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Date:   Tue, 25 Aug 2020 13:43:06 -0600
From:   Rob Herring <robh@...nel.org>
To:     Landen Chao <landen.chao@...iatek.com>
Cc:     andrew@...n.ch, f.fainelli@...il.com,
        vivien.didelot@...oirfairelinux.com, matthias.bgg@...il.com,
        mark.rutland@....com, devicetree@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, davem@...emloft.net,
        sean.wang@...iatek.com, opensource@...rst.com,
        frank-w@...lic-files.de, dqfext@...il.com
Subject: Re: [PATCH net-next v2 4/7] dt-bindings: net: dsa: add new MT7531
 binding to support MT7531

On Tue, Aug 18, 2020 at 03:14:09PM +0800, Landen Chao wrote:
> Add devicetree binding to support the compatible mt7531 switch as used
> in the MediaTek MT7531 switch.
> 
> Signed-off-by: Sean Wang <sean.wang@...iatek.com>
> Signed-off-by: Landen Chao <landen.chao@...iatek.com>
> ---
>  .../devicetree/bindings/net/dsa/mt7530.txt    | 71 ++++++++++++++++++-
>  1 file changed, 68 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/dsa/mt7530.txt b/Documentation/devicetree/bindings/net/dsa/mt7530.txt
> index c5ed5d25f642..50eaf40fb612 100644
> --- a/Documentation/devicetree/bindings/net/dsa/mt7530.txt
> +++ b/Documentation/devicetree/bindings/net/dsa/mt7530.txt
> @@ -5,6 +5,7 @@ Required properties:
>  
>  - compatible: may be compatible = "mediatek,mt7530"
>  	or compatible = "mediatek,mt7621"
> +	or compatible = "mediatek,mt7531"
>  - #address-cells: Must be 1.
>  - #size-cells: Must be 0.
>  - mediatek,mcm: Boolean; if defined, indicates that either MT7530 is the part
> @@ -32,10 +33,13 @@ Required properties for the child nodes within ports container:
>  
>  - reg: Port address described must be 6 for CPU port and from 0 to 5 for
>  	user ports.
> -- phy-mode: String, must be either "trgmii" or "rgmii" for port labeled
> -	 "cpu".
> +- phy-mode: String, the follow value would be acceptable for port labeled "cpu"
> +	If compatible mediatek,mt7530 or mediatek,mt7621 is set,
> +	must be either "trgmii" or "rgmii"
> +	If compatible mediatek,mt7531 is set,
> +	must be either "sgmii", "1000base-x" or "2500base-x"
>  
> -Port 5 of the switch is muxed between:
> +Port 5 of mt7530 and mt7621 switch is muxed between:
>  1. GMAC5: GMAC5 can interface with another external MAC or PHY.
>  2. PHY of port 0 or port 4: PHY interfaces with an external MAC like 2nd GMAC
>     of the SOC. Used in many setups where port 0/4 becomes the WAN port.
> @@ -308,3 +312,64 @@ Example 3: MT7621: Port 5 is connected to external PHY: Port 5 -> external PHY.
>  		};
>  	};
>  };
> +
> +Example 4: MT7531BE port6 -- up-clocked 2.5Gbps SGMII -- MT7622 CPU 1st GMAC

Does this really need another example?

> +
> +&eth {
> +	gmac0: mac@0 {
> +		compatible = "mediatek,eth-mac";
> +		reg = <0>;
> +		phy-mode = "2500base-x";
> +
> +		fixed-link {
> +			speed = <2500>;
> +			full-duplex;
> +			pause;
> +		};
> +	};
> +
> +	&mdio0 {
> +		switch@0 {
> +			compatible = "mediatek,mt7531";
> +			reg = <0>;
> +			reset-gpios = <&pio 54 0>;
> +
> +			ports {
> +				#address-cells = <1>;
> +				#size-cells = <0>;
> +				reg = <0>;
> +
> +				port@0 {
> +					reg = <0>;
> +					label = "lan0";
> +				};
> +
> +				port@1 {
> +					reg = <1>;
> +					label = "lan1";
> +				};
> +
> +				port@2 {
> +					reg = <2>;
> +					label = "lan2";
> +				};
> +
> +				port@3 {
> +					reg = <3>;
> +					label = "lan3";
> +				};
> +
> +				port@4 {
> +					reg = <4>;
> +					label = "wan";
> +				};
> +
> +				port@6 {
> +					reg = <6>;
> +					label = "cpu";
> +					ethernet = <&gmac0>;
> +					phy-mode = "2500base-x";
> +				};
> +			};
> +		};
> +	};
> -- 
> 2.17.1

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