linux-kernel - Re: Aw: [RFC PATCH net-next] dt-bindings: net: dsa: mediatek,mt7530: completely rework binding

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Date:   Wed, 27 Jul 2022 23:59:16 +0300
From:   Arınç ÜNAL <arinc.unal@...nc9.com>
To:     Frank Wunderlich <frank-w@...lic-files.de>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "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>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Luiz Angelo Daros de Luca <luizluca@...il.com>,
        Sander Vanheule <sander@...nheule.net>,
        René van Dorst <opensource@...rst.com>,
        Daniel Golle <daniel@...rotopia.org>, erkin.bozoglu@...ont.com,
        Sergio Paracuellos <sergio.paracuellos@...il.com>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: Aw: [RFC PATCH net-next] dt-bindings: net: dsa: mediatek,mt7530:
 completely rework binding

On 27.07.2022 23:31, Frank Wunderlich wrote:
> 
>> Gesendet: Dienstag, 26. Juli 2022 um 14:24 Uhr
>> Von: "Arınç ÜNAL" <arinc.unal@...nc9.com>
> 
> Hi,
> 
>> To Frank:
>> Let me know if MII bindings for port 5 and 6 on MT7531 are okay.
> 
> I ack krzysztof, that the change is really huge and it is hard to understand what exactly is changed and why. So please split. I have converted
> it to yaml, but not have changed the logic itself. I guess you know the switch better than me.
> 
>> Does your recent patch for MT7531 make it possible to set any port for CPU,
>> including user ports? For now, I put a rule to restrict CPU ports to 5 and
>> 6, as described on the description of dsa port reg property.
> 
> i only know that port 5 and 6 are possible, not about the other ports. Afair there was a check if port 5 or 6 (followed by available modes
> like rgmii, trgmii or sgmii) and then allow cpu-port-mode else allow only user-port mode. Had not changed this, so currently only these 2
> ports can be used as CPU.
> 
>> I suppose your patch does not bring support for using MT7530's port 5 as
>> CPU port. We could try this on a BPI-R2. Device schematics show that
>> MT7530's GMII pins are wired to GMAC1 of MT7623NI to work as RGMII.
> 
> my patches (and the version from Vladimir that was merged) only solves the Problem that CPU-Port was fixed to 6 before. I tested Patches on r2
> (mt7530) and r64 too (mt7531) that they do not break anything. But i have not disabled port 6 (maybe i had to do so for a port5-only mode), only
> enabled port 5 too and run iperf3 over a vlan-aware bridge between wan-port and port 5.

I've seen this under mt7530_setup():
The bit for MHWTRAP_P6_DIS is cleared to enable port 6 with the comment 
"Enable Port 6 only; P5 as GMAC5 which currently is not supported".

https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/tree/drivers/net/dsa/mt7530.c#n2189

I'm slowly learning C programming so I can't currently manage to do 
something on my own here, just letting you know.

Arınç