linux-kernel - Re: [PATCH 1/2] dt-bindings: net: phy: Support external PHY xtal

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Date:   Wed, 31 May 2023 14:00:12 -0400
From:   Detlev Casanova <detlev.casanova@...labora.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     linux-kernel@...r.kernel.org,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: net: phy: Support external PHY xtal

On Wednesday, May 31, 2023 11:16:46 A.M. EDT Andrew Lunn wrote:
> On Wed, May 31, 2023 at 11:03:39AM -0400, Detlev Casanova wrote:
> > Ethernet PHYs can have external an clock that needs to be activated before
> > probing the PHY.
> > 
> > Signed-off-by: Detlev Casanova <detlev.casanova@...labora.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
> > 4f574532ee13..e83a33c2aa59 100644
> > --- a/Documentation/devicetree/bindings/net/ethernet-phy.yaml
> > +++ b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
> > 
> > @@ -93,6 +93,16 @@ properties:
> >        the turn around line low at end of the control phase of the
> >        MDIO transaction.
> > 
> > +  clock-names:
> > +    items:
> > +      - const: xtal
> 
> I don't think xtal is the best of names here. It generally is used as
> an abbreviation for crystal. And the commit message is about there not
> being a crystal, but an actual clock.
> 
> How is this clock named on the datasheet?

In the case of the PHY I used (RTL8211F), it is EXT_CLK. But this must be 
generic to any (ethernet) PHY, so using ext_clk to match it would not be
good either.

Now this is about having an external clock, so the ext_clk name makes sense in 
this case.

I'm not pushing one name or another, let's use what you feel is more natural.

Detlev.