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rtc: ds1307: handle oscillator failure flags for ds1388 variant

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The FLAG register is at a different location to the other supported RTCs
so this requires an extra case in the existing switch statement.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Link: https://lore.kernel.org/r/20200207031812.14424-2-chris.packham@alliedtelesis.co.nz
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Chris Packham 2020-02-07 16:18:11 +13:00 committed by Alexandre Belloni
parent 30a790653d
commit df11b323b1
1 changed files with 9 additions and 0 deletions
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9
drivers/rtc/rtc-ds1307.c
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@ -144,6 +144,8 @@ enum ds_type {
# define M41TXX_BIT_CALIB_SIGN BIT(5)
# define M41TXX_M_CALIBRATION GENMASK(4, 0)
#define DS1388_REG_FLAG 0x0b
# define DS1388_BIT_OSF BIT(7)
/* negative offset step is -2.034ppm */
#define M41TXX_NEG_OFFSET_STEP_PPB 2034
/* positive offset step is +4.068ppm */
@ -252,6 +254,13 @@ static int ds1307_get_time(struct device *dev, struct rtc_time *t)
if (tmp & DS1340_BIT_OSF)
return -EINVAL;
break;
case ds_1388:
ret = regmap_read(ds1307->regmap, DS1388_REG_FLAG, &tmp);
if (ret)
return ret;
if (tmp & DS1388_BIT_OSF)
return -EINVAL;
break;
case mcp794xx:
if (!(tmp & MCP794XX_BIT_ST))
return -EINVAL;