diff --git a/drivers/mfd/wm5110-tables.c b/drivers/mfd/wm5110-tables.c
index 12cad94b4035..62a4aa13cb98 100644
--- a/drivers/mfd/wm5110-tables.c
+++ b/drivers/mfd/wm5110-tables.c
@@ -676,6 +676,7 @@ static const struct reg_default wm5110_reg_default[] = {
 	{ 0x00000032, 0x0100 },    /* R50    - PWM Drive 3 */
 	{ 0x00000040, 0x0000 },    /* R64    - Wake control */
 	{ 0x00000041, 0x0000 },    /* R65    - Sequence control */
+	{ 0x00000042, 0x0000 },    /* R66    - Spare Triggers */
 	{ 0x00000061, 0x01FF },    /* R97    - Sample Rate Sequence Select 1 */
 	{ 0x00000062, 0x01FF },    /* R98    - Sample Rate Sequence Select 2 */
 	{ 0x00000063, 0x01FF },    /* R99    - Sample Rate Sequence Select 3 */
@@ -1716,6 +1717,7 @@ static bool wm5110_readable_register(struct device *dev, unsigned int reg)
 	case ARIZONA_PWM_DRIVE_3:
 	case ARIZONA_WAKE_CONTROL:
 	case ARIZONA_SEQUENCE_CONTROL:
+	case ARIZONA_SPARE_TRIGGERS:
 	case ARIZONA_SAMPLE_RATE_SEQUENCE_SELECT_1:
 	case ARIZONA_SAMPLE_RATE_SEQUENCE_SELECT_2:
 	case ARIZONA_SAMPLE_RATE_SEQUENCE_SELECT_3:
diff --git a/include/linux/mfd/arizona/registers.h b/include/linux/mfd/arizona/registers.h
index 3499d36e6067..11affb3c2768 100644
--- a/include/linux/mfd/arizona/registers.h
+++ b/include/linux/mfd/arizona/registers.h
@@ -39,6 +39,7 @@
 #define ARIZONA_PWM_DRIVE_3                      0x32
 #define ARIZONA_WAKE_CONTROL                     0x40
 #define ARIZONA_SEQUENCE_CONTROL                 0x41
+#define ARIZONA_SPARE_TRIGGERS                   0x42
 #define ARIZONA_SAMPLE_RATE_SEQUENCE_SELECT_1    0x61
 #define ARIZONA_SAMPLE_RATE_SEQUENCE_SELECT_2    0x62
 #define ARIZONA_SAMPLE_RATE_SEQUENCE_SELECT_3    0x63
@@ -1430,6 +1431,42 @@
 #define ARIZONA_WSEQ_ENA_JD2_RISE_SHIFT               0  /* WSEQ_ENA_JD2_RISE */
 #define ARIZONA_WSEQ_ENA_JD2_RISE_WIDTH               1  /* WSEQ_ENA_JD2_RISE */
 
+/*
+ * R66 (0x42) - Spare Triggers
+ */
+#define ARIZONA_WS_TRG8                          0x0080  /* WS_TRG8 */
+#define ARIZONA_WS_TRG8_MASK                     0x0080  /* WS_TRG8 */
+#define ARIZONA_WS_TRG8_SHIFT                         7  /* WS_TRG8 */
+#define ARIZONA_WS_TRG8_WIDTH                         1  /* WS_TRG8 */
+#define ARIZONA_WS_TRG7                          0x0040  /* WS_TRG7 */
+#define ARIZONA_WS_TRG7_MASK                     0x0040  /* WS_TRG7 */
+#define ARIZONA_WS_TRG7_SHIFT                         6  /* WS_TRG7 */
+#define ARIZONA_WS_TRG7_WIDTH                         1  /* WS_TRG7 */
+#define ARIZONA_WS_TRG6                          0x0020  /* WS_TRG6 */
+#define ARIZONA_WS_TRG6_MASK                     0x0020  /* WS_TRG6 */
+#define ARIZONA_WS_TRG6_SHIFT                         5  /* WS_TRG6 */
+#define ARIZONA_WS_TRG6_WIDTH                         1  /* WS_TRG6 */
+#define ARIZONA_WS_TRG5                          0x0010  /* WS_TRG5 */
+#define ARIZONA_WS_TRG5_MASK                     0x0010  /* WS_TRG5 */
+#define ARIZONA_WS_TRG5_SHIFT                         4  /* WS_TRG5 */
+#define ARIZONA_WS_TRG5_WIDTH                         1  /* WS_TRG5 */
+#define ARIZONA_WS_TRG4                          0x0008  /* WS_TRG4 */
+#define ARIZONA_WS_TRG4_MASK                     0x0008  /* WS_TRG4 */
+#define ARIZONA_WS_TRG4_SHIFT                         3  /* WS_TRG4 */
+#define ARIZONA_WS_TRG4_WIDTH                         1  /* WS_TRG4 */
+#define ARIZONA_WS_TRG3                          0x0004  /* WS_TRG3 */
+#define ARIZONA_WS_TRG3_MASK                     0x0004  /* WS_TRG3 */
+#define ARIZONA_WS_TRG3_SHIFT                         2  /* WS_TRG3 */
+#define ARIZONA_WS_TRG3_WIDTH                         1  /* WS_TRG3 */
+#define ARIZONA_WS_TRG2                          0x0002  /* WS_TRG2 */
+#define ARIZONA_WS_TRG2_MASK                     0x0002  /* WS_TRG2 */
+#define ARIZONA_WS_TRG2_SHIFT                         1  /* WS_TRG2 */
+#define ARIZONA_WS_TRG2_WIDTH                         1  /* WS_TRG2 */
+#define ARIZONA_WS_TRG1                          0x0001  /* WS_TRG1 */
+#define ARIZONA_WS_TRG1_MASK                     0x0001  /* WS_TRG1 */
+#define ARIZONA_WS_TRG1_SHIFT                         0  /* WS_TRG1 */
+#define ARIZONA_WS_TRG1_WIDTH                         1  /* WS_TRG1 */
+
 /*
  * R97 (0x61) - Sample Rate Sequence Select 1
  */