On Tue, Aug 23, 2016 at 12:17:23PM +0800, Chen-Yu Tsai wrote: > On Tue, Aug 23, 2016 at 2:09 AM, Mark Brown <broonie@xxxxxxxxxx> wrote: > > Sure, but the constraints also say that you can do 1.32V which the > > system is not physically capable of delivering. That's not a good sign > > for the constraints, it suggests that at least the capabilities of the > > regulator have not been taken into consideration when setting up the > > constraints. > So to be clear, the constraints should be the intersection of the > recommended operating parameters of the consumer and the regulator's > output, with the voltage/current steps taken in to consideration. The constraints are there to say what the *system* can deliver. That includes the limitations of the consumers, the regulators and the physical design of the board. Just as one shouldn't just throw in the maximum voltage range that the regulator can deliver one also shouldn't just use the maximum voltage range a consumer can support for similar reasons.
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