From 83ac40c4b9d848f65e1b9b01eeb4d5be01c97b99 Mon Sep 17 00:00:00 2001
From: CTCaer <ctcaer@gmail.com>
Date: Tue, 12 Mar 2024 15:08:55 +0200
Subject: [PATCH] bdk: rtc: handle offset adjustment in-place

---
 bdk/rtc/max77620-rtc.c | 17 +++++++++++++++++
 bdk/rtc/max77620-rtc.h |  2 ++
 2 files changed, 19 insertions(+)

diff --git a/bdk/rtc/max77620-rtc.c b/bdk/rtc/max77620-rtc.c
index ab01b40..6f813c0 100644
--- a/bdk/rtc/max77620-rtc.c
+++ b/bdk/rtc/max77620-rtc.c
@@ -23,6 +23,8 @@
 #include <soc/timer.h>
 #include <soc/t210.h>
 
+int epoch_offset = 0;
+
 void max77620_rtc_prep_read()
 {
 	i2c_send_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_UPDATE0_REG, MAX77620_RTC_READ_UPDATE);
@@ -154,6 +156,21 @@ u32 max77620_rtc_date_to_epoch(const rtc_time_t *time)
 	return epoch;
 }
 
+void max77620_rtc_get_time_adjusted(rtc_time_t *time)
+{
+	max77620_rtc_get_time(time);
+	if (epoch_offset)
+	{
+		u32 epoch = (u32)((s64)max77620_rtc_date_to_epoch(time) + epoch_offset);
+		max77620_rtc_epoch_to_date(epoch, time);
+	}
+}
+
+void max77620_rtc_set_epoch_offset(int offset)
+{
+	epoch_offset = offset;
+}
+
 void max77620_rtc_set_reboot_reason(rtc_reboot_reason_t *rr)
 {
 	max77620_rtc_stop_alarm();
diff --git a/bdk/rtc/max77620-rtc.h b/bdk/rtc/max77620-rtc.h
index b0d616d..b82c3e6 100644
--- a/bdk/rtc/max77620-rtc.h
+++ b/bdk/rtc/max77620-rtc.h
@@ -109,6 +109,8 @@ typedef struct _rtc_reboot_reason_t
 
 void max77620_rtc_prep_read();
 void max77620_rtc_get_time(rtc_time_t *time);
+void max77620_rtc_get_time_adjusted(rtc_time_t *time);
+void max77620_rtc_set_epoch_offset(int offset);
 void max77620_rtc_stop_alarm();
 void max77620_rtc_epoch_to_date(u32 epoch, rtc_time_t *time);
 u32  max77620_rtc_date_to_epoch(const rtc_time_t *time);