Re: [PATCH v2] ARM: omap3: beagleboard-xm: dt: Add ethernet to the device tree

[Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>]

* Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> [170105 10:51]:
> On Thu, Jan 5, 2017 at 10:48 AM, Laurent Pinchart
> <laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org> wrote:
> > Hello,
> >
> > On Thursday 05 Jan 2017 08:39:29 Tony Lindgren wrote:
> >> * Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> [170105 08:28]:
> >> > On Fri, Dec 2, 2016 at 3:11 PM, Laurent Pinchart wrote:
> >> >> The Beagleboard-xM has a LAN9514 USB hub and ethernet controller,
> >> >> connected to port 2 of the OMAP EHCI controller. The board however has
> >> >> no EEPROM to store the ethernet MAC address, which is programmed by the
> >> >> boot loader.
> >> >>
> >> >> To allow Linux to use the same MAC address as the boot loader (or for
> >> >> that matter any fixed MAC address), we need a node in the device tree
> >> >> for the ethernet controller that the boot loader can update at runtime
> >> >> with a local-mac-address property. Add it, along with an alias for the
> >> >> ethernet controller to let the boot loader locate it easily.
> >> >>
> >> >> Signed-off-by: Laurent Pinchart <laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>
> >> >> ---
> >> >> Changes since v1:
> >> >>
> >> >> - Renamed usb2 DT node to hub
> >> >> ---
> >> >>
> >> >>  arch/arm/boot/dts/omap3-beagle-xm.dts | 16 ++++++++++++++++
> >> >>  1 file changed, 16 insertions(+)
> >> >>
> >> >> diff --git a/arch/arm/boot/dts/omap3-beagle-xm.dts
> >> >> b/arch/arm/boot/dts/omap3-beagle-xm.dts index
> >> >> 85e297ed0ea1..673cee2234b2 100644
> >> >> --- a/arch/arm/boot/dts/omap3-beagle-xm.dts
> >> >> +++ b/arch/arm/boot/dts/omap3-beagle-xm.dts
> >> >> @@ -27,6 +27,7 @@
> >> >>         aliases {
> >> >>                 display0 = &dvi0;
> >> >>                 display1 = &tv0;
> >> >> +               ethernet = &ethernet;
> >> >
> >> > Sorry, just noticed this, but this should be dropped. It's not used
> >> > nor do we want an alias here.
> >>
> >> OK, will update locally as I have not pushed out yet.
> >
> > The ethernet alias is used by U-Boot to locate the ethernet controller and
> > update the MAC address.
> 
> Okay. Though with only only one, I don't see why that is hard to find.
> Anyway, this is the least of u-boot's DT abuses.

Applying Laurent's original patch then into omap-for-v4.11/dt.

Tony
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