Vincent Guittot 29e5f9441b dt-binding: arm/cpus.txt: fix dynamic-power-coefficient unit ... The unit of dynamic-power-coefficient is described as mW/MHz/uV^2 whereas its usage in the code assumes that unit is uW/MHz/V^2 In drivers/thermal/cpu_cooling.c, the code is : power = (u64)capacitance * freq_mhz * voltage_mv * voltage_mv; do_div(power, 1000000000); which can be summarized as : power (mW) = capacitance * freq_mhz/1000 * (voltage_mv/1000)^2 or power (mW) = (capacitance * freq_mhz * (voltage_mv/1000)^2) / 1000 then power (mW) = power (uW) / 1000 so power (uW) = capacitance * freq_mhz * (voltage_mv/1000)^2 Furthermore, if we test basic values like : voltage_mv = 1000mV = 1V freq_mhz = 1000Mhz The minimum possible power, when dynamic-power-coefficient equals 1, will be with current unit: min power = 1 * 1000 * (1000000)^2 = 10^15 mW which is not realistic With the unit used by the code, the min power is min power = 1 * 1000 * 1^2 = 1000uW = 1mW which is far more realistic Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org> Acked-by: Punit Agrawal <punit.agrawal@arm.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rob Herring <robh@kernel.org>		2018-09-26 18:02:41 -05:00
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bindings	dt-binding: arm/cpus.txt: fix dynamic-power-coefficient unit	2018-09-26 18:02:41 -05:00
00-INDEX
booting-without-of.txt
changesets.txt
dynamic-resolution-notes.txt	Documentation: remove dynamic-resolution-notes reference to non-existent file	2018-08-13 08:20:10 -06:00
of_unittest.txt
overlay-notes.txt	of: overlay: Stop leaking resources on overlay removal	2018-04-26 21:18:13 -05:00
todo.txt
usage-model.txt