linux-kernel - Re: [PATCH 3/6] dt-bindings: net: Add documentation for phy-supply

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Date:   Mon, 9 May 2022 14:17:27 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Corentin Labbe <clabbe@...libre.com>
Cc:     alexandre.torgue@...s.st.com, broonie@...nel.org,
        calvin.johnson@....nxp.com, davem@...emloft.net,
        edumazet@...gle.com, hkallweit1@...il.com,
        jernej.skrabec@...il.com, joabreu@...opsys.com,
        krzysztof.kozlowski+dt@...aro.org, kuba@...nel.org,
        lgirdwood@...il.com, linux@...linux.org.uk, pabeni@...hat.com,
        peppe.cavallaro@...com, robh+dt@...nel.org, samuel@...lland.org,
        wens@...e.org, netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH 3/6] dt-bindings: net: Add documentation for phy-supply

On Mon, May 09, 2022 at 07:48:54AM +0000, Corentin Labbe wrote:
> Add entries for the 2 new phy-supply and phy-io-supply.
> 
> Signed-off-by: Corentin Labbe <clabbe@...libre.com>
> ---
>  .../devicetree/bindings/net/ethernet-phy.yaml          | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/ethernet-phy.yaml b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
> index ed1415a4381f..2a6b45ddf010 100644
> --- a/Documentation/devicetree/bindings/net/ethernet-phy.yaml
> +++ b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
> @@ -153,6 +153,16 @@ properties:
>        used. The absence of this property indicates the muxers
>        should be configured so that the external PHY is used.
>  
> +  phy-supply:
> +    description:
> +      Phandle to a regulator that provides power to the PHY. This
> +      regulator will be managed during the PHY power on/off sequence.
> +
> +  phy-io-supply:
> +    description:
> +      Phandle to a regulator that provides power to the PHY. This
> +      regulator will be managed during the PHY power on/off sequence.

If you need two differently named regulators, you need to make it clear
how they differ. My _guess_ would be, you only need the io variant in
order to talk to the PHY registers. However, to talk to a link
partner, you need the other one enabled as well. Which means handling
that regulator probably should be in the PHY driver, so it is enabled
only when the interface is configured up.

     Andrew