linux-kernel - Re: [PATCH v2 1/8] dt-bindings: connector: usb-connector: add a gpio used to determine the Type-C port plug orientation

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Message-ID: <20230608154751.GA2750742-robh@kernel.org>
Date:   Thu, 8 Jun 2023 09:47:51 -0600
From:   Rob Herring <robh@...nel.org>
To:     Neil Armstrong <neil.armstrong@...aro.org>
Cc:     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>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH v2 1/8] dt-bindings: connector: usb-connector: add a gpio
 used to determine the Type-C port plug orientation

On Wed, Jun 07, 2023 at 10:05:00AM +0200, 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.
> 
> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 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

There's no such GPIO on a USB-C connector. Please explain this h/w 
better (in the commit message and/or description). Perhaps it is simple 
enough logic to leave the GPIO here. Perhaps there's more to the h/w you 
are not (yet) describing.

Rob