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Commit 9092984f authored by Anurag Kumar Vulisha's avatar Anurag Kumar Vulisha Committed by Alexandre Belloni
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rtc: zynqmp: Enable RTC switching to battery power when VCC_PSAUX is N/A 



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: default avatarAnurag Kumar Vulisha <anuragku@xilinx.com>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
parent 19105f42

drivers/rtc/rtc-zynqmp.c

+8 −0
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ 
#define RTC_INT_SEC		BIT(0)

#define RTC_INT_ALRM		BIT(1)

#define RTC_OSC_EN		BIT(24)

#define RTC_BATT_EN		BIT(31)



#define RTC_CALIB_DEF		0x198233

#define RTC_CALIB_MASK		0x1FFFFF
@@ -122,6 +123,13 @@ static int xlnx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) 


static void xlnx_init_rtc(struct xlnx_rtc_dev *xrtcdev, u32 calibval)

{

	u32 rtc_ctrl;



	/* Enable RTC switch to battery when VCC_PSAUX is not available */

	rtc_ctrl = readl(xrtcdev->reg_base + RTC_CTRL);

	rtc_ctrl |= RTC_BATT_EN;

	writel(rtc_ctrl, xrtcdev->reg_base + RTC_CTRL);



	/*

	 * Based on crystal freq of 33.330 KHz

	 * set the seconds counter and enable, set fractions counter