Re: [PATCH] usb: typec: ucsi: Get the connector fwnode based on reg value

[Prashanth K]

On 9/18/2026 2:48 PM, Heikki Krogerus wrote:
> On Wed, Sep 16, 2026 at 09:58:08AM +0530, Prashanth K wrote:
>> ucsi_find_fwnode() currently maps UCSI connectors to Device tree
>> connector nodes based on the order in which connector child nodes
>> are described in DT.
>>
>> This can fail because the ordering of child nodes isn't guaranteed
>> in Device-tree. For example, DTB may contain connector@1 before
>> connector@0, causing connector numbers to be associated with the wrong
>> fwnode. As a result, role switch and Type-C notifications can be
>> delivered to the wrong remote endpoints.
>>
>> Fix this by using the "reg" property of each connector to match
>> its corresponding fwnode. While at it, if the reg property isn't
>> present, then fall back to the old method.
>>
>> Fixes: c1b0bc2dabfa ("usb: typec: Add support for UCSI interface")
> 
> That commit does not yet include any kind of support for DT.
> 

I understand DT wasn't added at the point where this commit was
authored. But this is the base commit where the bug was introduced,
that's why I added it in fixes tag. Do you have any other suggestion ?

The patch simply distinguishes connectors with and without <reg>
property and uses different logics, hence it should work for all targets.

Regards,
Prashanth K