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rtc: ds1347: use regmap_update_bits

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Use regmap_update_bits instead of open coding. Also add proper error
handling.

Link: https://lore.kernel.org/r/20191007134724.15505-9-alexandre.belloni@bootlin.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Alexandre Belloni 2019-10-07 15:47:23 +02:00
parent d9dcfa5f70
commit 860c45b56d
1 changed files with 6 additions and 4 deletions
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10
drivers/rtc/rtc-ds1347.c
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@ -29,6 +29,8 @@
#define DS1347_STATUS_REG 0x17
#define DS1347_CLOCK_BURST 0x3F
#define DS1347_WP_BIT BIT(7)
#define DS1347_NEOSC_BIT BIT(7)
#define DS1347_OSF_BIT BIT(2)
@ -117,7 +119,7 @@ static int ds1347_probe(struct spi_device *spi)
struct rtc_device *rtc;
struct regmap_config config;
struct regmap *map;
unsigned int data;
int err;
memset(&config, 0, sizeof(config));
config.reg_bits = 8;
@ -141,9 +143,9 @@ static int ds1347_probe(struct spi_device *spi)
spi_set_drvdata(spi, map);
/* Disable the write protect of rtc */
regmap_read(map, DS1347_CONTROL_REG, &data);
data = data & ~(1<<7);
regmap_write(map, DS1347_CONTROL_REG, data);
err = regmap_update_bits(map, DS1347_CONTROL_REG, DS1347_WP_BIT, 0);
if (err)
return err;
rtc = devm_rtc_allocate_device(&spi->dev);
if (IS_ERR(rtc))