Commit 59ed0127 authored by Chris Packham's avatar Chris Packham Committed by Alexandre Belloni
Browse files

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: default avatarChris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20200816235731.21071-1-chris.packham@alliedtelesis.co.nz
parent 163a512c

drivers/rtc/rtc-ds1307.c

+14 −0
Original line number Diff line number Diff line
@@ -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;

	}