--- a/include/linux/rtc.h~drivers-rtc-rtc-mxcc-remove-defines-already-included-in-rtch-fix
+++ a/include/linux/rtc.h
@@ -92,10 +92,10 @@ struct rtc_pll_info {
 #define RTC_PLL_SET	_IOW('p', 0x12, struct rtc_pll_info)  /* Set PLL correction */
 
 /* interrupt flags */
-#define RTC_IRQF 0x80 /* any of the following is active */
-#define RTC_PF 0x40
-#define RTC_AF 0x20
-#define RTC_UF 0x10
+#define RTC_IRQF 0x80	/* Any of the following is active */
+#define RTC_PF 0x40	/* Periodic interrupt */
+#define RTC_AF 0x20	/* Alarm interrupt */
+#define RTC_UF 0x10	/* Update interrupt for 1Hz RTC */
 
 #ifdef __KERNEL__