diff options
| author | Chris Packham <chris.packham@alliedtelesis.co.nz> | 2020-08-17 11:57:31 +1200 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2020-08-21 00:19:04 +0200 |
| commit | 59ed0127155201863db49f3dc5fb41316433340a (patch) | |
| tree | 203e2df09579763a919714ac4c0bd6a2c799b2b4 /drivers/rtc/rtc-ds1307.c | |
| parent | 163a512cd929d6db712a3021720362749653998b (diff) | |
| download | linux-59ed0127155201863db49f3dc5fb41316433340a.tar.gz | |
rtc: ds1307: Ensure oscillator is enabled for DS1388
Similar to the other variants the DS1388 has a bit to stop the
oscillator to reduce the power consumption from VBAT. Ensure that the
oscillator is enabled when the system is up.
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20200816235731.21071-1-chris.packham@alliedtelesis.co.nz
Diffstat (limited to 'drivers/rtc/rtc-ds1307.c')
| -rw-r--r-- | drivers/rtc/rtc-ds1307.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c index 54c85cdd019dd..2182f4e97c0a3 100644 --- a/drivers/rtc/rtc-ds1307.c +++ b/drivers/rtc/rtc-ds1307.c @@ -153,6 +153,7 @@ enum ds_type { #define DS1388_REG_CONTROL 0x0c # define DS1388_BIT_RST BIT(0) # define DS1388_BIT_WDE BIT(1) +# define DS1388_BIT_nEOSC BIT(7) /* negative offset step is -2.034ppm */ #define M41TXX_NEG_OFFSET_STEP_PPB 2034 @@ -1881,6 +1882,19 @@ static int ds1307_probe(struct i2c_client *client, DS1307_REG_HOUR << 4 | 0x08, hour); } break; + case ds_1388: + err = regmap_read(ds1307->regmap, DS1388_REG_CONTROL, &tmp); + if (err) { + dev_dbg(ds1307->dev, "read error %d\n", err); + goto exit; + } + + /* oscillator off? turn it on, so clock can tick. */ + if (tmp & DS1388_BIT_nEOSC) { + tmp &= ~DS1388_BIT_nEOSC; + regmap_write(ds1307->regmap, DS1388_REG_CONTROL, tmp); + } + break; default: break; } |