netdev - Re: DSA driver - how to glue to a PCI based NIC's mdio?

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Message-ID: <20150930211210.GD20219@lunn.ch>
Date:	Wed, 30 Sep 2015 23:12:10 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Tim Harvey <tharvey@...eworks.com>
Cc:	netdev <netdev@...r.kernel.org>, David Miller <davem@...emloft.net>
Subject: Re: DSA driver - how to glue to a PCI based NIC's mdio?

On Wed, Sep 30, 2015 at 01:44:52PM -0700, Tim Harvey wrote:
> Greetings,
> 
> I'm working on adding DSA support for a PCIe expansion card (designed
> by us) that has common PCIe NIC connected via its mii-bus to a Marvell
> MV88E6171. Because the NIC is a PCIe device, it has no device-tree
> representation of its NIC or its mdio bus, but does register its mdio
> bus with Linux.

It is possible to represent PCIe devices in device tree. Take a look
at ePAPR. Is the PCIe host in DT?

> Perhaps the right approach is to program the NIC's EEPROM on our board
> with a PCI_ID/DEVICE_ID of ours, add support for those ID's to the
> NIC's driver, and within the NIC's driver create and register dsa
> platform device when our ID is encountered?

This sounds sensible. But i doubt you can add your DSA platform
information to the NIC's device driver. Better would be to have a
small shim driver which is loaded on your PCI_ID/DEVICE_ID. That would
instantiate the NIC driver, and insert a DSA platform device.

    Andrew
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