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From: Corentin Labbe <clabbe.montjoie-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH 0/3] net-next: stmmac: support future
 possible different internal phy mode
Date: Fri, 28 Jul 2017 16:44:24 +0200
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To: Andrew Lunn <andrew-g2DYL2Zd6BY@public.gmane.org>
Cc: robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org, maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org, wens-jdAy2FN1RRM@public.gmane.org, linux-I+IVW8TIWO2tmTQ+vhA3Yw@public.gmane.org, peppe.cavallaro-qxv4g6HH51o@public.gmane.org, alexandre.torgue-qxv4g6HH51o@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, icenowy-h8G6r0blFSE@public.gmane.org
List-Id: devicetree@vger.kernel.org

On Fri, Jul 28, 2017 at 04:36:00PM +0200, Andrew Lunn wrote:
> > > I've probably asked this before: Does the internal PHY use a different
> > > PHY ID in registers 2 and 3?
> > > 
> > 
> > yes
> > 
> > reg2: 0x0044
> > reg3: 0X1500

Copy/paste error, its 1400

> 
> So this is not about loading the correct PHY driver. You can already
> do this based on the PHY IDs...
> 
> This is about selecting which PHY to use. Internal or External?	
> 
>      Andrew

It is too late when we know the PHY ID.
We need to set a syscon for choosing external/internal PHY.
So we can rely only on DT.