Re: [RFC/RFT v3 14/14] arm64: dts: meson-g12b-odroid-n2: enable DVFS
From: Neil Armstrong <hidden>
Date: 2019-07-03 11:55:03
Also in:
linux-amlogic, linux-clk, linux-gpio, lkml
On 03/07/2019 01:45, Martin Blumenstingl wrote:
On Mon, Jul 1, 2019 at 11:13 AM Neil Armstrong [off-list ref] wrote:quoted
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 <redacted>Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> [...]quoted
+ 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
Yep they use a Silergy one for VDDCPU_B on every schematics I have. The A311D VIM3 have a slightly different one, but still Silergy for VDDCPU_B. https://dl.khadas.com/Hardware/VIM3/Schematic/VIM3_V11_Sch.pdf Neil _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel