netdev - Re: [PATCH net-next v3 5/5] net: documentation: add docs for MAC/PHY support in DPAA2

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Date:   Tue, 29 Oct 2019 03:08:10 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Ioana Ciornei <ioana.ciornei@....com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        laurentiu.tudor@....com, f.fainelli@...il.com,
        linux@...linux.org.uk
Subject: Re: [PATCH net-next v3 5/5] net: documentation: add docs for MAC/PHY
 support in DPAA2

> +DPAA2 Software Architecture
> +---------------------------
> +
> +Among other DPAA2 objects, the fsl-mc bus exports DPNI objects (abstracting a
> +network interface) and DPMAC objects (abstracting a MAC). The dpaa2-eth driver
> +probes on the DPNI object and connects to and configures a DPMAC object with
> +the help of phylink.

Does a DPMAC object always connect to a PHY? Can a DPMAC connect to
another DPMAC? I guess you would not normally do that, you would
connect a DPNI to a DPNI? But can you connect a DPMAC to a switch?

I guess it actually does not matter. Phylib/Phylink has the concept of
a fixed-link, which is used when there is no PHY and you need to
emulate it in order to configure the MAC. That will work here.

	Andrew