netdev - Re: Multiple DSA switch on shared MII

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Date:	Tue, 25 Nov 2014 21:22:39 -0800
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Rajib Karmakar <rajibkit@...il.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: Multiple DSA switch on shared MII

2014-11-25 20:52 GMT-08:00 Rajib Karmakar <rajibkit@...il.com>:
> Hello,
>
> I am developing a DSA driver for Marvell 6172 and need to create 2 dsa
> switch chip (one for WAN and one for LAN).

This is not typically how it is designed to work, you would register
one dsa switch chip with the ports assignment in this data structure.
Right now, DSA does not support a dual Ethernet MAC configuration,
although you could probably do per-port VLAN membership and create two
default VLANs to allow that.

>
> My device has 2 MACs and one shared mii_bus. I have added two
> dsa_platform_data structures and registered them but cannot probe as
> dsa_probe tries mdio_register() on the same bus and fails.
>
> Is it possible to create two DSA switch on same (shared) mii?

Not in its current form, and I am not exactly sure how we would support that.

>
> Regards,
> Rajib
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-- 
Florian
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