linux-kernel - Re: [PATCH v2 1/4] dt-bindings: usb: typec-tcpci: add tcpci fallback binding

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Date: Sat, 24 Feb 2024 10:15:15 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Marco Felsch <m.felsch@...gutronix.de>
Cc: gregkh@...uxfoundation.org, robh+dt@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, linux@...ck-us.net,
 heikki.krogerus@...ux.intel.com, jun.li@....com, linux-usb@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 kernel@...gutronix.de
Subject: Re: [PATCH v2 1/4] dt-bindings: usb: typec-tcpci: add tcpci fallback
 binding

On 22/02/2024 21:23, Marco Felsch wrote:
> On 24-02-22, Krzysztof Kozlowski wrote:
>> On 15/02/2024 22:28, Marco Felsch wrote:
>>> The NXP PTN5110 [1] is an TCPCI [2] compatible chip, so add the fallback
>>> binding.
>>>
>>> [1] https://www.nxp.com/docs/en/data-sheet/PTN5110.pdf
>>> [2] https://www.usb.org/sites/default/files/documents/usb-port_controller_specification_rev2.0_v1.0_0.pdf
>>>
>>> Signed-off-by: Marco Felsch <m.felsch@...gutronix.de>
>>> ---
>>> v2:
>>> - rephrase commit message
>>>
>>>  Documentation/devicetree/bindings/usb/nxp,ptn5110.yaml | 4 +++-
>>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/usb/nxp,ptn5110.yaml b/Documentation/devicetree/bindings/usb/nxp,ptn5110.yaml
>>> index eaedb4cc6b6c..7bd7bbbac9e0 100644
>>> --- a/Documentation/devicetree/bindings/usb/nxp,ptn5110.yaml
>>> +++ b/Documentation/devicetree/bindings/usb/nxp,ptn5110.yaml
>>> @@ -11,7 +11,9 @@ maintainers:
>>>  
>>>  properties:
>>>    compatible:
>>> -    const: nxp,ptn5110
>>> +    enum:
>>> +      - nxp,ptn5110
>>> +      - tcpci
>>
>> That's not a fallback, but enum. Fallback is "items" and then you could
> 
> Damn, you're right. Sorry.
> 
>> also send a follow-up patchset (separate, so Greg won't take it) fixing
>> DTS (if not, let me know, so I will fix it).
> 
> Sry. but I don't get this. Why do I need to send a follow-up? Greg did
> not apply anything, at least I didn't received an e-mail, that this
> patchset was picked.

If you change existing ptn5110 to a list of ptn5110+fallback, then all
existing will DTS start report warnings. Someone needs to fix this.

Best regards,
Krzysztof