Hi Julian, Julian Calaby schrieb am 03.08.2015 01:35: >> sun7i-a20.dtsi contains an cpufreq operating point at 0.9 volts. Most A20 >> boards >> (or all?), however, do not allow the voltage to go below 1.0V. Thus, raise the >> voltage for the lowest operating point to 1.0V so all boards can actually use >> it. > > Surely it wouldn't be added here if some could supply 0.9v. Maybe. I just know some boards don't (e.g. Cubieboard 2, Cubietruck, BananaPi) and don't know of any that does. But that's not my point. I think that a common minimum operating point, defined on the SOC level, should be defined in a way that works on all boards. > > Is the code that uses this smart enough to sensibly switch between two > operating points with the same frequency and different voltages? If > so, maybe just add a 144MHz @ 1.0v operating point? I never tried and I probably won't have time to test that before the weekend. The current behaviour is this, though: On boards that set their minimum CPU voltage to 1.0V, the lowest operating point will simply not be available to the user. > (Alternatively, would it make sense to modify the code that uses this > to use frequencies with voltages specified that are lower than can be > supplied with the lowest voltage it can?) Considering OPPv2 is in the works, maybe not? Thanks, Timo -- 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
