netdev - Re: [PATCH devicetree 2/2] dt-bindings: phy: Add `tx-amplitude-microvolt` property binding

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Message-ID: <YbploCb6sJRN+HJH@robh.at.kernel.org>
Date:   Wed, 15 Dec 2021 16:01:04 -0600
From:   Rob Herring <robh@...nel.org>
To:     Marek Behún <kabel@...nel.org>
Cc:     Andrew Lunn <andrew@...n.ch>, devicetree@...r.kernel.org,
        Vladimir Oltean <olteanv@...il.com>,
        Holger Brunck <holger.brunck@...achienergy.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Russell King <rmk+kernel@...linux.org.uk>,
        linux-phy@...ts.infradead.org, Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>
Subject: Re: [PATCH devicetree 2/2] dt-bindings: phy: Add
 `tx-amplitude-microvolt` property binding

On Wed, Dec 15, 2021 at 06:22:22PM +0100, Marek Behún wrote:
> On Wed, 15 Dec 2021 11:55:00 +0100
> Andrew Lunn <andrew@...n.ch> wrote:
> 
> > On Wed, Dec 15, 2021 at 12:34:32AM +0100, Marek Behún wrote:
> > > Common PHYs often have the possibility to specify peak-to-peak voltage
> > > on the differential pair - the default voltage sometimes needs to be
> > > changed for a particular board.  
> > 
> > Hi Marek
> > 
> > Common PHYs are not the only user of this. Ethernet PHYs can also use
> > it, as well as SERDESes embedded within Ethernet switches.
> > 
> > That is why i suggested these properties go into something like
> > serdes.yaml. That can then be included into Common PHY, Ethernet PHYs,
> > switch drivers etc.
> > 
> > Please could you make such a split?
> > 
> >        Andrew
> 
> Hi Andrew,
> 
> and where (into which directory) should this serdes.yaml file go?
> 
> My idea was to put the properties into common PHY and then refer to
> them from other places, so for example this would be put into ethernet
> PHY binding:
> 
>   serdes-tx-amplitude-microvolt:

Why do you need a different name here? 

>     $ref: '/schemas/phy/phy.yaml#/properties/tx-amplitude-microvolt'

This is a pattern I try to avoid generally. Put what's common in 1 
schema file and then reference all of it from the top level.

Rob