Re: [PATCH 1/2] dt-bindings: usb: dwc3: Add binding for USB Gen2 de-emphasis

[Krzysztof Kozlowski]

On 08/10/2024 13:59, Joy Chakraborty wrote:
>>>
>>>>
>>>>> +    description: When set core will set Tx de-emphasis for USB Gen2
>>>>
>>>> And why it cannot be implied by compatible?
>>>
>>> As per my understanding these are tuning coefficients for de-emphasis
>>> particular to a platform and not the dwc3 controller, hence should not
>>> be a controller compatible.
>>
>> Platforms must have specific compatible, so this should be implied by
>> compatible.
> 
> Maybe I am using the word "platform" incorrectly here, what I
> understand is that the same controller(in a chip) when used on 2
> different physical form factors might need different deemphasis

You mean boards? This is board-level property?

> coefficient values to be passed to its Phy. Someone could correct me
> from the USB link stand point if I am mistaken here.
> 

Then please point me to the upstream DTS boards using these properties.
Lore link is enough, if board or DTS change is being upstreamed.

Best regards,
Krzysztof