linux-kernel - Re: [PATCH v3 1/8] dt-bindings: connector: usb-connector: add a gpio used to determine the Type-C port plug orientation

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Date:   Tue, 13 Jun 2023 11:24:42 +0200
From:   neil.armstrong@...aro.org
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...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 v3 1/8] dt-bindings: connector: usb-connector: add a gpio
 used to determine the Type-C port plug orientation

On 13/06/2023 11:02, Krzysztof Kozlowski wrote:
> On 13/06/2023 10:54, Neil Armstrong wrote:
>> On 13/06/2023 10:13, Krzysztof Kozlowski wrote:
>>> On 13/06/2023 09:55, 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>
>>>
>>> Rob had here objections as these are bindings for the connector, not
>>> PMIC glink/altmode. I still doubt that Qualcomm USB Type-C connectors
>>> have such pin exposed. If you open the schematics, the GPIO is actually
>>> coming out from PMIC and is nowhere around the connector. Please drop my
>>> Ack.
>>>
>>> This however could be a pin of the PMIC because it clearly is on the
>>> schematics.
>>
>> Yes it comes from the PMIC, but this part of the PMIC is handled by
>> the PMIC_GLINK firmware service, so the logical place would be into
>> the pmic_glink node with a gpio array in order to handle multi-ports.
> 
> I think all PMICs have only one CC_OUT pin, so this would be now
> maxItems: 1, but there will be no problem in growing this later.

Yep, I'll only allow for sm8550-pmic-glink and set maxItems: 1 for now
since it's the first occurence.

Neil

> 
> Best regards,
> Krzysztof
>