linux-kernel - Re: [PATCH] dt: Document a compatible entry for MDIO ethernet Phys

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Message-ID: <20140108211610.GC12358@obsidianresearch.com>
Date:	Wed, 8 Jan 2014 14:16:10 -0700
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Rob Herring <robherring2@...il.com>
Cc:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH] dt: Document a compatible entry for MDIO ethernet Phys

On Wed, Jan 08, 2014 at 12:37:03PM -0600, Rob Herring wrote:

> > Patch to parse this compatible string to follow if this binding is
> > acceptable.
> 
> One minor comment below, otherwise:
> 
> Acked-by: Rob Herring <robh@...nel.org>

K, I'll send a series hopefully in a few weeks after some travel.
 
> > +  If the phy's identifier is known then the list may contain an entry
> > +  of the form: "ethernet-phy-idAAAA,BBBB" where
> 
> I think this should be a period rather than a comma as we are not
> separating a vendor ID from product ID.

OK, that makes sense.

Inspecting further, the format of the 32 bit AAAABBBB is actually
broken out into:
  OUI[3:18] || OUI[19:24] || MODEL[5:0] || REV[3:0]

So a possible choice with the 'vendor ID,product ID' split is:
  ethernet-phyOOOOO,MM.R

xlate is:

AAAABBBB = ((OOOOO >> 6) << 16) |
           ((OOOOO & 0x3f) << 10) |
           (MM << 4) |
      	   R

Which doesn't textually match the register value, or any other
phy ID constants in the kernel, however makes more sense from the
'vendor ID,product ID' angle.

Eg a Marvell 88E1310 would encode into the two options as:
  ethernet-phy05043,29.0
  ethernet-phy-id0141.0e90

And the kernel has constants like this:
include/linux/marvell_phy.h:#define MARVELL_PHY_ID_88E1318S 0x01410e90

In light of this detail do you still like 'ethernet-phy-id0141.0e90' ?

Thanks,
Jason
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