Merge branch 'dpll-zl3073x-refactor-state-management'

Ivan Vecera says:

====================
dpll: zl3073x: Refactor state management

This patch set is a refactoring of the zl3073x driver to clean up
state management, improve modularity, and significantly reduce
on-demand I/O.

The driver's dpll.c implementation previously performed on-demand
register reads and writes (wrapped in mailbox operations) to get
or set properties like frequency, phase, and embedded-sync settings.
This cluttered the DPLL logic with low-level I/O, duplicated locking,
and led to inefficient bus traffic.

This series addresses this by:
1. Splitting the monolithic 'core.c' into logical units ('ref.c',
   'out.c', 'synth.c').
2. Implementing a full read/write-back cache for 'zl3073x_ref' and
   'zl3073x_out' structures.

All state is now read once during '_state_fetch()' (and status updated
periodically). DPLL get callbacks read from this cache. Set callbacks
modify a copy of the state, which is then committed via a new
'..._state_set()' function. These '_state_set' functions compare
the new state to the cached state and write *only* the modified
register values back to the hardware, all within a single mailbox
sequence.

The result is a much cleaner 'dpll.c' that is almost entirely
free of direct register I/O, and all state logic is properly
encapsulated in its respective file.

The series is broken down as follows:

* Patch 1: Changes the state structs to store raw register values
  (e.g., 'config', 'ctrl') instead of parsed booleans, centralizing
  parsing logic into the helpers.
* Patch 2: Splits the logic from 'core.c' into new 'ref.c', 'out.c'
  and 'synth.c' files, creating a 'zl3073x_dev_...' abstraction layer.
* Patch 3: Introduces the caching concept by reading and caching
  the reference monitor status periodically, removing scattered
  reads from 'dpll.c'.
* Patch 4: Expands the 'zl3073x_ref' struct to cache *all* reference
  properties and adds 'zl3073x_ref_state_set()' to write back changes.
* Patch 5: Does the same for the 'zl3073x_out' struct, caching all
  output properties and adding 'zl3073x_out_state_set()'.
* Patch 6: A final cleanup that removes the 'zl3073x_dev_...' wrapper
  functions that became redundant after the refactoring.
====================

Link: https://patch.msgid.link/20251113074105.141379-1-ivecera@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>