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Add support for .supported_modes_get() and .mode_set() callbacks to enable switching between manual and automatic modes via netlink. Implement .supported_modes_get() to report available modes based on the current hardware configuration: * manual mode is always supported * automatic mode is supported unless the dpll channel is configured in NCO (Numerically Controlled Oscillator) mode Implement .mode_set() to handle the specific logic required when transitioning between modes: 1) Transition to manual: * If a valid reference is currently active, switch the hardware to ref-lock mode (force lock to that reference). * If no reference is valid and the DPLL is unlocked, switch to freerun. * Otherwise, switch to Holdover. 2) Transition to automatic: * If the currently selected reference pin was previously marked as non-selectable (likely during a previous manual forcing operation), restore its priority and selectability in the hardware. * Switch the hardware to Automatic selection mode. Signed-off-by: Ivan Vecera <ivecera@redhat.com> Reviewed-by: Prathosh Satish <Prathosh.Satish@microchip.com> Link: https://patch.msgid.link/20260114122726.120303-4-ivecera@redhat.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>