netdev - Re: [PATCH v2 2/4] dt-bindings: net: qcom: Add binding for shared mdio bus

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Date:   Mon, 17 Sep 2018 16:50:28 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Wang Dongsheng <dongsheng.wang@...-semitech.com>
Cc:     timur@...nel.org, davem@...emloft.net, yu.zheng@...-semitech.com,
        netdev@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 2/4] dt-bindings: net: qcom: Add binding for shared
 mdio bus

On Mon, Sep 17, 2018 at 04:53:29PM +0800, Wang Dongsheng wrote:
> This property copy from "ibm,emac.txt" to describe a shared MIDO bus.
> Since emac include MDIO, so If the motherboard has more than one PHY
> connected to an MDIO bus, this property will point to the MAC device
> that has the MDIO bus.
> 
> Signed-off-by: Wang Dongsheng <dongsheng.wang@...-semitech.com>
> ---
> V2: s/Since QDF2400 emac/Since emac/
> ---
>  Documentation/devicetree/bindings/net/qcom-emac.txt | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/qcom-emac.txt b/Documentation/devicetree/bindings/net/qcom-emac.txt
> index 346e6c7f47b7..50db71771358 100644
> --- a/Documentation/devicetree/bindings/net/qcom-emac.txt
> +++ b/Documentation/devicetree/bindings/net/qcom-emac.txt
> @@ -24,6 +24,9 @@ Internal PHY node:
>  The external phy child node:
>  - reg : The phy address
>  
> +Optional properties:
> +- mdio-device : Shared MIDO bus.

Hi Dongsheng

I don't see why you need this property. The ethernet interface has a
phy-handle which points to a PHY. That is all you need to find the PHY.

        emac0: ethernet@...20000 {
                compatible = "qcom,fsm9900-emac";
                reg = <0xfeb20000 0x10000>,
                      <0xfeb36000 0x1000>;
                interrupts = <76>;

                clocks = <&gcc 0>, <&gcc 1>, <&gcc 3>, <&gcc 4>, <&gcc 5>,
                        <&gcc 6>, <&gcc 7>;
                clock-names = "axi_clk", "cfg_ahb_clk", "high_speed_clk",
                        "mdio_clk", "tx_clk", "rx_clk", "sys_clk";

                internal-phy = <&emac_sgmii>;

                phy-handle = <&phy0>;

                #address-cells = <1>;
                #size-cells = <0>;

                phy0: ethernet-phy@0 {
                        reg = <0>;
                };

                phy1: ethernet-phy@1 {
                        reg = <1>;
                };

                pinctrl-names = "default";
                pinctrl-0 = <&mdio_pins_a>;
        };

        emac1: ethernet@...00000 {
                compatible = "qcom,fsm9900-emac";
		...
		...

                phy-handle = <&phy1>;
	};

	Andrew