netdev - Re: [PATCH 7/9] net: mvmdio: add xmdio support

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Message-ID: <20170607144232.GA4173@kwain>
Date:   Wed, 7 Jun 2017 16:42:32 +0200
From:   Antoine Tenart <antoine.tenart@...e-electrons.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Antoine Tenart <antoine.tenart@...e-electrons.com>,
        davem@...emloft.net, jason@...edaemon.net,
        gregory.clement@...e-electrons.com,
        sebastian.hesselbarth@...il.com, f.fainelli@...il.com,
        thomas.petazzoni@...e-electrons.com, mw@...ihalf.com,
        linux@...linux.org.uk, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 7/9] net: mvmdio: add xmdio support

Hi Andrew,

On Wed, Jun 07, 2017 at 02:12:05PM +0200, Andrew Lunn wrote:
> On Wed, Jun 07, 2017 at 10:38:08AM +0200, Antoine Tenart wrote:
> > This patch adds the xMDIO interface support in the mvmdio driver. This
> > interface is used in Ethernet controllers on Marvell 370, 7k and 8k (as
> > of now). The xSMI interface supported by this driver complies with the
> > IEEE 802.3 clause 45 (while the SMI interface complies with the clause
> > 22). The xSMI interface is used by 10GbE devices.
> 
> I've only take a quick look, but i don't see anywhere you look at the
> register address and see if it has MII_ADDR_C45 to determine if a C45
> transaction should be done, or a C22. The MDIO bus can have a mix of
> C45 and C22 devices on it, and you need to use the correct transaction
> type depending on the target device/address.

So this could be dynamic and not based on the compatible. I'll try this
and see if it can work.

Thanks!

-- 
Antoine Ténart, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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