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 16:06:17 +0200
From: Christophe ROULLIER <christophe.roullier@...s.st.com>
To: 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>,
        Marek Vasut <marex@...x.de>, <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

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.