linux-kernel - Re: [PATCH v4 1/6] dt-bindings: phy: samsung,usb3-drd-phy: add ExynosAutov920 HS phy compatible

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Message-ID: <6e1c67d2-9bfa-442a-9d53-8c5970a2a9ef@kernel.org>
Date: Wed, 23 Jul 2025 10:42:42 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Pritam Manohar Sutar <pritam.sutar@...sung.com>,
 'Krzysztof Kozlowski' <krzysztof.kozlowski@...aro.org>
Cc: vkoul@...nel.org, kishon@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, alim.akhtar@...sung.com, andre.draszik@...aro.org,
 peter.griffin@...aro.org, neil.armstrong@...aro.org, kauschluss@...root.org,
 ivo.ivanov.ivanov1@...il.com, m.szyprowski@...sung.com,
 s.nawrocki@...sung.com, linux-phy@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org,
 rosa.pila@...sung.com, dev.tailor@...sung.com, faraz.ata@...sung.com,
 muhammed.ali@...sung.com, selvarasu.g@...sung.com
Subject: Re: [PATCH v4 1/6] dt-bindings: phy: samsung,usb3-drd-phy: add
 ExynosAutov920 HS phy compatible

On 23/07/2025 07:11, Pritam Manohar Sutar wrote:
>> On 22/07/2025 06:34, Pritam Manohar Sutar wrote:
>>>>>> Nothing is explained in changelog/cover letter. You claim you only
>>>>>> added Rb
>>>> tag.
>>>>>> This is an entirely silent change while keeping the review.
>>>>>
>>>>> Will add more explanations in cover letter/changelog why this block is
>> added.
>>>>>
>>>>>> Combined with not even following DTS style!
>>>>>
>>>>> Ok got it. Will change supplies name as below avdd075_usb =>
>>>>> avdd075-usb
>>>>> avdd18_usb20 => avdd18-usb20
>>>>> avdd33_usb20 => avdd33-usb20
>>>>>
>>>>> Confirm the above change that is meant in terms of DTS style.
>>>> Yes. I have doubts that actual supplies have suffix usb20. Are there
>>>> more than one avdd18 for this block?
>>>>
>>>
>>> Yes, there are more than one vdd18 supplies for this block.
>>
>> And their names are?
>>
>>>
>>> Re-analysed your comment on adding new supplies.
>>> Going to re-use existing supplies as mentioned below, rather than
>>> introducing new supplies
>>>
>>>   dvdd-usb20-supply   => for 0.75v
>>>   vddh-usb20-supply   => for 1.8v
>>>   vdd33-usb20-supply => for 3.3v
>>
>>
>> You just expect us to guess whether this is correct...
> 
> Sorry about not being clear so far. 
> 
> V920 needs three supplies, 0.75v, 1.8v and 3.3v for USB PHY
> The naming convention used in the schematic are
> avdd075-usb, 
> avdd18_usb20, 
> avdd33_usb20.
> 
> However, PHY's user manual just mentions DVDD, VDD33 and VDD18.


Then dvdd, vdd33 and vdd18.

> Since GS101 binding already using supply names similar to what is mentioned in the PHY user manual.


GS101 has USB 2.0 and DP, thus the suffix made some sense. I think you
have only USB 2.0, that's why I question the suffix.


Best regards,
Krzysztof