linux-kernel - Re: [PATCH 2/2] dt-bindings: net: dsa: qca8k: Add PORT0_PAD

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Message-ID: <20200718144435.GA1375379@lunn.ch>
Date:   Sat, 18 Jul 2020 16:44:35 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     John Crispin <john@...ozen.org>,
        Matthew Hagan <mnhagan88@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jonathan McDowell <noodles@...th.li>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH 2/2] dt-bindings: net: dsa: qca8k: Add PORT0_PAD_CTRL
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On Sat, Jul 18, 2020 at 02:20:11PM +0100, Russell King - ARM Linux admin wrote:
> On Fri, Jul 17, 2020 at 10:44:19PM +0200, John Crispin wrote:
> > in regards to the sgmii clk skew. I never understood the electrics fully I
> > am afraid, but without the patch it simply does not work. my eletcric foo is
> > unfortunately is not sufficient to understand the "whys" I am afraid.
> 
> Do you happen to know what frequency the clock is?  Is it 1.25GHz or
> 625MHz?  It sounds like it may be 1.25GHz if the edge is important.

I'm also a bit clueless when it comes to these systems.

I thought the clock was embedded into the SERDES signal? You recover
it from the signal?

Florian, does the switch have a separate clock input/output?

   Andrew