linux-kernel - Re: [PATCH RFC 1/7] dt-bindings: connector: usb-connector: add a gpio used to determine the Type-C port plug orientation

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Date:   Sat, 3 Jun 2023 23:22:29 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Neil Armstrong <neil.armstrong@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Rob Herring <robh@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH RFC 1/7] dt-bindings: connector: usb-connector: add a gpio
 used to determine the Type-C port plug orientation

On 01/06/2023 17:07, Neil Armstrong wrote:
> On some platforms, the Type-C plug orientation is given on a GPIO line.
> 
> Document this optional Type-C connector property, and take the
> assumption an active level represents an inverted/flipped orientation.
> 
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>   Documentation/devicetree/bindings/connector/usb-connector.yaml | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/connector/usb-connector.yaml b/Documentation/devicetree/bindings/connector/usb-connector.yaml
> index ae515651fc6b..c3884eed6ba4 100644
> --- a/Documentation/devicetree/bindings/connector/usb-connector.yaml
> +++ b/Documentation/devicetree/bindings/connector/usb-connector.yaml
> @@ -114,6 +114,11 @@ properties:
>       description: Set this property if the Type-C connector has no power delivery support.
>       type: boolean
>   
> +  orientation-gpios:
> +    description: An input gpio for Type-C connector orientation, used to detect orientation
> +      of the Type-C connector. GPIO active level means "CC2" or Reversed/Flipped orientation.
> +    maxItems: 1

Should this be a property of the connector or of the parent device node? 
I mean, unlike usb-b-connector (where ID and Vbus can be simple GPIOs 
nearly directly connected to the pins of the connector) for the USB-C 
the orientation is not a connector's GPIO, but rather some additional 
not elementary logic.

> +
>     # The following are optional properties for "usb-c-connector" with power
>     # delivery support.
>     source-pdos:
> 

-- 
With best wishes
Dmitry