[PATCH net-next 0/6] dpll: zl3073x: add PTP periodic output support

[Ivan Vecera <ivecera@redhat.com>]

This series extends the zl3073x output pin support and finally adds PTP
periodic output (perout) support on top of it.

Each zl3073x output exposes a P-pin and an N-pin that share a single HW
output and most of its configuration registers. Patch 1 makes a change
requested on one pin notify the sibling pin as well, so userspace on the
sibling is told when its effective frequency, esync or phase adjustment
changed.

Patches 2 and 3 add the plumbing to control an individual output pin:
GPO override registers and a clean stop/restart of an output (patch 2),
and then per-pin enable/disable through the state_on_dpll_get/set
callbacks - differential pins via the output stop condition, CMOS pins
via the GPO override bracketed by a glitch-free stop/restart (patch 3).

Patches 4 and 5 are preparatory: the per-pin 'esync_control' boolean is
replaced by an extensible 'caps' bitmap, and the divisor/N-division
computation is factored out of frequency_set() into a helper that
updates a struct zl3073x_out without committing it.

Patch 6 registers a PTP periodic output pin for each output pin that
supports step-time and declares 1 PPS support in firmware. Any perout
channel can be assigned to any such pin; only 1 PPS is supported.
Enabling a channel programs its pin for 1 Hz and connects it, disabling
disconnects it, reusing the helper and connect/disconnect primitive
introduced earlier in the series.

Ivan Vecera (6):
  dpll: zl3073x: notify sibling pin when shared output config changes
  dpll: zl3073x: add GPO support for output pins
  dpll: zl3073x: allow enabling/disabling output pins
  dpll: zl3073x: consolidate pin capabilities into bitmap
  dpll: zl3073x: factor out output pin frequency helper
  dpll: zl3073x: add PTP periodic output support

 drivers/dpll/zl3073x/core.c | 117 ++++++++
 drivers/dpll/zl3073x/core.h |  30 ++
 drivers/dpll/zl3073x/dpll.c | 539 +++++++++++++++++++++++++++++++-----
 drivers/dpll/zl3073x/dpll.h |   4 +
 drivers/dpll/zl3073x/out.c  |  50 +++-
 drivers/dpll/zl3073x/out.h  | 138 ++++++++-
 drivers/dpll/zl3073x/prop.c |   2 +
 drivers/dpll/zl3073x/prop.h |  21 ++
 drivers/dpll/zl3073x/regs.h |  20 ++
 9 files changed, 834 insertions(+), 87 deletions(-)


base-commit: 014d795c73837ea2339a4ea8e8f82c6e959b845d
-- 
2.55.0