linux-kernel - Re: [PATCH v1 2/2] dt-bindings: extcon: Add Realtek DHC RTD SoC Type-C

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Date:   Thu, 24 Aug 2023 10:43:12 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Stanley Chang[昌育德] 
        <stanley_chang@...ltek.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>
Cc:     Chanwoo Choi <cw00.choi@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v1 2/2] dt-bindings: extcon: Add Realtek DHC RTD SoC
 Type-C

On 24/08/2023 09:23, Stanley Chang[昌育德] wrote:
> Hi Krzysztof,
> 
>>>>> +
>>>>> +title: Realtek DHC RTD SoCs USB Type-C detection
>>>>
>>>> Type-c usually go to usb directory.
>>>
>>> This binding is not for a type-c controller.
>>> It is an extcon device for type-c connector detection.
>>> So I put it at extcon directory.
>>
>> If this is not a type-c controller, then what is it? Explain me please what is an
>> "extcon device" without using any Linux subsystem naming.
> 
> Sorry. "extcon device" may be the wrong name I'm using.
> 
> As far as I know, type-c controller supports PD detection, role detection, role swap and cc configuration.
> But in our SoC, type c module only supports role detection.
> So I don't think it's a type-c controller.

So module handling some parts of "Type-C" is not a "Type-C controller"
but if such module handles a bit more, it becomes Type-C?

> 
> I found a similar driver at
> drivers/extcon/extcon-usbc-cros-ec.c
> It belongs to External Connector, which can detect USB Type C cables.

That's a driver, not a binding...

> 
> So our driver is an external connector driver.

Driver yes, not binding.

> 
>>>
>>> And I will add “connector” to the title.
>>> title: Realtek DHC RTD SoCs USB Type-C Connector detection
>>
>> So usb...
> 
> I refer to this binding, and it is in folder bindings/extcon.
> docs/devicetree/bindings/extcon/extcon-usbc-cros-ec.yaml
> Title: ChromeOS EC USB Type-C Cable and Accessory Detection

So maybe it should be moved as well?

extcon is a Linux framework. If you think extcon is a type of hardware,
then please tell me what it is exactly. Please define it. And then I
wonder why the name "extcon" is anyhow connected to Type-C USB.

Best regards,
Krzysztof