rtc: rtc-rk808: use flag to distinguish chip differences

RK808\RK818 have November 31st,Other chips fixed the problem.

Fixes: f076ef4 ("rtc: rk808: Compensate for Rockchip calendar
deviation on November 31st")
Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>
Change-Id: I8977a14abcc3973728b5941951d17d493b3955d4

Author: Elaine Zhang

drivers/rtc/rtc-rk808.c

@@ -45,6 +45,7 @@
 #define YEARS_REG_MSK		0xFF
 #define WEEKS_REG_MSK		0x7
 
+#define RTC_NEED_TRANSITIONS	BIT(0)
 /* REG_SECONDS_REG through REG_YEARS_REG is how many registers? */
 
 #define NUM_TIME_REGS	(RK808_WEEKS_REG - RK808_SECONDS_REG + 1)
@@ -63,6 +64,7 @@ struct rk808_rtc {
 	struct rtc_device *rtc;
 	struct rk_rtc_compat_reg *creg;
 	int irq;
+	unsigned int flag;
 };
 
 /*
@@ -147,7 +149,10 @@ static int rk808_rtc_readtime(struct device *dev, struct rtc_time *tm)
 	tm->tm_mon = (bcd2bin(rtc_data[4] & MONTHS_REG_MSK)) - 1;
 	tm->tm_year = (bcd2bin(rtc_data[5] & YEARS_REG_MSK)) + 100;
 	tm->tm_wday = bcd2bin(rtc_data[6] & WEEKS_REG_MSK);
-	rockchip_to_gregorian(tm);
+
+	if (rk808_rtc->flag & RTC_NEED_TRANSITIONS)
+		rockchip_to_gregorian(tm);
+
 	dev_dbg(dev, "RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
 		1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
 		tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec);
@@ -166,7 +171,9 @@ static int rk808_rtc_set_time(struct device *dev, struct rtc_time *tm)
 	dev_dbg(dev, "set RTC date/time %4d-%02d-%02d(%d) %02d:%02d:%02d\n",
 		1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
 		tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec);
-	gregorian_to_rockchip(tm);
+
+	if (rk808_rtc->flag & RTC_NEED_TRANSITIONS)
+		gregorian_to_rockchip(tm);
 
 	if (tm->tm_year < 100 || tm->tm_year > 199) {
 		dev_err(dev, "Unsupported RTC time of tm_year: %d\n",
@@ -230,7 +237,9 @@ static int rk808_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
 	alrm->time.tm_mday = bcd2bin(alrm_data[3] & DAYS_REG_MSK);
 	alrm->time.tm_mon = (bcd2bin(alrm_data[4] & MONTHS_REG_MSK)) - 1;
 	alrm->time.tm_year = (bcd2bin(alrm_data[5] & YEARS_REG_MSK)) + 100;
-	rockchip_to_gregorian(&alrm->time);
+
+	if (rk808_rtc->flag & RTC_NEED_TRANSITIONS)
+		rockchip_to_gregorian(&alrm->time);
 
 	ret = regmap_read(rk808->regmap, rk808_rtc->creg->int_reg, &int_reg);
 	if (ret) {
@@ -288,7 +297,8 @@ static int rk808_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
 		alrm->time.tm_mday, alrm->time.tm_wday, alrm->time.tm_hour,
 		alrm->time.tm_min, alrm->time.tm_sec);
 
-	gregorian_to_rockchip(&alrm->time);
+	if (rk808_rtc->flag & RTC_NEED_TRANSITIONS)
+		gregorian_to_rockchip(&alrm->time);
 
 	if (alrm->time.tm_year < 100 || alrm->time.tm_year > 199) {
 		dev_err(dev, "Unsupported RTC alrm time of tm_year: %d\n",
@@ -447,6 +457,15 @@ static int rk808_rtc_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	switch (rk808->variant) {
+	case RK808_ID:
+	case RK818_ID:
+		rk808_rtc->creg = &rk808_creg;
+		rk808_rtc->flag |= RTC_NEED_TRANSITIONS;
+		break;
+	case RK805_ID:
+	case RK816_ID:
+		rk808_rtc->creg = &rk808_creg;
+		break;
 	case RK809_ID:
 	case RK817_ID:
 		rk808_rtc->creg = &rk817_creg;