On 27/01/2021 14:07:59+0100, Rasmus Villemoes wrote: > On 26/01/2021 23.48, Alexandre Belloni wrote: > > On 21/12/2020 22:17:54+0100, Rasmus Villemoes wrote: > >> On 19/12/2020 02.34, Alexandre Belloni wrote: > >>> pcf2127, pcf2129 and pca2129 support start-year and reset-source. > >>> > >> > >> No, the 2129 variant doesn't even have a reset output pin. Not sure if > >> there's any way to reflect that, and it probably doesn't matter, since > >> nobody's going to add the reset-source property to a 2129 node. But the > >> commit message is a bit misleading. > >> > > > > Actually no, the INT pin can be used as a reset, the pcf/pca2129 > > can be used as a watchdog and so it may need the reset-source property. > > Unless I'm missing something, that would require some rather creative > extra circuitry: The interrupt pin is kept low until the appropriate bit > in the rtc is cleared, so if that is routed directly to a reset pin on > the SOC, the SOC would be kept in reset indefinitely. > You mean inverting the level of INT? I don't think this is creative or complicated... And anyway, INT# is active low, like RST# so if the SoC has an RST# input, this should just work. -- Alexandre Belloni, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
