linux-kernel - Re: [PATCH net-next 1/2] dt-bindings: net: snps,dwmac: add phy-supply support

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Message-ID: <4287a5b2-698d-4c2d-46a1-4cdeb2ac28e6@linaro.org>
Date:   Tue, 18 Jul 2023 09:59:43 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Marco Felsch <m.felsch@...gutronix.de>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        peppe.cavallaro@...com, alexandre.torgue@...s.st.com,
        joabreu@...opsys.com, mcoquelin.stm32@...il.com,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, kernel@...gutronix.de
Subject: Re: [PATCH net-next 1/2] dt-bindings: net: snps,dwmac: add phy-supply
 support

On 17/07/2023 18:57, Marco Felsch wrote:
> On 23-07-17, Krzysztof Kozlowski wrote:
>> On 17/07/2023 18:43, Marco Felsch wrote:
>>> Document the common phy-supply property to be able to specify a phy
>>> regulator.
>>>
>>> Signed-off-by: Marco Felsch <m.felsch@...gutronix.de>
>>> ---
>>>  Documentation/devicetree/bindings/net/snps,dwmac.yaml | 3 +++
>>>  1 file changed, 3 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
>>> index 363b3e3ea3a60..f66d1839cf561 100644
>>> --- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
>>> +++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
>>> @@ -159,6 +159,9 @@ properties:
>>>        can be passive (no SW requirement), and requires that the MAC operate
>>>        in a different mode than the PHY in order to function.
>>>  
>>> +  phy-supply:
>>> +    description: PHY regulator
>>> +
>>
>> Isn't this property of the PHY? Why would the Ethernet controller play
>> with a supply of a phy?
> 
> Because this is the current state. Please check the all other MACs
> handling the phy-supply (if supported). Some of them handling it under
> the mdio-node (not the phy-node) but most bindings do specify this on
> MAC level (e.g. FEC, DWMAC (suni, rk)).
> 
> I agree that the phy sould handle this but this would be a lot more
> effort and since the dwmac-sun8i/rk bindings do support this on MAC
> level I would keep it that way.

Indeed phy bindings do not allow a supply.

Best regards,
Krzysztof