netdev - Re: DSA with MV88E6321 and imx28

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Date:   Thu, 6 Jun 2019 11:39:33 +0200
From:   Benjamin Beckmeyer <beb@...-engel.de>
To:     Andrew Lunn <andrew@...n.ch>
CC:     <netdev@...r.kernel.org>
Subject: Re: DSA with MV88E6321 and imx28

>> I removed all phy-handle for the internal ports and in the mdio part 
>> is only port 2 and 6 by now. But the Serdes ports are still not be
>> recognized. So maybe there is still something wrong?
> What do you mean by SERDES? Do you mean they are connected to an SFP
> cage? If so, you need to add an SFP node. Take a look at
> vf610-zii-dev-rev-c.dts for an example.
>
> 	Andrew

Hey Andrew,
I've looked into the device tree. Why do they reference to i2c? We have
1x8 SFF tranceivers. Should I just add an i2c entry for it, because the 
value is required?

Now I don't have anything in the mdio part but the serdes ports are not 
recognized. Do I have to activate them in any kind? When I read the PHY
0 register of the serdes port 0 (SMI address 0xc) it is in power down mode.
Is there a problem with the mapping? Internally these serdes port PHYs are
at 0x0c and 0x0d but mapped to 0x0 and 0x1, for me this can be a reason 
why it won't be found. Is there a switch comparable to this mapping?
Maybe I'm totally wrong and misunderstanding something here?

Do you know which switch chip they use in the  vf610-zii-dev-rev-c?

Benjamin