[PATCH net-next v5 0/3] dpll: add SiTime SiT9531x DPLL clock driver

[Ali Rouhi <arouhi@sitime.com>]

This series adds a DPLL subsystem driver for the SiTime SiT95316 and
SiT95317 I2C clock generators. Each device integrates four PLLs with
automatic/manual reference selection and on-chip TDC phase-offset
measurement, and is used for synchronization in telecom, networking,
and data-center timing.

The series contains the device-tree binding, the driver under
drivers/dpll/sit9531x/, and the MAINTAINERS entry.

v1: https://lore.kernel.org/netdev/20260511211143.19792-1-arouhi@sitime.com/
v2: https://lore.kernel.org/netdev/20260520191943.73938-1-arouhi@sitime.com/
v3: https://lore.kernel.org/netdev/20260731180951.65725-1-arouhi@sitime.com/
v4: https://lore.kernel.org/netdev/20260806232439.27551-1-arouhi@sitime.com/

Changes since v4 (address Krzysztof Kozlowski's review):

  Binding:
  - Rename sitime,sit9531x.yaml to sitime,sit95316.yaml, naming the file
    after the first compatible rather than a wildcard the parts do not
    carry, and drop "SiT9531x" from the title for the same reason.
  - Correct the input count: both parts expose eight selectable
    references (four differential pairs whose lanes can also be driven
    separately as single-ended inputs).
  - Drop the clock-frequency fallback and the schema branch that allowed
    it; the oscillator is always described through the clock framework, so
    clocks/clock-names are now required.
  - Explain why sitime,pll-fvco carries no unit suffix (the values exceed
    the 32 bits "-hz" allows and are not whole megahertz), and add it,
    together with sitime,output-pll-map, to the example.
  - Keep a single example.

  Driver:
  - Drop the debugfs interface and the orphaned DCO steering backend that
    only fed it.
  - Rework the DPLL init/teardown so the error path unwinds explicitly
    instead of probing internal state, registering the managed cleanup
    action only after every field it touches is initialized.
  - Drop the clock-frequency fallback for the XO rate; the clock is
    required, so devm_clk_get_enabled() replaces the _optional_ variant.
  - Drop the i2c_device_id table; the OF table alone suffices.
  - Take dev_err_probe()'s return value directly.
  - Say nothing on success; an unknown dpll-types string becomes a
    warning rather than an info log.
  - Move DPLL registration next to probe, drop the kernel-doc formalism
    from internal helpers, and cut the narration out of the comments.
  - Name the page-0 status registers after what they hold (register 0x06
    is outer loss-of-lock, not holdover) and remove the register defines
    left with nothing to define after the DCO/SYSREF removals.
  - Rebased onto current net-next; base-commit recorded below.


Ali Rouhi (3):
  dt-bindings: vendor-prefixes: add SiTime Corporation
  dt-bindings: dpll: add SiTime SiT95316 clock generator
  dpll: add SiTime SiT9531x DPLL clock driver

 .../bindings/dpll/sitime,sit95316.yaml        |  171 +
 .../devicetree/bindings/vendor-prefixes.yaml  |    2 +
 MAINTAINERS                                   |    7 +
 drivers/dpll/Kconfig                          |    1 +
 drivers/dpll/Makefile                         |    1 +
 drivers/dpll/sit9531x/Kconfig                 |   17 +
 drivers/dpll/sit9531x/Makefile                |    4 +
 drivers/dpll/sit9531x/core.c                  | 2939 +++++++++++++++++
 drivers/dpll/sit9531x/core.h                  |  367 ++
 drivers/dpll/sit9531x/dpll.c                  | 1151 +++++++
 drivers/dpll/sit9531x/dpll.h                  |   69 +
 drivers/dpll/sit9531x/prop.c                  |  397 +++
 drivers/dpll/sit9531x/prop.h                  |   39 +
 drivers/dpll/sit9531x/regs.h                  |  318 ++
 14 files changed, 5483 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dpll/sitime,sit95316.yaml
 create mode 100644 drivers/dpll/sit9531x/Kconfig
 create mode 100644 drivers/dpll/sit9531x/Makefile
 create mode 100644 drivers/dpll/sit9531x/core.c
 create mode 100644 drivers/dpll/sit9531x/core.h
 create mode 100644 drivers/dpll/sit9531x/dpll.c
 create mode 100644 drivers/dpll/sit9531x/dpll.h
 create mode 100644 drivers/dpll/sit9531x/prop.c
 create mode 100644 drivers/dpll/sit9531x/prop.h
 create mode 100644 drivers/dpll/sit9531x/regs.h


base-commit: 001b5d347d8ba39b2dccaefcc57967b18caec8fe
-- 
2.43.0