rtc: Add useful timestamp definitions

Add commonly used timestamps for range definition.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

diff --git a/include/linux/rtc.h b/include/linux/rtc.h
index 82a3038..4c007f6 100644 (file)
--- a/include/linux/rtc.h
+++ b/include/linux/rtc.h
@@ -169,6 +169,11 @@ struct rtc_device {
 };
 #define to_rtc_device(d) container_of(d, struct rtc_device, dev)
 
+/* useful timestamps */
+#define RTC_TIMESTAMP_BEGIN_1900       -2208989361LL /* 1900-01-01 00:00:00 */
+#define RTC_TIMESTAMP_BEGIN_2000       946684800LL /* 2000-01-01 00:00:00 */
+#define RTC_TIMESTAMP_END_2099         4102444799LL /* 2099-12-31 23:59:59 */
+
 extern struct rtc_device *rtc_device_register(const char *name,
                                        struct device *dev,
                                        const struct rtc_class_ops *ops,