[PATCH net-next v2 0/9] Allow isolating PHY devices

[Maxime Chevallier <maxime.chevallier@bootlin.com>]

Hello,

This is the V2 of a series to add isolation support for PHY devices.

As a remainder, this mode allows a PHY to set its MII lines in
high-impedance mode to avoid interferences on this bus.

So far, I've identified that :

 - Marvell 88e1512 isolation works fine
 - LXT973 claims to support isolation, but it's actually broken
 - Marvell 88x3310 doesn't support isolation, by design
 - Marvell 88e1111 claims to support isolation in GMII, RGMII, TBI
   (untested) but doesn't in SGMII (tested).

Changes in V2 :

 - Removed the loopback mode that was included in the first iteration
 - Added phy_shutdown, to make sure we de-isolate the PHY when rebooting
 - Changes the "PHY_NO_ISOLATE" flag to a phy driver ops. Testing showed
   that some PHYs may or may not support isolation based on the
   interface that's being used.
 - Added isolation support reporting for the Marvell 88e1111 PHY.

V1 : https://lore.kernel.org/netdev/20240911212713.2178943-1-maxime.chevallier@bootlin.com/

Maxime Chevallier (9):
  net: phy: allow isolating PHY devices
  net: phy: Introduce phy_shutdown for device quiescence.
  net: phy: Allow PHY drivers to report isolation support
  net: phy: lxt: Mark LXT973 PHYs as having a broken isolate mode
  net: phy: marvell10g: 88x3310 and 88x3340 don't support isolate mode
  net: phy: marvell: mv88e1111 doesn't support isolate in SGMII mode
  net: phy: introduce ethtool_phy_ops to get and set phy configuration
  net: ethtool: phy: allow reporting and setting the phy isolate status
  netlink: specs: introduce phy-set command along with configurable
    attributes

 Documentation/netlink/specs/ethtool.yaml     |  15 +++
 Documentation/networking/ethtool-netlink.rst |   1 +
 drivers/net/phy/lxt.c                        |   2 +
 drivers/net/phy/marvell.c                    |   9 ++
 drivers/net/phy/marvell10g.c                 |   2 +
 drivers/net/phy/phy.c                        |  44 ++++++++
 drivers/net/phy/phy_device.c                 | 101 +++++++++++++++++--
 include/linux/ethtool.h                      |   8 ++
 include/linux/phy.h                          |  42 ++++++++
 include/uapi/linux/ethtool_netlink.h         |   2 +
 net/ethtool/netlink.c                        |   8 ++
 net/ethtool/netlink.h                        |   1 +
 net/ethtool/phy.c                            |  68 +++++++++++++
 13 files changed, 297 insertions(+), 6 deletions(-)

-- 
2.46.1