Messages in this thread | | | From | Martin Blumenstingl <> | Date | Wed, 3 Jul 2019 01:45:55 +0200 | Subject | Re: [RFC/RFT v3 14/14] arm64: dts: meson-g12b-odroid-n2: enable DVFS |
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On Mon, Jul 1, 2019 at 11:13 AM Neil Armstrong <narmstrong@baylibre.com> wrote: > > Enable DVFS for the Odroid-N2 by setting the clock, OPP and supply > for each cores of each CPU clusters. > > The first cluster uses the "VDDCPU_B" power supply, and the second > cluster uses the "VDDCPU_A" power supply. > > Each power supply can achieve 0.73V to 1.01V using 2 distinct PWM > outputs clocked at 800KHz with an inverse duty-cycle. > > DVFS has been tested by running the arm64 cpuburn at [1] and cycling > between all the possible cpufreq translations of each cluster and > checking the final frequency using the clock-measurer, script at [2]. > > [1] https://github.com/ssvb/cpuburn-arm/blob/master/cpuburn-a53.S > [2] https://gist.github.com/superna9999/d4de964dbc0f84b7d527e1df2ddea25f > > Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
[...] > + vddcpu_b: regulator-vddcpu-b { > + /* > + * Silergy SY8120B1ABC Regulator. > + */ interesting that they use different regulator ICs for CPU A and CPU B the public schematics confirm your comments
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