netdev - Re: [PATCH net-next 2/4] net: stmmac: introduce PHY-less setup support

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Date:   Fri, 22 Apr 2022 14:58:49 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Ong Boon Leong <boon.leong.ong@...el.com>
Cc:     Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Paolo Abeni <pabeni@...hat.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 2/4] net: stmmac: introduce PHY-less setup
 support

On Fri, Apr 22, 2022 at 03:35:03PM +0800, Ong Boon Leong wrote:
> Certain platform uses PHY-less configuration whereby the MAC controller
> is connected to network switch chip directly over SGMII or 1000BASE-X.
> 
> This patch prepares the stmmac driver to support PHY-less configuration
> described above.

The normal way to do a PHY less setup is to use a fixed-PHY. It offers
the same API to the MAC as a real PHY but is fixed speed, dupex
etc. The MAC sees a PHY as usual, and you don't need anything special
in the MAC.

What you need to do is extend your DSD to list the fixed-link. See

https://www.kernel.org/doc/html/latest/firmware-guide/acpi/dsd/phy.html#mac-node-example-with-a-fixed-link-subnode

	Andrew