Add PTP hardware clock support to the zl3073x DPLL driver.

Patch 1 adds low-level channel operations for ToD read/write/adjust,
output phase step, delta frequency offset write and TIE write as
building blocks for PTP callbacks.

Patch 2 registers a PTP clock device for each DPLL channel with
gettimex64, settime64, adjtime, adjfine, adjphase, getmaxphase
and perout callbacks. Callback availability adapts to the current
channel state - adjfine requires NCO pin connected, adjphase uses
TIE write when tracking a reference, and adjtime selects the
appropriate mechanism automatically.

Link: https://lore.kernel.org/netdev/20260708170527.916035-1-ivecera@redhat.com/ (local)

Changes:
v2:
  - Squash low-level ops patches (1+3) into patch 1.
  - Squash PTP callback patches (2+4) into patch 2, register PTP
    clock regardless of initial channel state.

Ivan Vecera (2):
  dpll: zl3073x: add channel ToD, phase step and TIE operations
  dpll: zl3073x: add PTP clock support

 drivers/dpll/zl3073x/Kconfig |   6 +-
 drivers/dpll/zl3073x/chan.c  | 307 +++++++++++++++++++
 drivers/dpll/zl3073x/chan.h  |  48 +++
 drivers/dpll/zl3073x/core.c  |   8 +
 drivers/dpll/zl3073x/core.h  |   8 +
 drivers/dpll/zl3073x/dpll.c  | 575 +++++++++++++++++++++++++++++++++--
 drivers/dpll/zl3073x/dpll.h  |   6 +
 drivers/dpll/zl3073x/regs.h  |  56 ++++
 8 files changed, 978 insertions(+), 36 deletions(-)


base-commit: 4a13f31a92f35161b499bf29638336885259da78
-- 
2.53.0