linux-kernel - Re: [PATCH net-next 1/3] net: phy: Add binding for vendor specific C45 MDIO address space

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Date:   Tue, 17 Apr 2018 20:27:41 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     vicentiu.galanopulo@....com, robh@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        mark.rutland@....com, davem@...emloft.net, marcel@...tmann.org,
        devicetree@...r.kernel.org, alexandru.marginean@....com,
        madalin.bucur@....com
Subject: Re: [PATCH net-next 1/3] net: phy: Add binding for vendor specific
 C45 MDIO address space

On Tue, Apr 17, 2018 at 11:18:20AM -0700, Florian Fainelli wrote:
> On 04/17/2018 02:02 AM, Vicentiu Galanopulo wrote:
> > The extra property enables the discovery on the MDIO bus
> > of the PHYs which have a vendor specific address space
> > for accessing the C45 MDIO registers.
> > 
> > Signed-off-by: Vicentiu Galanopulo <vicentiu.galanopulo@....com>
> > ---
> >  Documentation/devicetree/bindings/net/phy.txt | 6 ++++++
> >  1 file changed, 6 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/net/phy.txt b/Documentation/devicetree/bindings/net/phy.txt
> > index d2169a5..82692e2 100644
> > --- a/Documentation/devicetree/bindings/net/phy.txt
> > +++ b/Documentation/devicetree/bindings/net/phy.txt
> > @@ -61,6 +61,11 @@ Optional Properties:
> >  - reset-deassert-us: Delay after the reset was deasserted in microseconds.
> >    If this property is missing the delay will be skipped.
> >  
> > +- dev-addr: If set, it indicates the device address of the PHY to be used
> > +  when accessing the C45 PHY registers over MDIO. It is used for vendor specific
> > +  register space addresses that do no conform to standard address for the MDIO
> > +  registers (e.g. MMD30)
> 
> Rob made that comment earlier, and I have to ask again now, why don't we
> have the Clause 45 PHY binding be modified such that you have a reg
> property that has #address-size = 2? This should be entirely backwards
> compatible, but it would allow you to specify that device address in a
> more traditional way.

Hi Florian

I think we might get into trouble when we have both c22 and c45 on the
same bus. Two different reg formats. I would have to try it and see to
be sure.

     Andrew