Messages in this thread | | | Date | Fri, 30 Jun 2017 09:25:33 +0530 | From | Viresh Kumar <> | Subject | Re: [RFC 0/5] drivers: Add boot constraints core |
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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
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