netdev - Re: net/dsa/microchip: correct placement of dt property phy-mode?

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Date:   Wed, 17 Jun 2020 23:18:51 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Helmut Grohne <helmut.grohne@...enta.de>
Cc:     Woojung Huh <woojung.huh@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org
Subject: Re: net/dsa/microchip: correct placement of dt property phy-mode?

> If nothing else, it makes the device tree unintuitive to use.
> 
> Is this placement of the phy-mode on the switch intentional?

That i cannot answer.
> 
> If yes: I think this should be prominently documented in
> Documentation/devicetree/bindings/net/dsa/ksz.txt.

Yes, it needs to be documented.

> If no: The microchip driver should follow the documented dsa convention
> and place the phy-mode on the relevant port nodes.
>
> If no: Do we have to support old device trees that have the phy-mode
> property on the switch?

We should not break existing DT blobs. So the driver should be
extended to first look in the port node. If it does not find it there,
look in the switch node. And maybe give a warning if it is found in
the switch node, saying the DT should be updated.

    Andrew