diff options
Diffstat (limited to 'drivers/rtc/rtc-ds1307.c')
| -rw-r--r-- | drivers/rtc/rtc-ds1307.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c index a1cfed6795..726586af4a 100644 --- a/drivers/rtc/rtc-ds1307.c +++ b/drivers/rtc/rtc-ds1307.c @@ -68,6 +68,7 @@ enum ds_type { #define DS1337_REG_CONTROL 0x0e # define DS1337_BIT_nEOSC 0x80 # define DS1339_BIT_BBSQI 0x20 +# define DS1341_BIT_EGFIL 0x20 # define DS3231_BIT_BBSQW 0x40 /* same as BBSQI */ # define DS1337_BIT_RS2 0x10 # define DS1337_BIT_RS1 0x08 @@ -83,6 +84,7 @@ enum ds_type { # define DS1340_BIT_OSF 0x80 #define DS1337_REG_STATUS 0x0f # define DS1337_BIT_OSF 0x80 +# define DS1341_BIT_DOSF 0x40 # define DS1341_BIT_ECLK 0x04 # define DS1337_BIT_A2I 0x02 # define DS1337_BIT_A1I 0x01 @@ -333,12 +335,22 @@ static int ds1307_probe(struct device_d *dev) i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, ds1307->regs[0]); - /* - For the above to be true, DS1341 also has to have - ECLK bit set to 0 - */ if (ds1307->type == ds_1341) { + /* + * For the above to be true, DS1341 also has to have + * ECLK bit set to 0 + */ ds1307->regs[1] &= ~DS1341_BIT_ECLK; + + /* + * Let's set additionale RTC bits to + * facilitate maximum power saving. + */ + ds1307->regs[0] |= DS1341_BIT_DOSF; + ds1307->regs[0] &= ~DS1341_BIT_EGFIL; + + i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, + ds1307->regs[0]); i2c_smbus_write_byte_data(client, DS1337_REG_STATUS, ds1307->regs[1]); } |