linux-kernel - [PATCH] drivers: rtc: rv3028: check and update PORF flag during probe

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Message-Id: <20240329101940.1424643-1-karthikeyan@linumiz.com>
Date: Fri, 29 Mar 2024 15:49:40 +0530
From: Karthikeyan Krishnasamy <karthikeyan@...umiz.com>
To: alexandre.belloni@...tlin.com
Cc: linux-rtc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	parthiban@...umiz.com,
	saravanan@...umiz.com,
	Karthikeyan Krishnasamy <karthikeyan@...umiz.com>
Subject: [PATCH] drivers: rtc: rv3028: check and update PORF flag during probe

PORF flag is set during power reset and voltage drop below Vpor
data in rtc device is no longer valid if PORF flag is set
and software must reset to 0, in order to perform sanity
check on rtc data

Signed-off-by: Karthikeyan Krishnasamy <karthikeyan@...umiz.com>
---
 drivers/rtc/rtc-rv3028.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/rtc/rtc-rv3028.c b/drivers/rtc/rtc-rv3028.c
index 2f001c59c61d..e9699ff0c4e8 100644
--- a/drivers/rtc/rtc-rv3028.c
+++ b/drivers/rtc/rtc-rv3028.c
@@ -951,6 +951,13 @@ static int rv3028_probe(struct i2c_client *client)
 	if (ret < 0)
 		return ret;
 
+	if (status & RV3028_STATUS_PORF) {
+		ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
+					 RV3028_STATUS_PORF, 0);
+		if (ret < 0)
+			return ret;
+	}
+
 	if (status & RV3028_STATUS_AF)
 		dev_warn(&client->dev, "An alarm may have been missed.\n");
 
-- 
2.34.1