toggling the value when VBUS
> +                 is absent or present.

Wrong indentation. It's two spaces.

> +
>  required:
>    - clocks
>    - clock-names

Best regards,
Krzysztof