[uboot] create uboot from github:

repo: https://github.com/u-boot/u-boot
	commit: d80bb749fab53da72c4a0e09b8c2d2aaa3103c91

Change-Id: Ie6434426e1ec15bc08bb1832798e371f3fd5fb29

u-boot-2021.10/arch/sandbox/include/asm/rtc.h

@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Simulate an I2C real time clock
+ *
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#ifndef __asm_rtc_h
+#define __asm_rtc_h
+
+#include <dt-structs.h>
+
+/* Register numbers in the sandbox RTC */
+enum {
+	REG_SEC		= 5,
+	REG_MIN,
+	REG_HOUR,
+	REG_MDAY,
+	REG_MON,
+	REG_YEAR,
+	REG_WDAY,
+
+	REG_RESET	= 0x20,
+
+	REG_AUX0	= 0x30,
+	REG_AUX1,
+	REG_AUX2,
+	REG_AUX3,
+
+	REG_COUNT	= 0x80,
+};
+
+/**
+ * struct sandbox_i2c_rtc_plat_data - platform data for the RTC
+ *
+ * @base_time:		Base system time when RTC device was bound
+ * @offset:		RTC offset from current system time
+ * @use_system_time:	true to use system time, false to use @base_time
+ * @reg:		Register values
+ */
+struct sandbox_i2c_rtc_plat_data {
+#if CONFIG_IS_ENABLED(OF_PLATDATA)
+	struct dtd_sandbox_i2c_rtc_emul dtplat;
+#endif
+	long base_time;
+	long offset;
+	bool use_system_time;
+	u8 reg[REG_COUNT];
+};
+
+struct sandbox_i2c_rtc {
+	unsigned int offset_secs;
+};
+
+#endif