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path: root/drivers/rtc/rtc-zynqmp.c
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2016-05-20rtc: zynqmp: Update seconds time programming logicAnurag Kumar Vulisha
We program RTC time using SET_TIME_WRITE register and read the RTC current time using CURRENT_TIME register. When we set the time by writing into SET_TIME_WRITE Register and immediately try to read the rtc time from CURRENT_TIME register, the previous old value is returned instead of the new loaded time. This is because RTC takes nearly 1 sec to update the new loaded value into the CURRENT_TIME register. This behaviour is expected in our RTC IP. This patch updates the driver to read the current time from SET_TIME_WRITE register instead of CURRENT_TIME when rtc time is requested within an 1sec period after setting the RTC time. Doing so will ensure the correct time is given to the user. Since there is a delay of 1sec in updating the CURRENT_TIME we are loading set time +1sec while programming the SET_TIME_WRITE register, doing this will give correct time without any delay when read from CURRENT_TIME. Signed-off-by: Anurag Kumar Vulisha <anuragku@xilinx.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-05-20rtc: zynqmp: Write Calibration value before setting timeAnurag Kumar Vulisha
It is suggested to program CALIB_WRITE register with the calibration value before updating the SET_TIME_WRITE register, doing so will clear the Tick Counter and force the next second to be signaled exactly in 1 second. Signed-off-by: Anurag Kumar Vulisha <anuragku@xilinx.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-05-20rtc: zynqmp: Enable RTC switching to battery power when VCC_PSAUX is N/AAnurag Kumar Vulisha
In order to conserve battery energy, during the PS operation, it is expected that the supply for the battery-powered domain to be switched from the battery (VCC_PSBATT) to (VCC_PSAUX) and automatically be switched back to battery when VCC_PSAUX voltage drops below a limit, doing so prevents the logic within the battery-powered domain from functioning incorrectly. Signed-off-by: Anurag Kumar Vulisha <anuragku@xilinx.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2015-09-05rtc: add xilinx zynqmp rtc driverSuneel Garapati
Add support for RTC controller found on Xilinx Zynq Ultrascale+ MPSoC platform. Signed-off-by: Suneel Garapati <suneel.garapati@xilinx.com> Acked-by: Moritz Fischer <moritz.fischer@ettus.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>