netdev - Re: [PATCH v1] net: dsa: qca8k: implement DT-based ports <-> phy translation

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Message-ID: <2061891.QOleSDBFsG@debian64>
Date:   Tue, 05 Feb 2019 23:12:45 +0100
From:   Christian Lamparter <chunkeey@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>
Subject: Re: [PATCH v1] net: dsa: qca8k: implement DT-based ports <-> phy translation

On Tuesday, February 5, 2019 10:29:34 PM CET Andrew Lunn wrote:
> > For now, I added the DT binding update to the patch as well.
> > But if this is indeed the way to go, it'll get a separate patch.
> 
> Hi Christian 
> 
> You need to be careful with the DT binding. You need to keep backwards
> compatible with it. An old DT blob needs to keep working. I don't
> think this is true with this change.

Do you mean because of the 

-               switch0@0 {
+               switch@10 {
                        compatible = "qca,qca8337";
                        #address-cells = <1>;
                        #size-cells = <0>;
 
-                       reg = <0>;
+                       reg = <0x10>;

change?

or because I removed the phy-handles?

The reg = <0x10>; will be necessary regardless. Because this
is really a bug in the existing binding example and if it is
copied it will prevent the qca8k driver from loading. 
This is due to a resource conflict, because there will be 
already a "phy_port1: phy@0" registered at reg = <0>;
So this never worked would have worked.

Regards,
Christian