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

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Message-ID: <20230717165724.juh77dr4nmoxoehq@pengutronix.de>
Date:   Mon, 17 Jul 2023 18:57:24 +0200
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
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 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.

Regards,
  Marco