The Zynq® UltraScale+™ MPSoC real time clock (RTC) provides the real time even when the device is powered off. When the device is off, the RTC is switched to the battery power supply. A battery-backed RAM (BBRAM) is provided for when device is operating in the battery mode. However, the RTC controller and user interface are only operational when the low-power domain supply is ON. The RTC has an alarm function that generates an alarm at a specific time and date with a 136-year range. The RTC also has periodic software calibration and logic to correct the static fractional inaccuracy of an oscillator.
config RTC_DRV_ZYNQMP tristate "Xilinx Zynq Ultrascale+ MPSoC RTC" depends on OF help If you say yes here you get support for the RTC controller found on Xilinx Zynq Ultrascale+ MPSoC.
[*] EDAC (Error Detection And Correction) reporting ---> [*] Real Time Clock ---> [*] DMA Engine support ---> [*] Auxiliary Display support --->
--- Real Time Clock [*] Set system time from RTC on startup and resume [*] Set the RTC time based on NTP synchronization (NEW) (rtc0) RTC used to set the system time [ ] RTC debug support *** RTC interfaces *** [*] /sys/class/rtc/rtcN (sysfs) [*] /proc/driver/rtc (procfs for rtcN) [*] /dev/rtcN (character devices) [ ] RTC UIE emulation on dev interface < > Test driver/device ........ *** Platform RTC drivers *** ........ < > ST M48T86/Dallas DS12887 < > ST M48T35 < > ST M48T59/M48T08/M48T02 < > Oki MSM6242 (NEW) < > TI BQ4802 < > Ricoh RP5C01 (NEW) < > EM Microelectronic V3020 <*> Xilinx Zynq Ultrascale+ MPSoC RTC (NEW) *** on-CPU RTC drivers ***
1.Get current date and time using "date" command 2.Set date and time using following commanddate -s "2015-09-08 13:36:00" 3. Verify the same using date command again.
This driver is currently in sync with the mainline kernel except for the following:
rtc: zynqmp: Add calibration set and get support