[RFC PATCH v2 net-next 0/5] Let phylink manage in-band AN for the PHY

[Vladimir Oltean <vladimir.oltean@nxp.com>]

This small series creates a configuration knob for PHY drivers which use
serial MII-side interfaces and support clause 37 in-band auto-negotiation
there.

Changes in v2:
Incorporated feedback from Russell, which was to consider PHYs on SFP
modules too, and unify phylink's detection of PHYs with broken in-band
autoneg with the newly introduced PHY driver methods.
https://patchwork.kernel.org/project/netdevbpf/cover/20210212172341.3489046-1-olteanv@gmail.com/

This change set is only superficially tested, hence the RFC tag. It does
what I need on the NXP boards with on-board PHYs that I have, and also
seems to behave the same as before when I use a 1G SGMII SFP module with
the Marvell 88E1111 PHY (the only thing I have). I do not have the
ability to test the Methode DM7052 SFP module for the bcm84881.c driver
change, since I don't have that.

Posting the patch series mostly to figure out whether I understood the
change request correctly.

Vladimir Oltean (5):
  net: phylink: pass the phy argument to phylink_sfp_config
  net: phylink: introduce a generic method for querying PHY in-band
    autoneg capability
  net: phy: bcm84881: move the in-band capability check where it belongs
  net: phylink: explicitly configure in-band autoneg for PHYs that
    support it
  net: phy: mscc: configure in-band auto-negotiation for VSC8514

 drivers/net/phy/bcm84881.c       | 10 ++++
 drivers/net/phy/mscc/mscc.h      |  2 +
 drivers/net/phy/mscc/mscc_main.c | 20 +++++++
 drivers/net/phy/phy.c            | 25 +++++++++
 drivers/net/phy/phylink.c        | 93 +++++++++++++++++++++++++-------
 include/linux/phy.h              | 24 +++++++++
 6 files changed, 154 insertions(+), 20 deletions(-)

-- 
2.25.1