Merge tag 'rtc-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux

Pull RTC updates from Alexandre Belloni:
 "This includes new ioctls to get and set parameters and in particular
  the backup switch mode that is needed for some RTCs to actually enable
  the backup voltage (and have a useful RTC).

  The same interface can also be used to get the actual features
  supported by the RTC so userspace has a better way than trying and
  failing.

  Summary:

  Subsystem:
   - Add new ioctl to get and set extra RTC parameters, this includes
     backup switch mode
   - Expose available features to userspace, in particular, when alarmas
     have a resolution of one minute instead of a second.
   - Let the core handle those alarms with a minute resolution

  New driver:
   - MSTAR MSC313 RTC

  Drivers:
   - Add SPI ID table where necessary
   - Add BSM support for rv3028, rv3032 and pcf8523
   - s3c: set RTC range
   - rx8025: set range, implement .set_offset and .read_offset"

* tag 'rtc-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (50 commits)
  rtc: rx8025: use .set_offset/.read_offset
  rtc: rx8025: use rtc_add_group
  rtc: rx8025: clear RTC_FEATURE_ALARM when alarm are not supported
  rtc: rx8025: set range
  rtc: rx8025: let the core handle the alarm resolution
  rtc: rx8025: switch to devm_rtc_allocate_device
  rtc: ab8500: let the core handle the alarm resolution
  rtc: ab-eoz9: support UIE when available
  rtc: ab-eoz9: use RTC_FEATURE_UPDATE_INTERRUPT
  rtc: rv3032: let the core handle the alarm resolution
  rtc: s35390a: let the core handle the alarm resolution
  rtc: handle alarms with a minute resolution
  rtc: pcf85063: silence cppcheck warning
  rtc: rv8803: fix writing back ctrl in flag register
  rtc: s3c: Add time range
  rtc: s3c: Extract read/write IO into separate functions
  rtc: s3c: Remove usage of devm_rtc_device_register()
  rtc: tps80031: Remove driver
  rtc: sun6i: Allow probing without an early clock provider
  rtc: pcf8523: add BSM support
  ...

1 files changed, 65 insertions, 41 deletions

diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index e57d3ca70a78..db529733c9c4 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -127,10 +127,9 @@ static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
 	return ret;
 }
 
-/* Time read/write */
-static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
+/* Read time from RTC and convert it from BCD */
+static int s3c_rtc_read_time(struct s3c_rtc *info, struct rtc_time *tm)
 {
-	struct s3c_rtc *info = dev_get_drvdata(dev);
 	unsigned int have_retried = 0;
 	int ret;
 
@@ -139,54 +138,40 @@ static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
 		return ret;
 
 retry_get_time:
-	rtc_tm->tm_min  = readb(info->base + S3C2410_RTCMIN);
-	rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
-	rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
-	rtc_tm->tm_mon  = readb(info->base + S3C2410_RTCMON);
-	rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
-	rtc_tm->tm_sec  = readb(info->base + S3C2410_RTCSEC);
-
-	/* the only way to work out whether the system was mid-update
+	tm->tm_min  = readb(info->base + S3C2410_RTCMIN);
+	tm->tm_hour = readb(info->base + S3C2410_RTCHOUR);
+	tm->tm_mday = readb(info->base + S3C2410_RTCDATE);
+	tm->tm_mon  = readb(info->base + S3C2410_RTCMON);
+	tm->tm_year = readb(info->base + S3C2410_RTCYEAR);
+	tm->tm_sec  = readb(info->base + S3C2410_RTCSEC);
+
+	/*
+	 * The only way to work out whether the system was mid-update
 	 * when we read it is to check the second counter, and if it
 	 * is zero, then we re-try the entire read
 	 */
-
-	if (rtc_tm->tm_sec == 0 && !have_retried) {
+	if (tm->tm_sec == 0 && !have_retried) {
 		have_retried = 1;
 		goto retry_get_time;
 	}
 
