lkml.org 
[lkml]   [2022]   [Jan]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Date
Subject[PATCH] rtc: pcf2127: add error checking and message when disabling POR0
From: Hugo Villeneuve <hvilleneuve@dimonoff.com>

If PCF2127 device is absent from the I2C bus, or if there is a
communication problem, disabling POR0 may fail silently and we
still continue with probing the device. In that case, abort probe
operation and display an error message.

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
---
drivers/rtc/rtc-pcf2127.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c
index 81a5b1f2e68c..e6d0838ccfe3 100644
--- a/drivers/rtc/rtc-pcf2127.c
+++ b/drivers/rtc/rtc-pcf2127.c
@@ -690,8 +690,12 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
* The "Power-On Reset Override" facility prevents the RTC to do a reset
* after power on. For normal operation the PORO must be disabled.
*/
- regmap_clear_bits(pcf2127->regmap, PCF2127_REG_CTRL1,
+ ret = regmap_clear_bits(pcf2127->regmap, PCF2127_REG_CTRL1,
PCF2127_BIT_CTRL1_POR_OVRD);
+ if (ret < 0) {
+ dev_err(dev, "PORO disabling failed\n");
+ return ret;
+ }

ret = regmap_read(pcf2127->regmap, PCF2127_REG_CLKOUT, &val);
if (ret < 0)
--
2.30.2
\
 
 \ /
  Last update: 2022-01-17 23:57    [W:0.083 / U:0.020 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site