ZL3073X_DPLL_REF_NONE
#define ZL3073X_DPLL_REF_IS_VALID(_ref) ((_ref) != ZL3073X_DPLL_REF_NONE)
*ref = ZL3073X_DPLL_REF_NONE;
*ref = ZL3073X_DPLL_REF_NONE;
if (ref == ZL3073X_DPLL_REF_NONE) {
if (ref == ZL3073X_DPLL_REF_NONE)
*ref = ZL3073X_DPLL_REF_NONE;
new_ref = ZL3073X_DPLL_REF_NONE;