linux-kernel - Re: [RFC PATCH net-next v5 21/25] devicetree: bindings: dsa: qca8k: Document internal mdio definition

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Date:   Tue, 11 May 2021 11:23:00 -0500
From:   Rob Herring <robh@...nel.org>
To:     Ansuel Smith <ansuelsmth@...il.com>
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>,
        Jakub Kicinski <kuba@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "open list:NETWORKING DRIVERS" <netdev@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH net-next v5 21/25] devicetree: bindings: dsa: qca8k:
 Document internal mdio definition

On Tue, May 11, 2021 at 04:04:56AM +0200, Ansuel Smith wrote:
> Document new way of declare mapping of internal PHY to port.
> The new implementation directly declare the PHY connected to the port
> by adding a node in the switch node. The driver detect this and register
> an internal mdiobus using the mapping defined in the mdio node.
> 
> Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> ---
>  .../devicetree/bindings/net/dsa/qca8k.txt     | 39 +++++++++++++++++++
>  1 file changed, 39 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/dsa/qca8k.txt b/Documentation/devicetree/bindings/net/dsa/qca8k.txt
> index 1daf68e7ae19..3973a9d3e426 100644
> --- a/Documentation/devicetree/bindings/net/dsa/qca8k.txt
> +++ b/Documentation/devicetree/bindings/net/dsa/qca8k.txt
> @@ -21,6 +21,10 @@ described in dsa/dsa.txt. If the QCA8K switch is connect to a SoC's external
>  mdio-bus each subnode describing a port needs to have a valid phandle
>  referencing the internal PHY it is connected to. This is because there's no
>  N:N mapping of port and PHY id.
> +To declare the internal mdio-bus configuration, declare a mdio node in the
> +switch node and declare the phandle for the port referencing the internal
> +PHY is connected to. In this config a internal mdio-bus is registred and

registered

Otherwise,

Reviewed-by: Rob Herring <robh@...nel.org>

> +the mdio MASTER is used as communication.
>  
>  Don't use mixed external and internal mdio-bus configurations, as this is
>  not supported by the hardware.
> @@ -150,26 +154,61 @@ for the internal master mdio-bus configuration:
>  				port@1 {
>  					reg = <1>;
>  					label = "lan1";
> +					phy-mode = "internal";
> +					phy-handle = <&phy_port1>;
>  				};
>  
>  				port@2 {
>  					reg = <2>;
>  					label = "lan2";
> +					phy-mode = "internal";
> +					phy-handle = <&phy_port2>;
>  				};
>  
>  				port@3 {
>  					reg = <3>;
>  					label = "lan3";
> +					phy-mode = "internal";
> +					phy-handle = <&phy_port3>;
>  				};
>  
>  				port@4 {
>  					reg = <4>;
>  					label = "lan4";
> +					phy-mode = "internal";
> +					phy-handle = <&phy_port4>;
>  				};
>  
>  				port@5 {
>  					reg = <5>;
>  					label = "wan";
> +					phy-mode = "internal";
> +					phy-handle = <&phy_port5>;
> +				};
> +			};
> +
> +			mdio {
> +				#address-cells = <1>;
> +				#size-cells = <0>;
> +
> +				phy_port1: phy@0 {
> +					reg = <0>;
> +				};
> +
> +				phy_port2: phy@1 {
> +					reg = <1>;
> +				};
> +
> +				phy_port3: phy@2 {
> +					reg = <2>;
> +				};
> +
> +				phy_port4: phy@3 {
> +					reg = <3>;
> +				};
> +
> +				phy_port5: phy@4 {
> +					reg = <4>;
>  				};
>  			};
>  		};
> -- 
> 2.30.2
>