[PATCH net-next v4 0/4] dpll: add NCO pin type and zl3073x support

[Ivan Vecera <ivecera@redhat.com>]

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:
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           | 102 +++++-
 drivers/dpll/zl3073x/chan.h           |  48 +++
 drivers/dpll/zl3073x/core.c           |  47 ++-
 drivers/dpll/zl3073x/core.h           |  10 +-
 drivers/dpll/zl3073x/dpll.c           | 495 ++++++++++++++++++++++----
 drivers/dpll/zl3073x/dpll.h           |   4 +
 drivers/dpll/zl3073x/regs.h           |   9 +
 include/uapi/linux/dpll.h             |   4 +
 10 files changed, 628 insertions(+), 106 deletions(-)


base-commit: aa064a614efcfa4c300609d1f01134e99a12ad10
-- 
2.53.0