linux-kernel - [PATCH net-next v2 0/3] net: phy: dp83869: Support 1000Base-X SFP

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Message-Id: <20251110-sfp-1000basex-v2-0-dd5e8c1f5652@bootlin.com>
Date: Mon, 10 Nov 2025 10:24:52 +0100
From: Romain Gantois <romain.gantois@...tlin.com>
To: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>, 
 Russell King <linux@...linux.org.uk>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: Maxime Chevallier <maxime.chevallier@...tlin.com>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Romain Gantois <romain.gantois@...tlin.com>
Subject: [PATCH net-next v2 0/3] net: phy: dp83869: Support 1000Base-X SFP

Hi everyone,

This is version two of my series which adds support for using the DP83869
PHY as a transceiver between an RGMII upper MAC and a downstream 1000Base-X
SFP module.

Patch 1 and 2 of the series are necessary to get the PHY to properly switch its
operating mode to RGMII<->1000Base-X when an SFP module is inserted.

Patch 3 adds the actual SFP support, with only 1000Base-X modules supported for
now.

Side note: A wider-scoped series adding general SFP support to this PHY was sent
some time ago, but was not pursued, mainly due to complications with SGMII
support:

https://lore.kernel.org/netdev/20250514-dp83869-1000basex-v1-0-1bdb3c9c3d63@bootlin.com/

Best Regards,

Romain

Signed-off-by: Romain Gantois <romain.gantois@...tlin.com>
---
Changes in v2:
- Simplified module capability check.
- Fixed unchecked return value in configure_mode().
- Link to v1: https://lore.kernel.org/r/20251104-sfp-1000basex-v1-0-f461f170c74e@bootlin.com

---
Romain Gantois (3):
      net: phy: dp83869: Restart PHY when configuring mode
      net: phy: dp83869: ensure FORCE_LINK_GOOD is cleared
      net: phy: dp83869: Support 1000Base-X SFP

 drivers/net/phy/dp83869.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
---
base-commit: dd43cb8c0f1de74d7fa47913acbc2bc54672c6e0
change-id: 20251103-sfp-1000basex-a05c78484a54

Best regards,
-- 
Romain Gantois <romain.gantois@...tlin.com>