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rtc: pm8xxx: Read ALARM_EN and update to alarm enabled status 

ALARM_EN status is retained in PMIC register after device shutdown
if poweron_alarm is enabled. Read it to make sure the driver has
consistent value with the register status.

Signed-off-by: Guixiong Wei <guixiong@codeaurora.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/1608809337-18852-1-git-send-email-guixiong@codeaurora.org
This commit is contained in:
Guixiong Wei 2020-12-24 19:28:57 +08:00 committed by Alexandre Belloni
parent 5c8fe583cc
commit 121f54efc3
1 changed files with 9 additions and 0 deletions
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9
drivers/rtc/rtc-pm8xxx.c
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@ -20,6 +20,7 @@
/* RTC_CTRL register bit fields */
#define PM8xxx_RTC_ENABLE BIT(7)
#define PM8xxx_RTC_ALARM_CLEAR BIT(0)
#define PM8xxx_RTC_ALARM_ENABLE BIT(7)
#define NUM_8_BIT_RTC_REGS 0x4
@ -265,6 +266,7 @@ rtc_rw_fail:
static int pm8xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
int rc;
unsigned int ctrl_reg;
u8 value[NUM_8_BIT_RTC_REGS];
unsigned long secs;
struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
@ -282,6 +284,13 @@ static int pm8xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
rtc_time64_to_tm(secs, &alarm->time);
rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl, &ctrl_reg);
if (rc) {
dev_err(dev, "Read from RTC alarm control register failed\n");
return rc;
}
alarm->enabled = !!(ctrl_reg & PM8xxx_RTC_ALARM_ENABLE);
dev_dbg(dev, "Alarm set for - h:m:s=%ptRt, y-m-d=%ptRdr\n",
&alarm->time, &alarm->time);