On 19/11/2021 12:07:10+0300, Nikita Shubin wrote:
> Hello Alexandre,
>
> Sorry for the rush - I should have to think more before sending this
> patch ...
>
> On Thu, 18 Nov 2021 10:33:34 +0100
> Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx> wrote:
>
> > Hello,
> >
> > On 18/11/2021 11:40:08+0300, Nikita Shubin wrote:
> > > in case if threaded irq registered successfully - add da9063
> > > as a wakeup source if "wakeup-source" node present in device tree,
> > > set as wakeup capable otherwise.
> > >
> > > Signed-off-by: Nikita Shubin <nikita.shubin@xxxxxxxxxxx>
> > > ---
> > > drivers/rtc/rtc-da9063.c | 10 +++++++++-
> > > 1 file changed, 9 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/rtc/rtc-da9063.c b/drivers/rtc/rtc-da9063.c
> > > index d4b72a9fa2ba..1aceb5ba6992 100644
> > > --- a/drivers/rtc/rtc-da9063.c
> > > +++ b/drivers/rtc/rtc-da9063.c
> > > @@ -490,7 +490,15 @@ static int da9063_rtc_probe(struct
> > > platform_device *pdev) da9063_alarm_event,
> > > IRQF_TRIGGER_LOW |
> > > IRQF_ONESHOT, "ALARM", rtc);
> > > - if (ret)
> > > + if (!ret) {
> > > + if (device_property_present(&pdev->dev,
> > > "wakeup-source")) {
> > > + device_init_wakeup(&pdev->dev, true);
> >
> > If wakeup-source is present, then this should be done regardless of
> > the registration of the interrupt handler. Note that wakeup-source and
> > interrupt are supposed to be mutually exclusive.
> >
>
> We still able to wakeup either ALARM IRQ is present or not.
>
> Actually the only thing is needed in this particular case is the ability
> to set "wakealarm" via sysfs - so we can wakeup from
> POWER-DOWN/DELIVERY/RTC modes, namely shutdown, regardless of CONFIG_PM.
>
> Setting dev->power.can_wakeup to true is enough for that.
>
> On the other hand device_init_wakeup also sets can_wakeup.
>
> May be it's enough to use device_init_wakeup in case if ALARM IRQ is
> present or "wakeup-source" is set ?
>
> I see some construction in drivers/rtc like :
>
> ```
> rtc/rtc-pcf2127.c:673: if (alarm_irq > 0 ||
> device_property_read_bool(dev, "wakeup-source")) {
> rtc/rtc-ab-eoz9.c:552: if (client->irq > 0 ||
> device_property_read_bool(dev, "wakeup-source")) {
> ```
>
Yes, this is what I meant, call device_init_wakeup when an irq has been
successfully requested or wakeup-source is present.
--
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
