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From: Andrew Lunn <andrew@lunn.ch>
To: Harini Katakam <harinik@xilinx.com>
Cc: Harini Katakam <harini.katakam@xilinx.com>,
	Nicolas Ferre <nicolas.ferre@microchip.com>,
	David Miller <davem@davemloft.net>,
	Claudiu Beznea <claudiu.beznea@microchip.com>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	Michal Simek <michal.simek@xilinx.com>,
	devicetree@vger.kernel.org
Subject: Re: [RFC PATCH 1/2] dt-bindings: net: macb: Add new property for PS SGMII only
Date: Mon, 5 Aug 2019 15:20:45 +0200	[thread overview]
Message-ID: <20190805132045.GC24275@lunn.ch> (raw)
In-Reply-To: <CAFcVECL6cvCjeo+fn1NDyMDZyZXDrWyhD9djvcVXiLVLiLgGeA@mail.gmail.com>

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@lunn.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?

       Andrew

  reply	other threads:[~2019-08-05 13:20 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-31  9:40 [RFC PATCH 0/2] Macb SGMII status poll thread Harini Katakam
2019-07-31  9:40 ` [RFC PATCH 1/2] dt-bindings: net: macb: Add new property for PS SGMII only Harini Katakam
2019-08-04 14:56   ` Andrew Lunn
2019-08-05  6:15     ` Harini Katakam
2019-08-05 13:20       ` Andrew Lunn [this message]
2019-08-05 14:36         ` Harini Katakam
2019-08-05 16:10           ` Harini Katakam
2019-08-05 17:16             ` Andrew Lunn
2019-08-06  5:47               ` Harini Katakam
2019-07-31  9:40 ` [RFC PATCH 2/2] net: macb: Add SGMII poll thread Harini Katakam

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