Merge branch 'dpll-core-improvements-and-ice-e825-c-synce-support'

Merge branch 'dpll-core-improvements-and-ice-e825-c-synce-support'

Ivan Vecera says:

====================
dpll: Core improvements and ice E825-C SyncE support

This series introduces Synchronous Ethernet (SyncE) support for the Intel
E825-C Ethernet controller. Unlike previous generations where DPLL
connections were implicitly assumed, the E825-C architecture relies
on the platform firmware (ACPI) to describe the physical connections
between the Ethernet controller and external DPLLs (such as the ZL3073x).

To accommodate this, the series extends the DPLL subsystem to support
firmware node (fwnode) associations, asynchronous discovery via notifiers,
and dynamic pin management. Additionally, a significant refactor of
the DPLL reference counting logic is included to ensure robustness and
debuggability.

DPLL Core Extensions:
* Firmware Node Association: Pins can now be associated with a struct
  fwnode_handle after allocation via dpll_pin_fwnode_set(). This allows
  drivers to link pin objects with their corresponding DT/ACPI nodes.
* Asynchronous Notifiers: A raw notifier chain is added to the DPLL core.
  This allows the Ethernet driver to subscribe to events and react when
  the platform DPLL driver registers the parent pins, resolving probe
  ordering dependencies.
* Dynamic Indexing: Drivers can now request DPLL_PIN_IDX_UNSPEC to have
  the core automatically allocate a unique pin index.

Reference Counting & Debugging:
* Refactor: The reference counting logic in the core is consolidated.
  Internal list management helpers now automatically handle hold/put
  operations, removing fragile open-coded logic in the registration paths.
* Reference Tracking: A new Kconfig option DPLL_REFCNT_TRACKER is added.
  This allows developers to instrument and debug reference leaks by
  recording stack traces for every get/put operation.

Driver Updates:
* zl3073x: Updated to associate pins with fwnode handles using the new
  setter and support the 'mux' pin type.
* ice: Implements the E825-C specific hardware configuration for SyncE
  (CGU registers). It utilizes the new notifier and fwnode APIs to
  dynamically discover and attach to the platform DPLLs.

Patch Summary:
Patch 1: DPLL Core (fwnode association).
Patch 2: Driver zl3073x (Set fwnode).
Patch 3-4: DPLL Core (Notifiers and dynamic IDs).
Patch 5: Driver zl3073x (Mux type).
Patch 6: DPLL Core (Refcount refactor).
Patch 7-8: Refcount tracking infrastructure and driver updates.
Patch 9: Driver ice (E825-C SyncE logic).
====================

Link: https://patch.msgid.link/20260203174002.705176-1-ivecera@redhat.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>