netdev - Re: XGMII support

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Date:	Thu, 12 Sep 2013 10:09:45 +0100
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Rayagond K <rayagond@...avyalabs.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: XGMII support

Hello,

2013/9/12 Rayagond K <rayagond@...avyalabs.com>:
> Hi All,
>
> I was going through include/linux/phy.h file to check what all phy
> interface Linux supports. The enum "phy_interface_t" has entry for
> MII, GMII, TBI, SGMII, RMII etc but I didn't find entry for XGMII
> interface.  So my questions are following,
>
> 1. How to support XGMII using phylib ?

phylib only needs to know about a phy_interface_t that is going to be
used by your Ethernet MAC adjust_link() callback to properly configure
the physical link between the MAC and the PHY. From a phylib
perspective there is no knowledge of how to configure based on the
*MII interface, this is the reponsibility of the Ethernet MAC driver
based on the "phydev->interface".

> 2. What are PHY_INTERFACE_MODE_RGMII_ID, PHY_INTERFACE_MODE_RGMII_RXID
> and PHY_INTERFACE_MODE_RGMII_TXID ?

They respectively stand for: "Reduced GMII with TX and RX internal
delay", "Reduced GMII with RX internal delay" and "Reduced GMII with
TX internal delay". In practice this is used when either the TX/RX or
both clocks and data lines needs to have a different phases (90
degrees in general).
-- 
Florian
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