avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/drivers/rtc/mc13xxx-rtc.c

@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2008, Guennadi Liakhovetski <lg@denx.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <rtc.h>
+#include <spi.h>
+#include <power/pmic.h>
+#include <fsl_pmic.h>
+
+int rtc_get(struct rtc_time *rtc)
+{
+	u32 day1, day2, time;
+	int tim, i = 0;
+	struct pmic *p = pmic_get("FSL_PMIC");
+	int ret;
+
+	if (!p)
+		return -1;
+	do {
+		ret = pmic_reg_read(p, REG_RTC_DAY, &day1);
+		if (ret < 0)
+			return -1;
+
+		ret = pmic_reg_read(p, REG_RTC_TIME, &time);
+		if (ret < 0)
+			return -1;
+
+		ret = pmic_reg_read(p, REG_RTC_DAY, &day2);
+		if (ret < 0)
+			return -1;
+
+	} while (day1 != day2 && i++ < 3);
+
+	tim = day1 * 86400 + time;
+
+	rtc_to_tm(tim, rtc);
+
+	rtc->tm_yday = 0;
+	rtc->tm_isdst = 0;
+
+	return 0;
+}
+
+int rtc_set(struct rtc_time *rtc)
+{
+	u32 time, day;
+	struct pmic *p = pmic_get("FSL_PMIC");
+	if (!p)
+		return -1;
+
+	time = rtc_mktime(rtc);
+	day = time / 86400;
+	time %= 86400;
+
+	pmic_reg_write(p, REG_RTC_DAY, day);
+	pmic_reg_write(p, REG_RTC_TIME, time);
+
+	return 0;
+}
+
+void rtc_reset(void)
+{
+}