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diff --git a/include/asm-arm/arch-at91/at91_rtt.h b/include/asm-arm/arch-at91/at91_rtt.h
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+++ b/include/asm-arm/arch-at91/at91_rtt.h
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+/*
+ * include/asm-arm/arch-at91/at91_rtt.h
+ *
+ * Real-time Timer (RTT) - System peripherals regsters.
+ * Based on AT91SAM9261 datasheet revision D.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef AT91_RTT_H
+#define AT91_RTT_H
+
+#define AT91_RTT_MR (AT91_RTT + 0x00) /* Real-time Mode Register */
+#define AT91_RTT_RTPRES (0xffff << 0) /* Real-time Timer Prescaler Value */
+#define AT91_RTT_ALMIEN (1 << 16) /* Alarm Interrupt Enable */
+#define AT91_RTT_RTTINCIEN (1 << 17) /* Real Time Timer Increment Interrupt Enable */
+#define AT91_RTT_RTTRST (1 << 18) /* Real Time Timer Restart */
+
+#define AT91_RTT_AR (AT91_RTT + 0x04) /* Real-time Alarm Register */
+#define AT91_RTT_ALMV (0xffffffff) /* Alarm Value */
+
+#define AT91_RTT_VR (AT91_RTT + 0x08) /* Real-time Value Register */
+#define AT91_RTT_CRTV (0xffffffff) /* Current Real-time Value */
+
+#define AT91_RTT_SR (AT91_RTT + 0x0c) /* Real-time Status Register */
+#define AT91_RTT_ALMS (1 << 0) /* Real-time Alarm Status */
+#define AT91_RTT_RTTINC (1 << 1) /* Real-time Timer Increment */
+
+#endif