linux-kernel - Re: [PATCH 1/2] dt-bindings: usb/ti,am62-usb.yaml: Add ti,lane-reverse property

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Message-ID: <674b78ca-e4eb-4921-9564-a4490e7ddbca@kernel.org>
Date: Sun, 14 Sep 2025 16:55:41 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Richard GENOUD <richard.genoud@...tlin.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Thinh Nguyen
 <Thinh.Nguyen@...opsys.com>, Aswath Govindraju <a-govindraju@...com>,
 linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 1/2] dt-bindings: usb/ti,am62-usb.yaml: Add
 ti,lane-reverse property

On 09/09/2025 11:11, Richard GENOUD wrote:
>>> diff --git a/Documentation/devicetree/bindings/usb/ti,am62-usb.yaml b/Documentation/devicetree/bindings/usb/ti,am62-usb.yaml
>>> index f6e6d084d1c5..ba894d610af0 100644
>>> --- a/Documentation/devicetree/bindings/usb/ti,am62-usb.yaml
>>> +++ b/Documentation/devicetree/bindings/usb/ti,am62-usb.yaml
>>> @@ -36,6 +36,11 @@ properties:
>>>       items:
>>>         - const: ref
>>>   
>>> +  ti,lane-reverse:
>>> +    description:
>>> +      Should be present if D+ and D- lanes have to be swapped.
>>> +    type: boolean
>>
>> What is not working with existing data-lanes property?
> Hum, indeed. data-lanes could definitely be used here.
> 
>>
>> Plus, lanes are swapped per port, not for entire device, no?
> I'm not sure to get what you mean here.
> The use case I'm trying to address is:
> pin AD10(USB1_DM) of the AM625 is routed to USB_DP pin of an USB connector.
> And pin AE9(USB1_DP) of the AM625 is routed to USB_DM pin of an USB 

I understand what you are trying to achieve and my comment was exactly
about it. You want to change properties of specific connection, high
speed in that case, right? So this belongs to specific port. Just do the
homework and run `git grep data-lanes`.


Best regards,
Krzysztof