kernel/drivers/rtc/rtc-ds1307.c, branch linux-5.1.y

rtc: ds1307: rx8130: Fix alarm handling

2019-02-07T19:55:48Z

When the EXTENSION.WADA bit is set, register 0x19 contains a bitmap of week days, not a day of month. As Linux only handles a single alarm without repetition using day of month is more flexible, so clear this bit. (Otherwise a value depending on time.tm_wday would have to be written to register 0x19.) Also optimize setting the AIE bit to use a single register write instead of a bulk write of three registers. Fixes: ee0981be7704 ("rtc: ds1307: Add support for Epson RX8130CE") Signed-off-by: Uwe Kleine-König Signed-off-by: Alexandre Belloni

rtc: ds1307: rx8130: honor Voltage Loss Flag when reading the time

2019-02-07T19:55:46Z

When voltage dropped since the RTC was last set the reported time is not reliable. In this case return an error indicator instead of a bogus time. Signed-off-by: Uwe Kleine-König Signed-off-by: Alexandre Belloni

rtc: ds1307: correct register offset for rx8130

2019-02-07T19:55:44Z

While rx8130 has a register offset of 0x10 in its chip_desc, this isn't used when regmap accesses are done. So add 0x10 to access the right locations. Fixes: ee0981be7704 ("rtc: ds1307: Add support for Epson RX8130CE") Signed-off-by: Uwe Kleine-König Signed-off-by: Alexandre Belloni

rtc: ds1307: forward declare chips array instead of a bunch of functions

2019-02-07T19:55:41Z

There used to be 16 declarations for static functions. By just adding a declaration for the chips array and reordering the functions the 16 function declarations can be dropped. Signed-off-by: Uwe Kleine-König Signed-off-by: Alexandre Belloni

rtc: ds1307: Move register definitions to start of file

2019-02-07T19:55:39Z

This allows to use the register offsets in all functions which is needed in one of the next patches. Signed-off-by: Uwe Kleine-König Signed-off-by: Alexandre Belloni

rtc: ds1307: fix ds1339 wakealarm support

2018-10-22T15:53:14Z

Commit 51ed73eb998a1c79a2b0e9bed68f75a8a2c93b9b ("rtc: ds1340: Add support for trickle charger.") breaks ds1339 wakealarm support by limiting accessible registers. Fix this. Fixes: 51ed73eb998a ("rtc: ds1340: Add support for trickle charger.") Cc: stable@vger.kernel.org Signed-off-by: Soeren Moch Signed-off-by: Alexandre Belloni

rtc: ds1307: use rtc_add_group

2018-09-28T12:21:01Z

Register frequency test using rtc_add_group to avoid a possible race condition and simplify the code. This also moves the attribute to its proper location under the rtc device instead of the i2c parent device. Signed-off-by: Alexandre Belloni

rtc: ds1307: add frequency_test_enable attribute on m41txx

2018-09-28T12:20:58Z

On m41txx you can enable open-drain OUT pin to check if offset is ok. Enabling OUT pin with frequency_test_enable attribute, OUT pin will tick 512 times faster than 1s tick base. Enable or Disable FT bit on CONTROL register if freq_test is 1 or 0. Signed-off-by: Giulio Benetti Signed-off-by: Alexandre Belloni

rtc: ds1307: add offset sysfs for mt41txx chips.

2018-09-28T12:20:58Z

m41txx chips can hold a calibration value to get correct clock bias. Add offset handling (ranging between -63ppm and 126ppm) via sysfs. Signed-off-by: Giulio Benetti Signed-off-by: Alexandre Belloni

rtc: ds1307: simplify hwmon config

2018-08-16T05:46:41Z

We don't have to define an extra config symbol, IS_REACHABLE does what we need. And having this config symbol just to save the few bytes of hwmon support on non-DS3231 chips isn't worth it IMO (especially as the symbol is set per default). Signed-off-by: Heiner Kallweit Signed-off-by: Alexandre Belloni