rtc: s35390a: set uie_unsupported

Alarms are only supported on a per minute basis. This is why
uie_unsupported is set. Furthermore issue a warning when a second based
alarm is requested.

Signed-off-by: Richard Leitner <richard.leitner@skidata.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

diff --git a/drivers/rtc/rtc-s35390a.c b/drivers/rtc/rtc-s35390a.c
index fb795c4..4ca37f2 100644 (file)
--- a/drivers/rtc/rtc-s35390a.c
+++ b/drivers/rtc/rtc-s35390a.c
@@ -289,6 +289,9 @@ static int s35390a_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
                alm->time.tm_min, alm->time.tm_hour, alm->time.tm_mday,
                alm->time.tm_mon, alm->time.tm_year, alm->time.tm_wday);
 
+       if (alm->time.tm_sec != 0)
+               dev_warn(&client->dev, "Alarms are only supported on a per minute basis!\n");
+
        /* disable interrupt (which deasserts the irq line) */
        err = s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, &sts, sizeof(sts));
        if (err < 0)
@@ -500,6 +503,9 @@ static int s35390a_probe(struct i2c_client *client,
                goto exit_dummy;
        }
 
+       /* supports per-minute alarms only, therefore set uie_unsupported */
+       s35390a->rtc->uie_unsupported = 1;
+
        if (status1 & S35390A_FLAG_INT2)
                rtc_update_irq(s35390a->rtc, 1, RTC_AF);