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

Ivan Vecera says:

====================
dpll: zl3073x: refactor state management

This series refactors the zl3073x DPLL driver to centralize hardware
state management behind dedicated per-module state interfaces, replacing
scattered direct register accesses in dpll.c with cached state and
proper accessor functions.

The driver already uses a fetch/get/set pattern for ref, out, and synth
modules. This series extends and refines that pattern:

First, struct_group() is applied to the existing ref, out, and synth
structures to partition fields into cfg (mutable configuration), inv
(invariants set at init), and stat (read-only status) groups. This
enables group-level memcmp for short-circuit checks and bulk copies in
state_set, and adds invariant validation guards.

A ref_state_update() helper is extracted to encapsulate the per-reference
monitor status register read, keeping direct register access behind the
ref module interface.

A new zl3073x_chan module is introduced following the same pattern,
caching the DPLL channel mode_refsel register with inline getters and
setters. The refsel_mode and forced_ref fields are removed from struct
zl3073x_dpll in favor of the cached channel state.

The chan module is then extended with cached mon_status and refsel_status
registers, converting lock_status_get and selected_ref_get from direct
HW reads to cached state lookups refreshed by the periodic worker.

Reference priority registers are cached in the chan cfg group, removing
the ad-hoc ref_prio_get/set functions and the redundant pin->selectable
flag, which is now derived from the cached priority. The
selected_ref_set function is inlined into input_pin_state_on_dpll_set,
unifying all mode paths through a single chan_state_set commit point.

Finally, selected_ref_get is dropped entirely since the refsel_status
register provides the selected reference regardless of mode, and
connected_ref_get is simplified to a direct refsel_state check.
====================

Link: https://patch.msgid.link/20260315174224.399074-1-ivecera@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>