linux-kernel - [PATCH] rtc: pcf85363: fix wrong mask/val parameters in regmap_update

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Message-Id: <20231013-topic-pcf85363_regmap_update_bits-v1-1-c454f016f71f@gmail.com>
Date:   Fri, 13 Oct 2023 16:34:21 +0200
From:   Javier Carrasco <javier.carrasco.cruz@...il.com>
To:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     linux-rtc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Javier Carrasco <javier.carrasco.cruz@...il.com>
Subject: [PATCH] rtc: pcf85363: fix wrong mask/val parameters in
 regmap_update_bits call

The current implementation passes PIN_IO_INTA_OUT (2) as a mask and
PIN_IO_INTAPM (GENMASK(1, 0)) as a value.
Swap the variables to assign mask and value the right way.

This error was first introduced with the alarm support. For better or
worse it worked as expected because 0x02 was applied as a mask to 0x03,
resulting 0x02 anyway. This will of course not work for any other value.

Fixes: e5aac267a10a ("rtc: pcf85363: add alarm support")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
 drivers/rtc/rtc-pcf85363.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/rtc/rtc-pcf85363.c b/drivers/rtc/rtc-pcf85363.c
index 06194674d71c..540042b9eec8 100644
--- a/drivers/rtc/rtc-pcf85363.c
+++ b/drivers/rtc/rtc-pcf85363.c
@@ -438,7 +438,7 @@ static int pcf85363_probe(struct i2c_client *client)
 	if (client->irq > 0 || wakeup_source) {
 		regmap_write(pcf85363->regmap, CTRL_FLAGS, 0);
 		regmap_update_bits(pcf85363->regmap, CTRL_PIN_IO,
-				   PIN_IO_INTA_OUT, PIN_IO_INTAPM);
+				   PIN_IO_INTAPM, PIN_IO_INTA_OUT);
 	}
 
 	if (client->irq > 0) {

---
base-commit: 10a6e5feccb877c3c75ad11d27942ad52c24815f
change-id: 20231013-topic-pcf85363_regmap_update_bits-77b3877fa1fa

Best regards,
-- 
Javier Carrasco <javier.carrasco.cruz@...il.com>