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 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:
v3:
  - fixed SoB position
v2:
  - See individual patches for detailed changelogs.

Ivan Vecera (2):
  dpll: add DPLL_PIN_TYPE_INT_NCO pin type
  dpll: zl3073x: add NCO virtual input pin

 Documentation/netlink/specs/dpll.yaml |  13 ++
 drivers/dpll/dpll_nl.c                |   2 +-
 drivers/dpll/zl3073x/chan.c           |  68 ++++++-
 drivers/dpll/zl3073x/chan.h           |  25 +++
 drivers/dpll/zl3073x/dpll.c           | 277 ++++++++++++++++++++++----
 drivers/dpll/zl3073x/dpll.h           |   2 +
 drivers/dpll/zl3073x/regs.h           |   7 +
 include/uapi/linux/dpll.h             |   4 +
 8 files changed, 357 insertions(+), 41 deletions(-)

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2.53.0