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Date:	Tue, 16 Mar 2010 21:28:40 -0700 (PDT)
From:	David Miller <>
Subject: Re: [PATCH] NET: Support clause 45 MDIO commands at the MDIO bus

From: Jason Gunthorpe <>
Date: Tue, 9 Mar 2010 12:17:42 -0700

> IEEE 802.3ae clause 45 specifies a somewhat modified MDIO protocol
> for use by 10GIGE phys. The main change is a 21 bit address split into
> a 5 bit device ID and a 16 bit register offset. The definition is designed
> so that normal and extended devices can run on the same MDIO bus.
> Extend mdio-bitbang to do the new protocol. At the MDIO bus level the
> protocol is requested by or'ing MII_ADDR_C45 into the register offset.
> Make phy_read/phy_write/etc pass a full 32 bit register offset.
> This does not attempt to make the phy layer support C45 style PHYs, just
> to provide the MDIO bus support.
> Tested against a Broadcom 10GE phy with ID 0x206034, and several
> Broadcom 10/100/1000 Phys in normal mode.
> Signed-off-by: Jason Gunthorpe <>

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