linux-kernel - Re: [PATCH v2 02/11] dt-bindings: net: add phy-supply property for stm32

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Date: Mon, 13 May 2024 16:20:10 +0200
From: Marek Vasut <marex@...x.de>
To: Christophe ROULLIER <christophe.roullier@...s.st.com>,
 Rob Herring <robh@...nel.org>
Cc: "David S . Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Richard Cochran <richardcochran@...il.com>, Jose Abreu
 <joabreu@...opsys.com>, Liam Girdwood <lgirdwood@...il.com>,
 Mark Brown <broonie@...nel.org>, netdev@...r.kernel.org,
 devicetree@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 02/11] dt-bindings: net: add phy-supply property for
 stm32

On 5/13/24 4:06 PM, Christophe ROULLIER wrote:
> Hi
> 
> On 4/26/24 17:30, Rob Herring wrote:
>> On Fri, Apr 26, 2024 at 02:56:58PM +0200, Christophe Roullier wrote:
>>> Phandle to a regulator that provides power to the PHY. This
>>> regulator will be managed during the PHY power on/off sequence.
>>>
>>> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>>> Signed-off-by: Christophe Roullier <christophe.roullier@...s.st.com>
>>> ---
>>>   Documentation/devicetree/bindings/net/stm32-dwmac.yaml | 3 +++
>>>   1 file changed, 3 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/net/stm32-dwmac.yaml 
>>> b/Documentation/devicetree/bindings/net/stm32-dwmac.yaml
>>> index b901a432dfa9..7c3aa181abcb 100644
>>> --- a/Documentation/devicetree/bindings/net/stm32-dwmac.yaml
>>> +++ b/Documentation/devicetree/bindings/net/stm32-dwmac.yaml
>>> @@ -84,6 +84,9 @@ properties:
>>>             - description: offset of the control register
>>>             - description: field to set mask in register
>>> +  phy-supply:
>>> +    description: PHY regulator
>> This is for which PHY? The serdes phy or ethernet phy? This only makes
>> sense here if the phy is part of the MAC. Otherwise, it belongs in the
>> phy node.
>>
>> Rob
> 
> You are right, normally it should be managed in Ethernet PHY (Realtek, 
> Microchip etc...)
> 
> Lots of glue manage this like this. Does it forbidden now ? if yes need 
> to update PHY driver to manage this property.

If the regulator is connected to the PHY, then the supply should be 
described in the PHY node and you wouldn't even need these PHY patches 
(also see my comment that you should split the PHY regulator part of 
this patchset into separate series).