linux-kernel - Re: [PATCH v4 05/12] Documentation: net: phy: Add phy-is-internal binding

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Message-ID: <1bff1793-fe46-f263-fbf5-ef65ffbc5dc9@rock-chips.com>
Date:   Thu, 10 Aug 2017 18:57:40 +0800
From:   "David.Wu" <david.wu@...k-chips.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     davem@...emloft.net, heiko@...ech.de, robh+dt@...nel.org,
        mark.rutland@....com, catalin.marinas@....com, will.deacon@....com,
        olof@...om.net, linux@...linux.org.uk, arnd@...db.de,
        peppe.cavallaro@...com, alexandre.torgue@...com,
        huangtao@...k-chips.com, hwg@...k-chips.com,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 05/12] Documentation: net: phy: Add phy-is-internal
 binding

Hi Andrew, Florian

在 2017/8/10 8:20, Andrew Lunn 写道:
> Hi Florian, David.
> 
> I'm happy with the property name. But i think the text needs more
> description. We deal with Ethernet switches with integrated PHYs. Yet
> for us, this property is unneeded.
> 
> Seeing this property means some bit of software needs to ensure the
> internal PHY should be used, when given the choice between an internal
> and external PHY. So i would say something like:
> 
>      If set, indicates that the PHY is integrated into the same
>      physical package as the Ethernet MAC. If needed, muxers should be
>      configured to ensure the (internal) PHY is used. The absence of this
>      property indicates the muxers should be configured so that the
>      external PHY is used.

Are we supposed to replace the words "internal" with "integrated" here?
So we have three kinds of PHY, they are intenal, external and integrated 
PHYs.

> 
> This last part is important. If the bootloader has set the internal
> PHY to be used, you need to reset it. Otherwise we are going to get
> into a mess sometime later and need to add a phy-is-external property.