netdev - [PATCH net-next v2 0/2] net: phy: sfp: Add single-byte SMBus SFP access

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Message-ID: <20250225112043.419189-1-maxime.chevallier@bootlin.com>
Date: Tue, 25 Feb 2025 12:20:38 +0100
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: davem@...emloft.net,
	Andrew Lunn <andrew@...n.ch>,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Russell King <linux@...linux.org.uk>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: Maxime Chevallier <maxime.chevallier@...tlin.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	thomas.petazzoni@...tlin.com,
	Florian Fainelli <f.fainelli@...il.com>,
	Köry Maincent <kory.maincent@...tlin.com>,
	Simon Horman <horms@...nel.org>,
	Romain Gantois <romain.gantois@...tlin.com>,
	Antoine Tenart <atenart@...nel.org>,
	Marek Behún <kabel@...nel.org>,
	Sean Anderson <sean.anderson@...ux.dev>,
	Bjørn Mork <bjorn@...k.no>
Subject: [PATCH net-next v2 0/2] net: phy: sfp: Add single-byte SMBus SFP access

Hello everyone,

This is V2 for the single-byte SMBus support for SFP cages as well as
embedded PHYs accessed over mdio-i2c.

Discussions in V1 [1] with Russell and Andrew showed that we should be mor
conservative with SMBus access, as it is either stated as non-compliant
with SFF-8472 for diag data, or simply blurry as to how well this will work
with Copper modules.

Tests on a variety of modules show that it looks OK however this is
really not enough to guarantee that it will work with all modules, so in
this V2 we :
 - Disable hwmon
 - Print a big warning indicating that it may not work as expected, but
   more importantly that the kernel isn't to blame, but rather the HW
   design.

I've added Sean's tested-by tags, I hope that's OK given I've added the
new flag to disable hwmon.

V1 ([1]): https://lore.kernel.org/netdev/20250223172848.1098621-1-maxime.chevallier@bootlin.com/#t

Maxime Chevallier (2):
  net: phy: sfp: Add support for SMBus module access
  net: mdio: mdio-i2c: Add support for single-byte SMBus operations

 drivers/net/mdio/mdio-i2c.c | 79 ++++++++++++++++++++++++++++++++++++-
 drivers/net/phy/sfp.c       | 79 ++++++++++++++++++++++++++++++++++---
 2 files changed, 151 insertions(+), 7 deletions(-)

-- 
2.48.1