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

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Date:   Tue, 18 Sep 2018 14:35:45 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     "Wang, Dongsheng" <dongsheng.wang@...-semitech.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        "timur@...nel.org" <timur@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "Zheng, Joey" <yu.zheng@...-semitech.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 2/4] dt-bindings: net: qcom: Add binding for shared
 mdio bus

> > If you want to describe the MDIO controller, then you embed a mdio
> > subnode into your Ethernet MAC node:
> >
> >  emac0: ethernet@...20000 {
> > 	mdio {
> > 		#address-cells = <1>;
> > 		#size-cells = <0>;
> >
> > 		phy0: ethernet-phy@0 {
> > 			reg = <0>;
> > 		};
> > 	};
> > };
> >
> > And then each Ethernet MAC controller refers to their appropriate PHY
> > device tree node using a phy-handle property to point to either their
> > own MDIO controller, or another MAC's MDIO controller.

> Sorry, I do not understand how phy-handle point to MDIO controller,
> because phy-handle is defined to point to a phy.

The MAC driver does not care what MDIO controller a PHY is on. All you
need to do to register the PHY is:

	phy_node = of_parse_phandle(np, "phy-handle", 0);
	phy_interface = of_get_phy_mode(np);
	phydev = of_phy_connect(dev, phy_node,
                                &handle_link_change, 0,
                                phy_interface);

	Andrew