linux-kernel - Re: [PATCH net-next 2/3] net: nixge: Add support for having nixge as subdevice

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Date:   Thu, 30 Aug 2018 09:39:39 -0700
From:   Moritz Fischer <moritz.fischer@...us.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Kees Cook <keescook@...omium.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        netdev@...r.kernel.org, Alex Williams <alex.williams@...com>
Subject: Re: [PATCH net-next 2/3] net: nixge: Add support for having nixge as subdevice

Hi Andrew,

On Wed, Aug 29, 2018 at 8:11 PM, Andrew Lunn <andrew@...n.ch> wrote:

> Could you tell us more about the parent device. I'm guessing PCIe.  Is
> it x86 so no device tree? Are there cases where it does not have a PHY
> connected? What is connected instead? SFP? A switch? Can there be
> multiple PHYs on the MDIO bus?

The device is part of a larger FPGA design. One use case that I was trying
to support with this patch is PCIe with x86 (hopefully on it's own PF...)
Since the whole design isn't completely done, these are the use cases I
see upcoming and current:

ARM(64):
a) DT: PHY over MDIO (current use case), fixed-link with GPIO (coming)
b) DT: SFP (potentially coming)

x86:
a) no PHY (coming)-> fixed-link with GPIO
b) SFP (potentially), PHY over MDIO (potentially)

Thanks for your help,

Moritz