Re: [PATCH] dt: Document a compatible entry for MDIO ethernet Phys
From: Rob Herring
Date: Thu Jan 16 2014 - 16:31:02 EST
On Wed, Jan 8, 2014 at 3:16 PM, Jason Gunthorpe
> 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@xxxxxxxxxx>
> 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:
> xlate is:
> AAAABBBB = ((OOOOO >> 6) << 16) |
> ((OOOOO & 0x3f) << 10) |
> (MM << 4) |
> 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:
> 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' ?
I'm fine either way. Separating out the OUI had crossed my mind. That
probably does make the value in the DT more meaningful. Is the OUI
used anywhere in the kernel?
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