On Thu, 10 Mar 2022 21:58:49 +0100 Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx> wrote: > On 10/03/2022 11:09:18-0500, Hugo Villeneuve wrote: > > On Wed, 9 Mar 2022 17:22:42 +0100 > > Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx> wrote: > > > > > The PCF2127 doesn't support UIE because setting an alarm to fire every > > > second confuses the chip and the fastest we can go is an alarm every 2 > > > seconds. > > > > Hi Alexandre, > > can you describe what "confuses the chip" means? > > > > In my experimental PCF2131 driver, I activated UIE and it seems to be working fine at 1s intervals, but since it is similar to PCF2127, maybe there is still a problem and I just didn't see it. > > > > Did you remove uie_unsupported? Else, you may have been using uie > emulation. In my tests last year, the pcf2127 was failing to reassert > the interrupt if an alarm was set every second. The same happens on > other NXP based RTCs (i.e. including microcrystal ones). Hi, yes, I did remove uie_unsupported, and I specifically disabled UIE emulation in my kernel configuration. > I'm going to test again soon (and also reply to your series). Ok, great. > > Hugo. > > > > > > > Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx> > > > --- > > > drivers/rtc/rtc-pcf2127.c | 1 + > > > 1 file changed, 1 insertion(+) > > > > > > diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c > > > index f8469b134411..63b275b014bd 100644 > > > --- a/drivers/rtc/rtc-pcf2127.c > > > +++ b/drivers/rtc/rtc-pcf2127.c > > > @@ -656,6 +656,7 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap, > > > pcf2127->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; > > > pcf2127->rtc->range_max = RTC_TIMESTAMP_END_2099; > > > pcf2127->rtc->set_start_time = true; /* Sets actual start to 1970 */ > > > + set_bit(RTC_FEATURE_ALARM_RES_2S, pcf2127->rtc->features); > > > clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, pcf2127->rtc->features); > > > clear_bit(RTC_FEATURE_ALARM, pcf2127->rtc->features); > > > > > > -- > > > 2.35.1 > > > > > > > > > -- > > Hugo Villeneuve <hugo@xxxxxxxxxxx> > > -- > Alexandre Belloni, co-owner and COO, Bootlin > Embedded Linux and Kernel engineering > https://bootlin.com > -- Hugo Villeneuve <hugo@xxxxxxxxxxx>
