linux-kernel - Re: [PATCH net 2/2] arm: dts: mediatek: Fix mt7629 dts to reflect the latest dt-binding

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Date:   Wed, 2 Oct 2019 17:21:28 +0800
From:   mtk15127 <Mark-MC.Lee@...iatek.com>
To:     René van Dorst <opensource@...rst.com>
CC:     "David S. Miller" <davem@...emloft.net>,
        Sean Wang <sean.wang@...iatek.com>,
        John Crispin <john@...ozen.org>,
        Felix Fietkau <nbd@...nwrt.org>,
        Nelson Chang <nelson.chang@...iatek.com>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        "Mark Rutland" <mark.rutland@....com>,
        <devicetree@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, MarkLee <Mark-MC.Lee@...iatek.com>
Subject: Re: [PATCH net 2/2] arm: dts: mediatek: Fix mt7629 dts to reflect
 the latest dt-binding

On Tue, 2019-10-01 at 13:56 +0000, René van Dorst wrote:
> Hi MarkLee,
> 
> Quoting MarkLee <Mark-MC.Lee@...iatek.com>:
> 
> > * Removes mediatek,physpeed property from dtsi that is useless in PHYLINK
> > * Set gmac0 to fixed-link sgmii 2.5Gbit mode
> > * Set gmac1 to gmii mode that connect to a internal gphy
> >
> > Signed-off-by: MarkLee <Mark-MC.Lee@...iatek.com>
> > ---
> >  arch/arm/boot/dts/mt7629-rfb.dts | 13 ++++++++++++-
> >  arch/arm/boot/dts/mt7629.dtsi    |  2 --
> >  2 files changed, 12 insertions(+), 3 deletions(-)
> >
> > diff --git a/arch/arm/boot/dts/mt7629-rfb.dts  
> > b/arch/arm/boot/dts/mt7629-rfb.dts
> > index 3621b7d2b22a..6bf1f7d8ddb5 100644
> > --- a/arch/arm/boot/dts/mt7629-rfb.dts
> > +++ b/arch/arm/boot/dts/mt7629-rfb.dts
> > @@ -66,9 +66,21 @@
> >  	pinctrl-1 = <&ephy_leds_pins>;
> >  	status = "okay";
> >
> > +	gmac0: mac@0 {
> > +		compatible = "mediatek,eth-mac";
> > +		reg = <0>;
> > +		phy-mode = "sgmii";
> > +		fixed-link {
> > +			speed = <2500>;
> > +			full-duplex;
> > +			pause;
> > +		};
> > +	};
> > +
> >  	gmac1: mac@1 {
> >  		compatible = "mediatek,eth-mac";
> >  		reg = <1>;
> > +		phy-mode = "gmii";
> >  		phy-handle = <&phy0>;
> >  	};
> >
> > @@ -78,7 +90,6 @@
> >
> >  		phy0: ethernet-phy@0 {
> >  			reg = <0>;
> > -			phy-mode = "gmii";
> >  		};
> >  	};
> >  };
> > diff --git a/arch/arm/boot/dts/mt7629.dtsi b/arch/arm/boot/dts/mt7629.dtsi
> > index 9608bc2ccb3f..867b88103b9d 100644
> > --- a/arch/arm/boot/dts/mt7629.dtsi
> > +++ b/arch/arm/boot/dts/mt7629.dtsi
> > @@ -468,14 +468,12 @@
> >  			compatible = "mediatek,mt7629-sgmiisys", "syscon";
> >  			reg = <0x1b128000 0x3000>;
> >  			#clock-cells = <1>;
> > -			mediatek,physpeed = "2500";
> >  		};
> >
> >  		sgmiisys1: syscon@...30000 {
> >  			compatible = "mediatek,mt7629-sgmiisys", "syscon";
> >  			reg = <0x1b130000 0x3000>;
> >  			#clock-cells = <1>;
> > -			mediatek,physpeed = "2500";
> >  		};
> >  	};
> >  };
> > --
> > 2.17.1
> 
> Does MT7629 soc has the same SGMII IP block as on the MT7622?
> If that is the case then phy-mode should set to "2500base-x".
  Yes,MT7629 and MT7622 use the same SGMII block. 
  Thanks for your suggestion, will change gmac0 phy-mode to "2500base-x"
  in the next patch.

Mark
> See discussion about the MT7622 [1] and dts of  
> mt7622-bananapi-bpi-r64.dts[2][3]
> 
> Note the code only set the phy in overclock mode if phymode =  
> 2500base-x and the
> link is a fixed-link, see [4].
> Alsp the current code doesn't support sgmii so well. Sgmii at 2.5Gbit is not
> supported at all.
> 
> Greats,
> 
> René
> 
> [1]:  
> https://lore.kernel.org/netdev/20190822144433.GT13294@shell.armlinux.org.uk/
> [2]:  
> https://lore.kernel.org/netdev/20190825174341.20750-4-opensource@vdorst.com/
> [3]:  
> https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/tree/arch/arm64/boot/dts/mediatek/mt7622-bananapi-bpi-r64.dts#n122
> [4]:  
> https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/tree/drivers/net/ethernet/mediatek/mtk_sgmii.c#n72
> 
> 
> 
> 
>