kernel/drivers/rtc/rtc-pcf8523.c, branch linux-5.1.y

rtc: pcf8523: set xtal load capacitance from DT

2019-01-22T17:57:08Z

Add support for specifying the xtal load capacitance in the DT node. The pcf8523 supports xtal load capacitance of 7pF or 12.5pF. If the rtc has the wrong configuration the time will drift several hours/week. The driver use the default value 12.5pF. The DT may specify either 7000fF or 12500fF. (The DT uses femto Farad to avoid decimal numbers). Other values are warned and the driver uses the default value. Signed-off-by: Sam Ravnborg Cc: Alessandro Zummo Cc: Alexandre Belloni Signed-off-by: Alexandre Belloni

rtc: pcf8523: Add rv8523 compatible

2019-01-10T20:51:24Z

The Microcrystal RV-8523 is compatible with the PCF8523. Signed-off-by: Alexandre Belloni

rtc: pcf8523: don't return invalid date when battery is low

2018-12-10T23:46:53Z

The RTC_VL_READ ioctl reports the low battery condition. Still, pcf8523_rtc_read_time() happily returns invalid dates in this case. Check the battery health on pcf8523_rtc_read_time() to avoid that. Reported-by: Erik Čuk Signed-off-by: Baruch Siach Signed-off-by: Alexandre Belloni

rtc: stop validating rtc_time in .read_time

2018-03-02T09:09:58Z

The RTC core is always calling rtc_valid_tm after the read_time callback. It is not necessary to call it just before returning from the callback. Signed-off-by: Alexandre Belloni

rtc: pcf8523: add support for trimming the RTC oscillator

2017-10-25T21:05:52Z

Add support for reading and writing the RTC offset register, converting it to the corresponding parts-per-billion value. When setting the drift, the PCF8523 has two modes: one applies the adjustment every two hours, the other applies the adjustment every minute. We select between these two modes according to which ever gives the closest PPB value to the one requested. Signed-off-by: Russell King Signed-off-by: Alexandre Belloni

rtc: pcf8523: properly handle oscillator stop bit

2016-03-14T16:08:30Z

The time and date register of the pcf8223 are undefined after a power reset. Properly handle the OS bit and return -EINVAL when that bit is set. It is properly removed when setting the time. This solves an issue where the time and date may be valid for rtc_valid_tm() but is not the current time. Signed-off-by: Alexandre Belloni

rtc: pcf8523: refuse to write dates later than 2099

2016-01-11T19:19:54Z

When the chip increments the YEAR register and it already holds bin2bcd(99) it reads as 0 afterwards. With this behaviour the last valid day (without trickery) that has a representation is 2099-12-31 23:59:59. So refuse to write later dates. Signed-off-by: Uwe Kleine-König Signed-off-by: Alexandre Belloni

rtc: Drop owner assignment from i2c_driver

2015-09-05T11:19:06Z

i2c_driver does not need to set an owner because i2c_register_driver() will set it. Signed-off-by: Krzysztof Kozlowski Signed-off-by: Alexandre Belloni

drivers/rtc/rtc-pcf8523.c: fix month definition

2014-05-06T20:04:58Z

PCF8523 uses 1-12 to represent month according to datasheet. link: www.nxp.com/documents/data_sheet/PCF8523.pdf. Signed-off-by: Chris Cui Cc: Alessandro Zummo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

drivers/rtc/rtc-pcf8523.c: remove empty function

2013-07-03T23:07:57Z

After the switch to devm_* functions and the removal of rtc_device_unregister(), the 'remove' function does not do anything. Delete it. Signed-off-by: Sachin Kamat Acked-by: Thierry Reding Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds