Add a new DPLL_PIN_TYPE_INT_NCO pin type for virtual pins representing
the NCO mode of a DPLL and implement support for it in the zl3073x driver.

Patch 1 adds the new pin type to the DPLL netlink spec and UAPI header.

Patch 2 replaces the single 2s poll timeout with per-operation timeouts
based on Microchip proprietary source code and own measurement.

Patch 3 adds a per-DPLL serialization mutex taken by all DPLL callbacks
and the periodic worker, establishing a single lock that protects all
per-channel state. The chan_state_update() call is moved under this lock.

Patch 4 adds a virtual NCO input pin to the zl3073x driver that allows
userspace to switch a DPLL channel into NCO mode. The pin reports
connected/active state when the channel is in NCO mode and handles
the hardware-specific details of mode transitions including automatic
df_offset capture and 1PPS phase preservation.

Changes:
v5:
  - Rebased on net-next after the freq_monitor per-device fix
    landed via net.
  - Move phase_offset_avg_factor_set notification loop outside lock
    to avoid lockdep false positive on multi-channel devices (patch 3).
  - Configure dpll_df_read register before NCO mode switch (patch 4).
  - Add 5ms delay before reading nco_auto_read captured df_offset,
    determined by HW testing (patch 4).
  - Mark df_offset as unknown at probe when firmware left channel
    in NCO mode (patch 4).
  - See individual patches for detailed changelogs.
v4:
  - New patch 2: per-operation poll timeouts
  - New patch 3: per-DPLL serialization lock
  - See individual patches for detailed changelogs.
v3:
  - fixed SoB position
v2:
  - See individual patches for detailed changelogs.

Ivan Vecera (4):
  dpll: add DPLL_PIN_TYPE_INT_NCO pin type
  dpll: zl3073x: use per-operation poll timeouts
  dpll: zl3073x: add per-DPLL serialization lock
  dpll: zl3073x: add NCO virtual input pin

 Documentation/netlink/specs/dpll.yaml |  13 +
 drivers/dpll/dpll_nl.c                |   2 +-
 drivers/dpll/zl3073x/chan.c           | 124 ++++++-
 drivers/dpll/zl3073x/chan.h           |  48 +++
 drivers/dpll/zl3073x/core.c           |  44 +--
 drivers/dpll/zl3073x/core.h           |  10 +-
 drivers/dpll/zl3073x/dpll.c           | 488 ++++++++++++++++++++++----
 drivers/dpll/zl3073x/dpll.h           |   4 +
 drivers/dpll/zl3073x/regs.h           |  11 +
 include/uapi/linux/dpll.h             |   4 +
 10 files changed, 651 insertions(+), 97 deletions(-)


base-commit: 8415598365503ced2e3d019491b0a2756c85c494
-- 
2.53.0