v4.19.13 snapshot.
diff --git a/include/linux/rtc/m48t59.h b/include/linux/rtc/m48t59.h
new file mode 100644
index 0000000..6fc9614
--- /dev/null
+++ b/include/linux/rtc/m48t59.h
@@ -0,0 +1,64 @@
+/*
+ * include/linux/rtc/m48t59.h
+ *
+ * Definitions for the platform data of m48t59 RTC chip driver.
+ *
+ * Copyright (c) 2007 Wind River Systems, Inc.
+ *
+ * Mark Zhan <rongkai.zhan@windriver.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _LINUX_RTC_M48T59_H_
+#define _LINUX_RTC_M48T59_H_
+
+/*
+ * M48T59 Register Offset
+ */
+#define M48T59_YEAR 0xf
+#define M48T59_MONTH 0xe
+#define M48T59_MDAY 0xd /* Day of Month */
+#define M48T59_WDAY 0xc /* Day of Week */
+#define M48T59_WDAY_CB 0x20 /* Century Bit */
+#define M48T59_WDAY_CEB 0x10 /* Century Enable Bit */
+#define M48T59_HOUR 0xb
+#define M48T59_MIN 0xa
+#define M48T59_SEC 0x9
+#define M48T59_CNTL 0x8
+#define M48T59_CNTL_READ 0x40
+#define M48T59_CNTL_WRITE 0x80
+#define M48T59_WATCHDOG 0x7
+#define M48T59_INTR 0x6
+#define M48T59_INTR_AFE 0x80 /* Alarm Interrupt Enable */
+#define M48T59_INTR_ABE 0x20
+#define M48T59_ALARM_DATE 0x5
+#define M48T59_ALARM_HOUR 0x4
+#define M48T59_ALARM_MIN 0x3
+#define M48T59_ALARM_SEC 0x2
+#define M48T59_UNUSED 0x1
+#define M48T59_FLAGS 0x0
+#define M48T59_FLAGS_WDT 0x80 /* watchdog timer expired */
+#define M48T59_FLAGS_AF 0x40 /* alarm */
+#define M48T59_FLAGS_BF 0x10 /* low battery */
+
+#define M48T59RTC_TYPE_M48T59 0 /* to keep compatibility */
+#define M48T59RTC_TYPE_M48T02 1
+#define M48T59RTC_TYPE_M48T08 2
+
+struct m48t59_plat_data {
+ /* The method to access M48T59 registers */
+ void (*write_byte)(struct device *dev, u32 ofs, u8 val);
+ unsigned char (*read_byte)(struct device *dev, u32 ofs);
+
+ int type; /* RTC model */
+
+ /* ioaddr mapped externally */
+ void __iomem *ioaddr;
+ /* offset to RTC registers, automatically set according to the type */
+ unsigned int offset;
+};
+
+#endif /* _LINUX_RTC_M48T59_H_ */