Hi! > > >> + io-channels = <&twl_madc 1>, > > >> + <&twl_madc 10>, > > >> + <&twl_madc 12>; > > >> + io-channel-names = "temp", > > >> + "ichg", > > >> + "vbat"; > > >> + }; > > > > > > Rather than just making platform_data into device tree properties.. > > > > > > Can't you hide the these custom properties behind the compatible flag? > > > > > > You can initialize that data in the driver based on the compatible > > > flag and the match data. > > > > > > This makes sense if you can group things to similar configurations. > > > > Maybe I have not completely understood your proposal. > > > > Do you mean to go back to have big parameter tables for each device/battery > > combination in the driver code and the compatible flag (e.g. compatible = “board17”) > > chooses the right data set for the charging map and channels? > > If you can somehow group them, then yes. Not for every board if there > are many of them naturally. > > > I thought this is what the DT was introduced for - to have the same driver > > code but adapt to different boards depending on hardware variations. > > Yeah but you also need to consider the issues related to introducing > new device tree properties. The device tree properties introduced > should be generic where possible. > > > And batteries have very different characteristics and vary between devices… > > Right. Maybe that has been already agreed on to use capacity-uah for > batteries in general? In that case I have not problem with that as > it's a generic property :) > > > The charging maps are depending on the battery type connected to the twl4030 > > and which madc channel is which value is also a little hardware dependent > > (although the twl4030 doesn’t give much choice). > > Just to consider alternatives before introducing driver specific > property for the maps.. Maybe here you could have few different type > of maps and select something safe by default? Of course it could be this > is higly board specific, I think some devices may be able to run below > 3.3V for example.. As I explained in some other mail, those tables should not be neccessary at all. They can be computed from li-ion characteristics and internal resistance, and assumed current during charge and discharge. Running below 3.3V.. not really. At that point, the battery is really _empty_, and voltage is going down really really fast. Plus, you are damaging the battery at that point. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
