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rtc: sc27xx: Add check to see if need to enable the alarm interrupt

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The RTC interrupt enable register is not put in always-power-on region
supplied by VDDRTC, so we should check if we need enable the alarm
interrupt when system booting.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Baolin Wang 2018-10-18 16:52:29 +08:00 committed by Alexandre Belloni
parent b2ddc48582
commit bf2c532b67
1 changed files with 33 additions and 0 deletions
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33
drivers/rtc/rtc-sc27xx.c
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@ -563,6 +563,32 @@ static int sprd_rtc_check_power_down(struct sprd_rtc *rtc)
return 0;
}
static int sprd_rtc_check_alarm_int(struct sprd_rtc *rtc)
{
u32 val;
int ret;
ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_SPG_VALUE, &val);
if (ret)
return ret;
/*
* The SPRD_RTC_INT_EN register is not put in always-power-on region
* supplied by VDDRTC, so we should check if we need enable the alarm
* interrupt when system booting.
*
* If we have set SPRD_RTC_POWEROFF_ALM_FLAG which is saved in
* always-power-on region, that means we have set one alarm last time,
* so we should enable the alarm interrupt to help RTC core to see if
* there is an alarm already set in RTC hardware.
*/
if (!(val & SPRD_RTC_POWEROFF_ALM_FLAG))
return 0;
return regmap_update_bits(rtc->regmap, rtc->base + SPRD_RTC_INT_EN,
SPRD_RTC_ALARM_EN, SPRD_RTC_ALARM_EN);
}
static int sprd_rtc_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
@ -596,6 +622,13 @@ static int sprd_rtc_probe(struct platform_device *pdev)
rtc->dev = &pdev->dev;
platform_set_drvdata(pdev, rtc);
/* check if we need set the alarm interrupt */
ret = sprd_rtc_check_alarm_int(rtc);
if (ret) {
dev_err(&pdev->dev, "failed to check RTC alarm interrupt\n");
return ret;
}
/* check if RTC time values are valid */
ret = sprd_rtc_check_power_down(rtc);
if (ret) {