netdev - RE: [PATCH] ibm_newemac: Add support for GPCS, SGMII and M88E1112PHY

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Date:	Tue, 09 Sep 2008 17:12:40 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Victor Gallardo <vgallardo@...c.com>
Cc:	linuxppc-dev@...abs.org, Feng Kan <fkan@...c.com>,
	netdev@...r.kernel.org
Subject: RE: [PATCH] ibm_newemac: Add support for GPCS, SGMII and
	M88E1112PHY

On Sun, 2008-09-07 at 22:57 -0700, Victor Gallardo wrote:
> Hello Benjamin,
>  
> On the 460EX/GT in SGMII mode, GPCS access is needed for communication with the internal SGMII SerDes. It is possible that there is still a PHY. So we need a way to access both addresses.
>  
> For Example on the AMCC Arches Board.
>  
> EMAC 0 has only a GPCS PHY (address 0xA)
> EMAC 1 has M88E1112 PHY (address 0x0) and GPCS PHY (address 0xB)
> EMAC 2 has M88E1112 PHY (address 0x1) and GPCS PHY (address 0xC)

Ok. Thanks. I need to review your patch a bit better, hopefully later
this week. I'll let you know. Ping me if you get no news by next monday.

Cheers,
Ben.

> Regards,
>  
> Victor Gallardo
> 
> ________________________________
> 
> From: Benjamin Herrenschmidt [mailto:benh@...nel.crashing.org]
> Sent: Sun 9/7/2008 5:29 PM
> To: Victor Gallardo
> Cc: linuxppc-dev@...abs.org; Feng Kan
> Subject: Re: [PATCH] ibm_newemac: Add support for GPCS, SGMII and M88E1112PHY
> 
> 
> 
> On Fri, 2008-09-05 at 16:52 -0700, Victor Gallardo wrote:
> > From: Victor Gallardo <vgallardo@...c.com>
> >
> > This patch adds GPCS, SGMII and M88E1112 PHY support
> > for the AMCC PPC460GT/EX processors.
> 
> So if I understand the patch correctly, either there is an *MII PHY in
> which case phy_address is used, or there's a GPCS one and phy_address is
> -1 and gpcs_address is used right ?
> 
> Why not instead always use phy_address, and have a flag indicating
> whether it's an MII or GPCS PHY ? This would avoid the added
> gpcs_read/write functions, among other things, and I believe would look
> cleaner... Or am I missing something ?
> 
> Cheers,
> Ben.
> 
> 
> 
> 

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