netdev - Re: [PATCH] Documentation: bindings: net: DPAA corenet binding document

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Date:	Tue, 2 Dec 2014 17:03:40 -0600
From:	Scott Wood <scottwood@...escale.com>
To:	Bucur Madalin-Cristian-B32716 <madalin.bucur@...escale.com>
CC:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Medve Emilian-EMMEDVE1 <Emilian.Medve@...escale.com>,
	Liberman Igal-B31950 <Igal.Liberman@...escale.com>,
	"galak@...eaurora.org" <galak@...eaurora.org>
Subject: Re: [PATCH] Documentation: bindings: net: DPAA corenet binding
 document

On Tue, 2014-12-02 at 06:12 -0600, Bucur Madalin-Cristian-B32716 wrote:
> > -----Original Message-----
> > From: Wood Scott-B07421
> > Sent: Tuesday, December 02, 2014 6:40 AM
> > On Fri, 2014-11-28 at 12:10 +0200, Madalin Bucur wrote:
> > > Add the device tree binding document for the DPAA corenet node
> > > and DPAA Ethernet nodes.
> > >
> > > Signed-off-by: Madalin Bucur <madalin.bucur@...escale.com>
> > > ---
> > >  Documentation/devicetree/bindings/net/fsl-dpaa.txt | 31
> > ++++++++++++++++++++++
> > >  1 file changed, 31 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/net/fsl-dpaa.txt
> > >
> > > diff --git a/Documentation/devicetree/bindings/net/fsl-dpaa.txt
> > b/Documentation/devicetree/bindings/net/fsl-dpaa.txt
> > > new file mode 100644
> > > index 0000000..822c668
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/net/fsl-dpaa.txt
> > > @@ -0,0 +1,31 @@
> > > +*DPAA corenet
> > > +
> > > +The corenet bus containing all DPAA Ethernet nodes.
> > 
> > What does this have to do with corenet?
> > 
> The corenet-generic platform code uses this compatible.

That doesn't make it a "corenet bus".  It's not a bus at all.

> > > +Required property
> > > + - compatible: string property.  Must include "fsl,dpaa". Can include
> > > +   also "fsl,<SoC>-dpaa".
> > 
> > No need for the <SoC> part.  As we previously discussed, the only
> > purpose of this node is backwards compatibility with the U-Boot MAC
> > address fixup -- if U-Boot doesn't look for the <SoC> version, then
> > don't complicate things.
> > 
> > Though, I can't find where U-Boot references this node.  Are you sure
> > it's not using the ethernet%d aliases like everything else, in which
> > case why do we need this node at all?
> > 
> > -Scott
> > 
> 
> The initial (Freescale SDK) binding document contained those compatibles,
> not sure what the initial intent was for the <SoC> variants.
> 
> The "fsl,dpaa" node is of interest to the DPAA Ethernet because it is
> the parent of the "fsl,dpa-ethernet" nodes.

I'm not interested in what the SDK binding says, or what the SDK kernel
does.  I'm interested in whether there's a U-Boot compatibility issue,
as was previously alleged.  If there isn't, then there's no need for
fsl,dpaa *or* fsl,dpa-ethernet.

-Scott


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