linux-kernel - Re: [PATCH] dt-bindings: usb: typec-tcpci: convert to DT schema format

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Message-ID: <7eebc72a-a657-ca67-2c59-60f8e633b878@linaro.org>
Date:   Wed, 29 Mar 2023 09:24:38 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Jun Li <jun.li@....com>, "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Cc:     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Peng Fan <peng.fan@....com>
Subject: Re: [PATCH] dt-bindings: usb: typec-tcpci: convert to DT schema
 format

On 29/03/2023 09:16, Jun Li wrote:
> 
> Per spec below, TCPCI does need interrupt for alert, but no limit on the number.
> 
> "The TCPC uses I2C to communicate with the TCPM. The TCPC is an I2C slave
> with Alert# signal for requesting attention."
> 
>> no supplies and no additional GPIOs (like reset
>> GPIO)?
> 
> Those are out of scope of spec, I think it can be added as optional.
> 
>>
>> Because this is what this binding is saying.
>>
>>> fully compliance with tcpci spec, if change it to be only specific to
>>> nxp,ptn5110, my understanding is then other chips need duplicate a
>>> binding doc even common tcpci binding and driver is enough for them.
>>
>> Depends. Usually we have common schema used by actual device schemas. If
>> TCPCI-compliant device cannot have additional properties,
> 
> My understanding was TCPCI-compliant device can have additional optional
> properties.

Then I propose to rename it to device-matching name (nxp,ptn5110.yaml).
Except interrupt and connector, there is nothing here which describes
actual standard or common class. These can easily be moved to shared
binding later. I can easily imagine TCPCI devices with a bit different
interface and different properties.

Best regards,
Krzysztof