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Extract common measurement latch logic from zl3073x_ref_ffo_update() into a new zl3073x_ref_freq_meas_latch() helper and add zl3073x_ref_freq_meas_update() that uses it to latch and read absolute input reference frequencies in Hz. Add meas_freq field to struct zl3073x_ref and the corresponding zl3073x_ref_meas_freq_get() accessor. The measured frequencies are updated periodically alongside the existing FFO measurements. Add freq_monitor boolean to struct zl3073x_dpll and implement the freq_monitor_set/get device callbacks to enable/disable frequency monitoring via the DPLL netlink interface. Implement measured_freq_get pin callback for input pins that returns the measured input frequency in mHz. Reviewed-by: Petr Oros <poros@redhat.com> Signed-off-by: Ivan Vecera <ivecera@redhat.com> Link: https://patch.msgid.link/20260402184057.1890514-4-ivecera@redhat.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>