-	rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
-	rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
-	rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
-	rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
-	rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
-	rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
-
 	s3c_rtc_disable_clk(info);
 
-	rtc_tm->tm_year += 100;
-	rtc_tm->tm_mon -= 1;
+	tm->tm_sec  = bcd2bin(tm->tm_sec);
+	tm->tm_min  = bcd2bin(tm->tm_min);
+	tm->tm_hour = bcd2bin(tm->tm_hour);
+	tm->tm_mday = bcd2bin(tm->tm_mday);
+	tm->tm_mon  = bcd2bin(tm->tm_mon);
+	tm->tm_year = bcd2bin(tm->tm_year);
 
-	dev_dbg(dev, "read time %ptR\n", rtc_tm);
 	return 0;
 }
 
-static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
+/* Convert time to BCD and write it to RTC */
+static int s3c_rtc_write_time(struct s3c_rtc *info, const struct rtc_time *tm)
 {
-	struct s3c_rtc *info = dev_get_drvdata(dev);
-	int year = tm->tm_year - 100;
 	int ret;
 
-	dev_dbg(dev, "set time %ptR\n", tm);
-
-	/* we get around y2k by simply not supporting it */
-
-	if (year < 0 || year >= 100) {
-		dev_err(dev, "rtc only supports 100 years\n");
-		return -EINVAL;
-	}
-
 	ret = s3c_rtc_enable_clk(info);
 	if (ret)
 		return ret;
@@ -195,14 +180,48 @@ static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
 	writeb(bin2bcd(tm->tm_min),  info->base + S3C2410_RTCMIN);
 	writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR);
 	writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE);
-	writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON);
-	writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR);
+	writeb(bin2bcd(tm->tm_mon),  info->base + S3C2410_RTCMON);
+	writeb(bin2bcd(tm->tm_year), info->base + S3C2410_RTCYEAR);
 
 	s3c_rtc_disable_clk(info);
 
 	return 0;
 }
 
+static int s3c_rtc_gettime(struct device *dev, struct rtc_time *tm)
+{
+	struct s3c_rtc *info = dev_get_drvdata(dev);
+	int ret;
+
+	ret = s3c_rtc_read_time(info, tm);
+	if (ret)
+		return ret;
+
+	/* Convert internal representation to actual date/time */
+	tm->tm_year += 100;
+	tm->tm_mon -= 1;
+
+	dev_dbg(dev, "read time %ptR\n", tm);
+	return 0;
+}
+
+static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
+{
+	struct s3c_rtc *info = dev_get_drvdata(dev);
+	struct rtc_time rtc_tm = *tm;
+
+	dev_dbg(dev, "set time %ptR\n", tm);
+
+	/*
+	 * Convert actual date/time to internal representation.
+	 * We get around Y2K by simply not supporting it.
+	 */
+	rtc_tm.tm_year -= 100;
+	rtc_tm.tm_mon += 1;
+
+	return s3c_rtc_write_time(info, &rtc_tm);
+}
+
 static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
 	struct s3c_rtc *info = dev_get_drvdata(dev);
@@ -447,15 +466,20 @@ static int s3c_rtc_probe(struct platform_device *pdev)
 
 	device_init_wakeup(&pdev->dev, 1);
 
-	/* register RTC and exit */
-	info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
-					     THIS_MODULE);
+	info->rtc = devm_rtc_allocate_device(&pdev->dev);
 	if (IS_ERR(info->rtc)) {
-		dev_err(&pdev->dev, "cannot attach rtc\n");
 		ret = PTR_ERR(info->rtc);
 		goto err_nortc;
 	}
 
+	info->rtc->ops = &s3c_rtcops;
+	info->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
+	info->rtc->range_max = RTC_TIMESTAMP_END_2099;
+
+	ret = devm_rtc_register_device(info->rtc);
+	if (ret)
+		goto err_nortc;
+
 	ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq,
 			       0, "s3c2410-rtc alarm", info);
 	if (ret) {