598 	 * 1/16 full scale of signal level for impedance measurement.  in nau8825_xtalk_prepare()
626 	/* Enable the TESTDAC and  disable L/R HP impedance */  in nau8825_xtalk_clean_dac()
690 		/* Enable right headphone impedance */  in nau8825_xtalk_imm_start()
696 		/* Enable left headphone impedance */  in nau8825_xtalk_imm_start()
705 	/* Impedance measurement mode enable */  in nau8825_xtalk_imm_start()
712 	/* Impedance measurement mode disable */  in nau8825_xtalk_imm_stop()
728  *     IMM stat to make JKR1(HPR) impedance measure.
730  *     to HPL IMM state to make JKTIP(HPL) impedance measure.
748 		/* Trigger right headphone impedance detection */  in nau8825_xtalk_measure()
754 		 * impedance measure result, and then start up left side.  in nau8825_xtalk_measure()
762 		/* Trigger left headphone impedance detection */  in nau8825_xtalk_measure()
768 		 * impedance measure result, and delay some time to wait  in nau8825_xtalk_measure()
782 		/* In impedance measure state, the orignal and cross talk  in nau8825_xtalk_measure()
808 	 * the impedance measure state.  in nau8825_xtalk_work()
1603 	/* The JKSLV and JKR2 all detected in high impedance headset */  in nau8825_jack_insert()
1711 				 * headset without high impedance.  in nau8825_interrupt()
1734 				 * in the headset with high impedance. Thus,  in nau8825_interrupt()
2455 	dev_dbg(dev, "vref-impedance:       %d\n", nau8825->vref_impedance);  in nau8825_print_device_properties()
2493 	ret = device_property_read_u32(dev, "nuvoton,vref-impedance",  in nau8825_read_device_properties()