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authorChris Packham <chris.packham@alliedtelesis.co.nz>2020-08-17 11:57:31 +1200
committerAlexandre Belloni <alexandre.belloni@bootlin.com>2020-08-21 00:19:04 +0200
commit59ed0127155201863db49f3dc5fb41316433340a (patch)
tree203e2df09579763a919714ac4c0bd6a2c799b2b4 /drivers/rtc
parent163a512cd929d6db712a3021720362749653998b (diff)
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')
-rw-r--r--drivers/rtc/rtc-ds1307.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 54c85cdd019d..2182f4e97c0a 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;
}