linux-kernel - Aquantia PHY in OCSGMII mode?

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Message-ID: <aIuEvaSCIQdJWcZx@FUE-ALEWI-WINX>
Date: Thu, 31 Jul 2025 16:59:09 +0200
From: Alexander Wilhelm <alexander.wilhelm@...termo.com>
To: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc: Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Aquantia PHY in OCSGMII mode?

Hello devs,

I'm fairly new to Ethernet PHY drivers and would appreciate your help. I'm
working with the Aquantia AQR115 PHY. The existing driver already supports the
AQR115C, so I reused that code for the AQR115, assuming minimal differences. My
goal is to enable 2.5G link speed. The PHY supports OCSGMII mode, which seems to
be non-standard.

* Is it possible to use this mode with the current driver?
* If yes, what would be the correct DTS entry?
* If not, I’d be willing to implement support. Could you suggest a good starting point?

Any hints or guidance would be greatly appreciated.

Best regards
Alexander Wilhelm