From: Andrew Lunn <andrew@lunn.ch>
To: "Måns Rullgård" <mans@mansr.com>
Cc: Mason <slash.tmp@free.fr>, netdev <netdev@vger.kernel.org>,
Florian Fainelli <f.fainelli@gmail.com>,
Timur Tabi <timur@codeaurora.org>,
Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>,
Zefir Kurtisi <zefir.kurtisi@neratec.com>,
Martin Blumenstingl <martin.blumenstingl@gmail.com>,
Uwe Kleine-Konig <u.kleine-koenig@pengutronix.de>,
Daniel Mack <zonque@gmail.com>,
Sebastian Frias <sf84@laposte.net>
Subject: Re: Ethernet not working on a different SoC with same eth HW
Date: Fri, 4 Nov 2016 16:17:44 +0100 [thread overview]
Message-ID: <20161104151744.GG3600@lunn.ch> (raw)
In-Reply-To: <yw1xpombjnfn.fsf@unicorn.mansr.com>
On Fri, Nov 04, 2016 at 03:05:00PM +0000, Måns Rullgård wrote:
> Andrew Lunn <andrew@lunn.ch> writes:
>
> >> > I agree with you. But fixing it is likely to break boards which
> >> > currently have "rgmii", but actually need the delay in order to work.
> >>
> >> Does the internal delay here refer to the PHY or the MAC? It's a
> >> property of the MAC node after all.
> >
> > It is the PHY which applies the delay.
>
> Says who?
The source code.
> Some MACs can do it too.
I'm sure they can. But look at the code. Nearly none do, and those
that do are potentially broken.
> There is also no way to specify the amount of delay required even though
> many devices support more than one value.
Those PHYs that which support variable delays add there own device
tree properties. See for example Micrel KSZ9021/KSZ9031 Gigabit Ethernet PHY
Andrew
next prev parent reply other threads:[~2016-11-04 15:17 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-31 15:29 Ethernet not working on a different SoC with same eth HW Mason
2016-10-31 15:37 ` Andrew Lunn
2016-10-31 15:48 ` Mason
2016-10-31 15:53 ` Andrew Lunn
2016-10-31 16:28 ` Mason
2016-11-04 13:01 ` Mason
2016-11-04 13:40 ` Måns Rullgård
2016-11-04 13:51 ` Mason
2016-11-04 13:57 ` Andrew Lunn
2016-11-04 14:01 ` Sebastian Frias
2016-11-04 14:04 ` Måns Rullgård
2016-11-04 14:13 ` Mason
2016-11-04 14:22 ` Andrew Lunn
2016-11-04 15:05 ` Måns Rullgård
2016-11-04 15:17 ` Andrew Lunn [this message]
2016-11-04 15:22 ` Måns Rullgård
2016-11-04 16:45 ` Florian Fainelli
2016-11-04 16:55 ` Måns Rullgård
2016-11-04 17:06 ` Mason
2016-10-31 15:39 ` Andrew Lunn
2016-11-08 15:41 ` Mason
2016-11-09 17:38 ` Mason
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