diff options
Diffstat (limited to 'drivers/rtc/rtc-ds1307.c')
| -rw-r--r-- | drivers/rtc/rtc-ds1307.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c index 64fa1318817c..fdd6f9fda6f9 100644 --- a/drivers/rtc/rtc-ds1307.c +++ b/drivers/rtc/rtc-ds1307.c @@ -195,6 +195,11 @@ struct chip_desc { * the resistor between Vcc and Vbackup? */ bool requires_trickle_resistor; + /* Some RTC's batteries and supercaps were charged by default, others + * allow charging but were not configured previously to do so. + * Remember this behavior to stay backwards compatible. + */ + bool charge_default; }; static const struct chip_desc chips[last_ds_type]; @@ -991,6 +996,7 @@ static const struct chip_desc chips[last_ds_type] = { .trickle_charger_reg = 0x10, .do_trickle_setup = &do_trickle_setup_ds1339, .requires_trickle_resistor = true, + .charge_default = true, }, [ds_1340] = { .century_reg = DS1307_REG_HOUR, @@ -999,6 +1005,7 @@ static const struct chip_desc chips[last_ds_type] = { .do_trickle_setup = &do_trickle_setup_ds1339, .trickle_charger_reg = 0x08, .requires_trickle_resistor = true, + .charge_default = true, }, [ds_1341] = { .century_reg = DS1307_REG_MONTH, @@ -1307,7 +1314,7 @@ static u8 ds1307_trickle_init(struct ds1307 *ds1307, const struct chip_desc *chip) { u32 ohms; - bool diode = true; + bool diode = chip->charge_default; if (!chip->do_trickle_setup) return 0; |