On 26 May 2014 18:41, Lucas Stach <l.stach@xxxxxxxxxxxxxx> wrote: Just to mention that I am trying to help you and am not opposing any change. We can add this field if its really required and I am just trying to understand your problem and if we can solve it with current code. > No, setting voltage-tolerance to zero means I don't accept any tolerance > at all. Though in practice I have a variable tolerance as I just have a > fixed maximum voltage for the chip. > > For example the i.MX53 has a fixed maximum voltage of 1.4V on the cpu > rail, so for the slowest OPP the acceptable voltage range is 0.8V to > 1.4V, for the fastest OPP the range is 1.3V to 1.4V. > > So if someone connects a fixed 1.3V regulator, I want to still be able > to use all OPPs, even though the slowest OPP wants 0.8V ideally. If I > were to use a tolerance I would have to set is to some relatively strict > value, in order to not exceed the maximum voltage at the highest OPP, > but this would mean I could not use the slowest OPP because it's out of > the tolerance range. I understood the problem now. But I feel there is nothing imx specific here. It should be a general concern and I want to know how are people working around it currently. IOW can we say that you want tolerance to work only on the positive side? But no tolerance on the -ve side ? Also, your example dts says that you do have different voltage levels for each frequency but actually the regulator may only support a single voltage. i.e. 1.4 volts. -- viresh -- 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
