linux-kernel - Re: [PATCH 1/2] of_mdio: add new DT property 'link' for fixed-link

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Date:	Fri, 10 Jul 2015 14:20:17 +0300
From:	Stas Sergeev <stsp@...t.ru>
To:	Sebastien Rannou <mxs@...k.org>
CC:	Florian Fainelli <f.fainelli@...il.com>,
	Linux kernel <linux-kernel@...r.kernel.org>,
	Arnaud Ebalard <arno@...isbad.org>,
	Stas Sergeev <stsp@...rs.sourceforge.net>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	devicetree@...r.kernel.org, netdev <netdev@...r.kernel.org>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Subject: Re: [PATCH 1/2] of_mdio: add new DT property 'link' for fixed-link

10.07.2015 11:46, Sebastien Rannou пишет:
> On Fri, 10 Jul 2015, Stas Sergeev wrote:
> 
>> 10.07.2015 00:15, Florian Fainelli пишет:
>>> Then, if the in-band status indication is not reliable (which really
>>> should be completely understood),
>> Agree!
>> But this is not something I can help with.
>> Sebastien Rannou reports the problem, please ask him whatever
>> you see fits to get a better understanding of a problem.
>> The fact that his HW does not generate the inband status, is
>> _my own guess_.
> 
> Yes, I confirm that my HW does not generate an in-band status. AFAIK, it's
> a PHY that aggregates 4xSGMIIs to 1xQSGMII ; the MAC side of the PHY (with
> inband status) is connected to the switch through QSGMII, and in this context
> we are on the media side of the PHY.
Hmm, interesting.
So if I parse the above correctly, you have something like 88E1340S set
up into a mode when SGMII is used as media interface and QSGMII as system
interface (terms are from datasheet page 5), then you connect the media
interface to armada-xp and system interface to the switch.

I wonder if it is the right thing to do.
AFAIK you could as well set up armada-xp into QSGMII mode and connect
that to switch. The driver would then disable the use of inband status
and everything would be fine.
Either way, your use-case proves that only DT can decide the use of an
inband status.
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