On Wed, Nov 06, 2013 at 02:15:07AM +0000, Rongjun Ying wrote: > If omit voltage-tolerance, sometimes also can't get appropriate voltages. > For example: > If the regulator IC only can supply min voltage is 1.000V and max voltage is 1.200V, and cpu work max voltage is 1.200V. > But the cpu just need 1.100V when cpu run under a freq. > So regulator_set_voltage_tol will return failed. > Because the regulator_set_voltage will invoke with min-uV is 1100000 and max-uV is 1100000 parameters. > Regulator can't supply it. > As this case, the regulator just need supply 1.200V. For given board, what voltages could be provided is known. So you can just define OPP table in <board>.dts and specify the voltage as the value that the regulator IC can supply, e.g. 1.200V in above example. This is not nice, as OPP table is CPU/SoC specific and should be ideally defined in <soc>.dtsi. But still it's a way out for you to use cpufreq-cpu0 driver as it is. In any case, you can not just change voltage-tolerance to voltage-max with no care about the existing users. Shawn -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
