On 30-06-17, 11:33, Chen-Yu Tsai wrote: > AFAIK regulator constraints are supposed to satisfy all users of it.
Right. > >> >Let me try with an example. A regulator is shared between LCD and DMA > >> >controller. > >> > > >> >Operable ranges of the regulator: 1.8 - 3.0 V > >> >Range required by LCD: 2.0 - 3.0 V > >> >Range required by DMA: 1.8 - 2.5 V > > So for the example here, the regulator constraint should be 2.5 - 3.0 V, > or the intersection of all voltage requirements. Had a look at regulator_check_consumers() and the range selected by it is the *highest* min_uV and *lowest* max_uV, to find that intersection point. For LCD: min_uV = 2.0 V, max_uV = 3.0 V For DMA: min_uV = 1.8 V, max_uV = 2.5 V Highest min_uV = 2.0 V Lowest max_uV = 2.5 V And so I mentioned the regulator's final range (that satisfies all consumers) is 2 - 2.5 V. Why do you say it should be 2.5 - 3.0 V ? -- viresh
