The firmware of MxL862xx managed Ethernet switches can be updated
in-system via the same MDIO bus which is also used to manage the
switch. Wire up the devlink flash_update operation for DSA drivers
and implement firmware update and version reporting in the mxl862xx
driver.

Changes since RFC [1]:
 - detect a switch stuck in MCUboot rescue mode at probe, register
   the switch without any ports and report "mcuboot-rescue" as the
   running firmware version, so devlink flash can recover from a
   failed or interrupted update (Andrew Lunn)
 - clarify in the commit message of patch 2 that the per-transaction
   MDIO bus locking is about other, non-switch devices on the same
   MDIO bus (Andrew Lunn)
 - mention in the commit message of patch 3 that closing the ports
   also stops phylib from polling the switch-internal PHYs during
   the transfer (Andrew Lunn)
 - split up run-on sentence and explain the dynamically allocated
   reprobe work item instead of just pointing at iwlwifi in the
   commit message of patch 3 (Manuel Ebner)
 - use kzalloc_obj() (Manuel Ebner)
 - state the actual duration of a complete flash and reprobe cycle
   (just under a minute) in comments and the commit message, and
   clarify that the timeout values are generous upper bounds
   (Manuel Ebner)

[1] https://lore.kernel.org/all/ak0J-HgzMRea53om@makrotopia.org/ (local)

Daniel Golle (4):
  net: dsa: wire flash_update devlink callback to drivers
  net: dsa: mxl862xx: add SMDIO clause-22 register access
  net: dsa: mxl862xx: add devlink flash_update and info_get
  net: dsa: mxl862xx: recover switch stuck in MCUboot rescue mode

 drivers/net/dsa/mxl862xx/Makefile           |   2 +-
 drivers/net/dsa/mxl862xx/mxl862xx-cmd.h     |   1 +
 drivers/net/dsa/mxl862xx/mxl862xx-fw.c      | 439 ++++++++++++++++++++
 drivers/net/dsa/mxl862xx/mxl862xx-fw.h      |  18 +
 drivers/net/dsa/mxl862xx/mxl862xx-host.c    |  45 ++
 drivers/net/dsa/mxl862xx/mxl862xx-host.h    |   2 +
 drivers/net/dsa/mxl862xx/mxl862xx-phylink.c |   2 +
 drivers/net/dsa/mxl862xx/mxl862xx.c         |  41 +-
 drivers/net/dsa/mxl862xx/mxl862xx.h         |   9 +
 include/net/dsa.h                           |   3 +
 net/dsa/devlink.c                           |  13 +
 11 files changed, 571 insertions(+), 4 deletions(-)
 create mode 100644 drivers/net/dsa/mxl862xx/mxl862xx-fw.c
 create mode 100644 drivers/net/dsa/mxl862xx/mxl862xx-fw.h


base-commit: f6f3b36c15ed44de1fbb44e645e4fae8c4a4453e
-- 
2.55.0