linux-kernel - Re: [PATCH 1/4] dt-bindings: soc: qcom: qcom,pmic-glink: add a gpio used to determine the Type-C port plug orientation

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Date:   Mon, 14 Aug 2023 10:09:41 +0200
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Bjorn Andersson <andersson@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 1/4] dt-bindings: soc: qcom: qcom,pmic-glink: add a gpio
 used to determine the Type-C port plug orientation

On 04/08/2023 18:03, Bjorn Andersson wrote:
> On Fri, Aug 04, 2023 at 03:50:07PM +0200, Neil Armstrong wrote:
>> On SM8450 and SM8550 based platforms, the Type-C plug orientation is given on a
>> GPIO line set by the PMIC.
>>
>> 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>
>> ---
>>   .../devicetree/bindings/soc/qcom/qcom,pmic-glink.yaml  | 18 ++++++++++++++++++
>>   1 file changed, 18 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,pmic-glink.yaml b/Documentation/devicetree/bindings/soc/qcom/qcom,pmic-glink.yaml
>> index bceb479f74c5..1b0a00b19a54 100644
>> --- a/Documentation/devicetree/bindings/soc/qcom/qcom,pmic-glink.yaml
>> +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,pmic-glink.yaml
>> @@ -35,6 +35,11 @@ properties:
>>     '#size-cells':
>>       const: 0
>>   
>> +  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.
> 
> This is a per-connector/port property, as such be part of the connector
> sub nodes rather than as a property of the shared pmic_glink entity.

This has been rejected by Rob, Dmitry & Krzysztof in:
https://lore.kernel.org/all/0fbf55e7-2140-751d-5347-f907a46ef78c@linaro.org/
&
https://lore.kernel.org/all/20230608154751.GA2750742-robh@kernel.org/

Indeed the "GPIO" is not part of the physical USB-C connector, but a property,
and it's not part of the PMIC GLINK firmware either, so ?

The PMIC function which generates this signal is handled by the PMIC GLINK
firmware, so this representation is the most accurate.

Neil

> 
> Regards,
> Bjorn
> 
>> +    maxItems: 1
>> +
>>   patternProperties:
>>     '^connector@\d$':
>>       $ref: /schemas/connector/usb-connector.yaml#
>> @@ -44,6 +49,19 @@ patternProperties:
>>   required:
>>     - compatible
>>   
>> +allOf:
>> +  - if:
>> +      not:
>> +        properties:
>> +          compatible:
>> +            contains:
>> +              enum:
>> +                - qcom,sm8450-pmic-glink
>> +                - qcom,sm8550-pmic-glink
>> +    then:
>> +      properties:
>> +        orientation-gpios: false
>> +
>>   additionalProperties: false
>>   
>>   examples:
>>
>> -- 
>> 2.34.1
>>