diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/rtc/Kconfig | 6 | ||||
| -rw-r--r-- | drivers/rtc/pcf2127.c | 42 |
2 files changed, 27 insertions, 21 deletions
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 57af1b56cb..cb79a01631 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -17,6 +17,10 @@ config RTC_PCF2127 bool "Enable PCF2127 driver" depends on DM_RTC help - Enable pcf2127 driver which provides rtc get and set function + The PCF2127 is a CMOS Real Time Clock (RTC) and calendar with an integrated + Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartz + crystal optimized for very high accuracy and very low power consumption. The PCF2127 + has a selectable I2C-bus or SPI-bus, a backup battery switch-over circuit, a + programmable watchdog function, a timestamp function, and many other features. endmenu diff --git a/drivers/rtc/pcf2127.c b/drivers/rtc/pcf2127.c index bc59c6cda3..dcf0340b4d 100644 --- a/drivers/rtc/pcf2127.c +++ b/drivers/rtc/pcf2127.c @@ -11,21 +11,21 @@ #include <i2c.h> #include <rtc.h> -#define PCF2127_REG_CTRL1 (0x00) -#define PCF2127_REG_CTRL2 (0x01) -#define PCF2127_REG_CTRL3 (0x02) -#define PCF2127_REG_SC (0x03) /* datetime */ -#define PCF2127_REG_MN (0x04) -#define PCF2127_REG_HR (0x05) -#define PCF2127_REG_DM (0x06) -#define PCF2127_REG_DW (0x07) -#define PCF2127_REG_MO (0x08) -#define PCF2127_REG_YR (0x09) +#define PCF2127_REG_CTRL1 0x00 +#define PCF2127_REG_CTRL2 0x01 +#define PCF2127_REG_CTRL3 0x02 +#define PCF2127_REG_SC 0x03 +#define PCF2127_REG_MN 0x04 +#define PCF2127_REG_HR 0x05 +#define PCF2127_REG_DM 0x06 +#define PCF2127_REG_DW 0x07 +#define PCF2127_REG_MO 0x08 +#define PCF2127_REG_YR 0x09 static int pcf2127_rtc_set(struct udevice *dev, const struct rtc_time *tm) { uchar buf[8]; - int i = 0; + int i = 0, ret; /* start register address */ buf[i++] = PCF2127_REG_SC; @@ -44,21 +44,22 @@ static int pcf2127_rtc_set(struct udevice *dev, const struct rtc_time *tm) buf[i++] = bin2bcd(tm->tm_year % 100); /* write register's data */ - if (dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, sizeof(buf)) < 0) - return -1; + ret = dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, sizeof(buf)); - return 0; + return ret; } static int pcf2127_rtc_get(struct udevice *dev, struct rtc_time *tm) { - int rel = 0; + int ret = 0; uchar buf[10] = { PCF2127_REG_CTRL1 }; - if (dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, 1) < 0) - return -1; - if (dm_i2c_read(dev, PCF2127_REG_CTRL1, buf, sizeof(buf)) < 0) - return -1; + ret = dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, 1); + if (ret < 0) + return ret; + ret = dm_i2c_read(dev, PCF2127_REG_CTRL1, buf, sizeof(buf)); + if (ret < 0) + return ret; if (buf[PCF2127_REG_CTRL3] & 0x04) puts("### Warning: RTC Low Voltage - date/time not reliable\n"); @@ -79,12 +80,13 @@ static int pcf2127_rtc_get(struct udevice *dev, struct rtc_time *tm) tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec); - return rel; + return ret; } static int pcf2127_rtc_reset(struct udevice *dev) { /*Doing nothing here*/ + return 0; } |