linux-kernel - Re: [PATCH 1/2] dt-bindings: phy: spacemit: add regulator support to K1 USB2 PHY

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Message-ID: <89882b75-dc80-479b-b2b2-199bebe4ecc3@kernel.org>
Date: Sat, 7 Feb 2026 11:49:17 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Chukun Pan <amadeus@....edu.cn>
Cc: Yixun Lan <dlan@...nel.org>, Vinod Koul <vkoul@...nel.org>,
 Ze Huang <huang.ze@...ux.dev>, Rob Herring <robh@...nel.org>,
 Mark Brown <broonie@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
 Liam Girdwood <lgirdwood@...il.com>, Krzysztof Kozlowski
 <krzk+dt@...nel.org>, Neil Armstrong <neil.armstrong@...aro.org>,
 linux-riscv@...ts.infradead.org, linux-phy@...ts.infradead.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 spacemit@...ts.linux.dev
Subject: Re: [PATCH 1/2] dt-bindings: phy: spacemit: add regulator support to
 K1 USB2 PHY

On 07/02/2026 11:48, Krzysztof Kozlowski wrote:
> On Fri, Feb 06, 2026 at 06:00:08PM +0800, Chukun Pan wrote:
>> Add an optional phy-supply property to describe the regulator
>> supplying for USB VBUS.
> 
> Why wasn't it there before? USB did not have VBUS?
> 
> Explanation is so incomplete I suspect you are patching broken things,
> so as well this could be completely different hardware (e.g. there is no
> regulator for this block but e.g. connector).
> 
> 
>>
>> Signed-off-by: Chukun Pan <amadeus@....edu.cn>
>> ---
>>  Documentation/devicetree/bindings/phy/spacemit,usb2-phy.yaml | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/phy/spacemit,usb2-phy.yaml b/Documentation/devicetree/bindings/phy/spacemit,usb2-phy.yaml
>> index 43eaca90d88c..74a1cd5bcdbe 100644
>> --- a/Documentation/devicetree/bindings/phy/spacemit,usb2-phy.yaml
>> +++ b/Documentation/devicetree/bindings/phy/spacemit,usb2-phy.yaml
>> @@ -19,6 +19,10 @@ properties:
>>    clocks:
>>      maxItems: 1
>>  
>> +  phy-supply:
>> +    description:
>> +      Phandle to a regulator that provides power to VBUS.
> 
> Drop redundant part. This cannot be anything else than phandle and
> regulator.
> 
> "VBUS power supply" for example. But anyway, I don't have certainty that
> this is correct hardware representation. It's your task to provide that.


Plus, if this was a vbus regulator it would not be called "phy"... Even
more confusing.

Best regards,
Krzysztof