netdev - Re: [RFC PATCH 1/2] dt-bindings: net: macb: Add new property for PS SGMII only

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Date:   Mon, 5 Aug 2019 20:06:51 +0530
From:   Harini Katakam <harinik@...inx.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Harini Katakam <harini.katakam@...inx.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        David Miller <davem@...emloft.net>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Michal Simek <michal.simek@...inx.com>,
        devicetree@...r.kernel.org
Subject: Re: [RFC PATCH 1/2] dt-bindings: net: macb: Add new property for PS
 SGMII only

Hi Andrew,

On Mon, Aug 5, 2019 at 7:00 PM Andrew Lunn <andrew@...n.ch> wrote:
>
> On Mon, Aug 05, 2019 at 11:45:05AM +0530, Harini Katakam wrote:
> > Hi Andrew,
> >
> > On Sun, Aug 4, 2019 at 8:26 PM Andrew Lunn <andrew@...n.ch> wrote:
> > >
> > > On Wed, Jul 31, 2019 at 03:10:32PM +0530, Harini Katakam wrote:
> > > > Add a new property to indicate when PS SGMII is used with NO
> > > > external PHY on board.
> > >
> > > Hi Harini
> > >
> > > What exactly is you use case? Are you connecting to a Ethernet switch?
> > > To an SFP cage with a copper module?
> >
> > Yes, an SFP cage is the common HW target for this patch.
>
> Hi Harini
>
> So you have a copper PHY in the SFP cage. It will talk SGMII
> signalling to your PS SGMII. When that signalling is complete i would
> expect the MAC to raise an interrupt, just as if the SGMII PHY was
> soldered on the board. So i don't see why you need this polling?
>

Thanks. Sorry, I overlooked this interrupt. Let me try that.

Regards,
Harini