On 26/09/2018 10:47:08-0500, Rob Herring wrote: > > > +Optional property: > > > +- nxp,quartz_load_12.5pF: The capacitive load on the quartz is 12.5 pF, > > > + which differ from the default value of 7 pF > > > + > > > > The boolean properties usually don't work well for RTCs because people > > usually want to keep any previous configuration that may have been done > > at the factory or in the bootloader so I would use: > > > > nxp,quartz_load_fF and this would be either 7000 or 12500. > > Use '-' rather than '_'. > > There's already a defined unit suffix of '-picofarads'. If you need > '-femtofarads', then please add to property-units.txt. Though I'd prefer > not as wouldn't a value of 12 (or 13) be close enough for the needs > here? > For that particular RTC, yes but the isl1208 has 0.5pF steps and the x1205 has 0.25pf steps. I'd prefer having a single generic property for all the RTCs: quartz-load-femtofarads. -- Alexandre Belloni, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
