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From: Kurt Kanzenbach <kurt@linutronix.de>
To: Andrew Lunn <andrew@lunn.ch>
Cc: Vivien Didelot <vivien.didelot@gmail.com>,
	Florian Fainelli <f.fainelli@gmail.com>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	netdev@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
	devicetree@vger.kernel.org,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Richard Cochran <richardcochran@gmail.com>,
	Kamil Alkhouri <kamil.alkhouri@hs-offenburg.de>,
	ilias.apalodimas@linaro.org
Subject: Re: [RFC PATCH 9/9] dt-bindings: net: dsa: Add documentation for Hellcreek switches
Date: Mon, 22 Jun 2020 14:02:19 +0200	[thread overview]
Message-ID: <87imfjtik4.fsf@kurt> (raw)
In-Reply-To: <20200619135657.GF304147@lunn.ch>

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On Fri Jun 19 2020, Andrew Lunn wrote:
>> > The switch is 100/100Mbps right? The MAC is only Fast ethernet. Do you
>> > need some properties in the port@0 node to tell the switch to only use
>> > 100Mbps? I would expect it to default to 1G. Not looked at the code
>> > yet...
>> 
>> No, that is not needed. That is a hardware configuration and AFAIK
>> cannot be changed at run time.
>
> I was wondering about that in general. I did not spot any code in the
> driver dealing with results from the PHY auto-neg. So you are saying
> the CPU is fixed speed, by strapping? But what about the other ports?
> Does the MAC need to know the PHY has negotiated 10Half, not 1G? Would
> that not make a difference to your TSN?

Indeed, that does make a difference. I've checked with the vendor. The
current version of the switch IP does not support configuring the speed
etc. at run time. It is hard wired to 100 Mbit/s or 1000 Mbit/s for
now. Later versions of the chip might support setting the speed etc. via
configuration registers. As a result the PHYs at the front ports should
be programmed to only advertise 100 Mbit/s or 1G depending on the
hardware setup.

Thanks,
Kurt

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  reply	other threads:[~2020-06-22 12:02 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-18  6:40 [RFC PATCH 0/9] Hirschmann Hellcreek DSA driver Kurt Kanzenbach
2020-06-18  6:40 ` [RFC PATCH 1/9] net: dsa: Add tag handling for Hirschmann Hellcreek switches Kurt Kanzenbach
2020-06-18 13:42   ` Andrew Lunn
2020-06-18  6:40 ` [RFC PATCH 2/9] net: dsa: Add DSA driver " Kurt Kanzenbach
2020-06-18 15:22   ` Andrew Lunn
2020-06-19  8:12     ` Kurt Kanzenbach
2020-06-18  6:40 ` [RFC PATCH 3/9] net: dsa: hellcreek: Add PTP clock support Kurt Kanzenbach
2020-06-18 15:46   ` Jakub Kicinski
2020-06-19  8:13     ` Kurt Kanzenbach
2020-06-18 17:23   ` Andrew Lunn
2020-06-19  8:26     ` Kurt Kanzenbach
2020-06-19 13:40       ` Andrew Lunn
2020-06-22 11:52         ` Kurt Kanzenbach
2020-06-24 13:03   ` Richard Cochran
2020-06-25  7:08     ` Kurt Kanzenbach
2020-06-18  6:40 ` [RFC PATCH 4/9] net: dsa: hellcreek: Add support for hardware timestamping Kurt Kanzenbach
2020-06-18  6:40 ` [RFC PATCH 5/9] net: dsa: hellcreek: Add TAPRIO offloading support Kurt Kanzenbach
2020-06-18  6:40 ` [RFC PATCH 6/9] net: dsa: hellcreek: Add debugging mechanisms Kurt Kanzenbach
2020-06-18 17:34   ` Andrew Lunn
2020-06-19  8:36     ` Kurt Kanzenbach
2020-06-19 13:42       ` Andrew Lunn
2020-06-22 12:32         ` Kurt Kanzenbach
2020-06-22 13:55           ` Andrew Lunn
2020-06-23  6:07             ` Kurt Kanzenbach
2020-06-22 14:14           ` Vladimir Oltean
2020-06-23  6:04             ` Kurt Kanzenbach
2020-06-18  6:40 ` [RFC PATCH 7/9] net: dsa: hellcreek: Add PTP status LEDs Kurt Kanzenbach
2020-06-18 17:46   ` Andrew Lunn
2020-06-19  8:45     ` Kurt Kanzenbach
2020-06-19 13:52       ` Andrew Lunn
2020-06-18  6:40 ` [RFC PATCH 8/9] dt-bindings: Add vendor prefix for Hirschmann Kurt Kanzenbach
2020-06-18  6:40 ` [RFC PATCH 9/9] dt-bindings: net: dsa: Add documentation for Hellcreek switches Kurt Kanzenbach
2020-06-18 13:47   ` Andrew Lunn
2020-06-19  8:47     ` Kurt Kanzenbach
2020-06-19 13:56       ` Andrew Lunn
2020-06-22 12:02         ` Kurt Kanzenbach [this message]
2020-06-22 13:49           ` Andrew Lunn
2020-06-23  6:09             ` Kurt Kanzenbach
2020-06-18 17:40   ` Florian Fainelli
2020-06-19  8:48     ` Kurt Kanzenbach
2020-06-22 12:05       ` Kurt Kanzenbach
2020-06-26 17:11         ` Florian Fainelli

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