Re: [PATCH 1/3] dt-bindings: rtc: Add sii,wakealarm-output-pin property for S35390A

[Alexandre Belloni <alexandre.belloni@bootlin.com>]

On 02/07/2026 10:20:20+0200, Krzysztof Kozlowski wrote:
> On 02/07/2026 10:17, Alexandre Belloni wrote:
> > On 02/07/2026 08:09:55+0200, Krzysztof Kozlowski wrote:
> >>>> Then you need proper wakeup-source support
> >>> Wouldn't that break existing devicetrees?
> >>
> >> How?
> >>
> >>>
> >>> The current driver allows to wake up the system, even without
> >>> having wakeup-source set.
> >>
> >> Anyway, wakeup-source is already there in rtc, so this would be done. I
> >> don't get though, why there is no benefit of routing it to interrupt
> >> controller (interrupt controllers do wake up the system). Additionally,
> >> if you do not connect it to any interrupt, then how does it wake up the
> >> system?
> >>
> > 
> > Some systems are routing the interrupt output of the RTC directly to the
> > PMIC and the PMIC is the one responsible for waking the rest of the
> > system, including the SoC.
> 
> Yeah, then the PMIC has interrupt line to the SoC and the PMIC is the
> wakeup-source, not RTC.
> 

This would be case 3 of Documentation/devicetree/bindings/power/wakeup-source.txt

> Best regards,
> Krzysztof

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com