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From: "David.Wu" <david.wu@rock-chips.com>
Subject: Re: [PATCH v3 05/11] net: stmmac: dwmac-rk: Add internal phy support
Date: Thu, 3 Aug 2017 22:02:53 +0800
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To: Florian Fainelli <f.fainelli@gmail.com>, davem@davemloft.net, heiko@sntech.de, andrew@lunn.ch, robh+dt@kernel.org, mark.rutland@arm.com, catalin.marinas@arm.com, will.deacon@arm.com, olof@lixom.net, linux@armlinux.org.uk, arnd@arndb.de
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Hi Florian & ChenYu

在 2017/8/3 1:38, Florian Fainelli 写道:
> This is incorrect in two ways:
> 
> - this is a property of the PHY, so it should be documented as such in
> Documentation/devicetree/bindings/net/phy.txt so other bindings can
> re-use it
> 
> - if it was specific to your MAC you would expect a vendor prefix to
> this property, which is not there
> 
> An alternative way to implement the external/internal logic selection
> would be mandate that your Ethernet PHY node have a compatible string
> like this:
> 
> phy@0 {
> 	compatible = "ethernet-phy-id1234.d400", "ethernet-phy-802.3-c22";
> };
> 
> Then you don't need this phy-is-internal property, because you can
> locate the PHY node by the phy-handle (see more about that in a reply to
> patch 10) and you can determine ahead of time whether this PHY is
> internal or not based on its compatible string.

We may implement a read_bool_property after parsed phy phandle at 
stmmac_platform.c, which would make MAC driver know it is a internal phy.