netdev - Re: [PATCH 2/3] net: macb: add support for C45 MDIO read/write

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Date:   Wed, 27 Nov 2019 19:51:29 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Nicolas.Ferre@...rochip.com
Cc:     mparab@...ence.com, antoine.tenart@...tlin.com,
        davem@...emloft.net, netdev@...r.kernel.org, f.fainelli@...il.com,
        hkallweit1@...il.com, linux-kernel@...r.kernel.org,
        dkangude@...ence.com, pthombar@...ence.com,
        rmk+kernel@....linux.org.uk
Subject: Re: [PATCH 2/3] net: macb: add support for C45 MDIO read/write

On Wed, Nov 27, 2019 at 06:31:54PM +0000, Nicolas.Ferre@...rochip.com wrote:
> On 26/11/2019 at 15:37, Andrew Lunn wrote:
> > On Tue, Nov 26, 2019 at 09:09:49AM +0000, Milind Parab wrote:
> >> This patch modify MDIO read/write functions to support
> >> communication with C45 PHY.
> > 
> > I think i've asked this before, at least once, but you have not added
> > it to the commit messages. Do all generations of the macb support C45?
> 
> For what I can tell from the different IP revisions that we implemented 
> throughout the years in Atmel then Microchip products (back to 
> at91rm9200 and at91sam9263), it seems yes.
> 
> The "PHY Maintenance Register" "MACB_MAN_*" was always present with the 
> same bits 32-28 layout (with somehow different names).
> 
> But definitively we would need to hear that from Cadence itself which 
> would be far better.

Hi Nicolas

Thanks, that is useful.

I'm just trying to avoid backward compatibility issues, somebody
issues a C45 request on old silicon and it all goes horribly wrong.

       Andrew