linux-kernel - [PATCH v3 1/2] rtc: rtc-pm8xxx: clear the interrupt in probe

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Date: Thu, 14 Mar 2024 11:33:44 +0800
From: jianbinz <quic_jianbinz@...cinc.com>
To: <alexandre.belloni@...tlin.com>, <a.zummo@...ertech.it>
CC: jianbinz <quic_jianbinz@...cinc.com>, <linux-rtc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 1/2] rtc: rtc-pm8xxx: clear the interrupt in probe

If the alarm is triggered before the driver gets probed, the alarm
interrupt will be missed and it won't be detected, so clear the
stale interrupt in probe.

Changes in v3:
*clear the interrupt in driver probe

Changes in v2:
*Adapt the V1 patch according to the newest rtc-pm8xxx
link to v2: https://lore.kernel.org/linux-rtc/20240124024023df15ef6e@mail.local/

Changes in v1:
*During driver probe: read ALARM_EN, read ALARM_DATA, read RTC_RDATA,
if (ALARM_DATA < RTC_DATA), Trigger the alarm event and clear the alarm settins
Link to v1:https://lore.kernel.org/linux-rtc/20220321090514.4523-1-quic_jianbinz@quicinc.com/

Changes in original:
link to original: https://lore.kernel.org/linux-rtc/YTusgJlMUdXOKQaL@piout.net/

Signed-off-by: jianbinz <quic_jianbinz@...cinc.com>
---
 drivers/rtc/rtc-pm8xxx.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/rtc/rtc-pm8xxx.c b/drivers/rtc/rtc-pm8xxx.c
index f6b779c12ca7..1b5a96924e57 100644
--- a/drivers/rtc/rtc-pm8xxx.c
+++ b/drivers/rtc/rtc-pm8xxx.c
@@ -527,6 +527,10 @@ static int pm8xxx_rtc_probe(struct platform_device *pdev)
 	if (rc)
 		return rc;
 
+	rc = regmap_update_bits(rtc_dd->regmap, rtc_dd->regs->alarm_ctrl2, PM8xxx_RTC_ALARM_CLEAR, 1);
+	if (rc)
+		return rc;
+
 	return 0;
 }
 
-- 
2.17.1