netdev - Re: [PATCH net-next v2 7/7] arm64: dts: mt7622: add mt7531 dsa to bananapi-bpi-r64 board

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Date:   Wed, 19 Aug 2020 16:15:01 +0800
From:   Landen Chao <landen.chao@...iatek.com>
To:     Vladimir Oltean <olteanv@...il.com>
CC:     "andrew@...n.ch" <andrew@...n.ch>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "vivien.didelot@...oirfairelinux.com" 
        <vivien.didelot@...oirfairelinux.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Sean Wang <Sean.Wang@...iatek.com>,
        "opensource@...rst.com" <opensource@...rst.com>,
        "frank-w@...lic-files.de" <frank-w@...lic-files.de>,
        "dqfext@...il.com" <dqfext@...il.com>
Subject: Re: [PATCH net-next v2 7/7] arm64: dts: mt7622: add mt7531 dsa to
 bananapi-bpi-r64 board

On Wed, 2020-08-19 at 00:24 +0800, Vladimir Oltean wrote:
> On Tue, Aug 18, 2020 at 03:14:12PM +0800, Landen Chao wrote:
> > Add mt7531 dsa to bananapi-bpi-r64 board for 5 giga Ethernet ports support.
> > 
> > Signed-off-by: Landen Chao <landen.chao@...iatek.com>
> > ---
> >  .../dts/mediatek/mt7622-bananapi-bpi-r64.dts  | 44 +++++++++++++++++++
> >  1 file changed, 44 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts b/arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts
> > index d174ad214857..c57b2571165f 100644
> > --- a/arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts
> > +++ b/arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts
> > @@ -143,6 +143,50 @@
> >  	mdio: mdio-bus {
> >  		#address-cells = <1>;
> >  		#size-cells = <0>;
> > +
> > +		switch@0 {
> > +			compatible = "mediatek,mt7531";
> > +
[snip]
> > +				port@6 {
> > +					reg = <6>;
> > +					label = "cpu";
> > +					ethernet = <&gmac0>;
> > +					phy-mode = "2500base-x";
> > +				};
> 
> Is there any reason why you're not specifying a fixed-link node here?
I got the below feedback in v1, so I follow the DSA common design in v2.
v2 can work with fixed-link node or without fixed-link node in CPU port
node.

  "This fixed-link should not be needed. The DSA driver is supposed to
   configure the CPU port to its fastest speed by default. 2500 is
   the fastest speed a 2500Base-X link can do..."
> > +			};
> > +		};
> > +
> >  	};
> >  };
> >  
> > -- 
> > 2.17.1
> 
> Thanks,
> -Vladimir