• Caesar Wang's avatar
    arm64: dts: rockchip: update dynamic-power-coefficient for rk3399 · 45a995c0
    Caesar Wang authored
    This patch updates the dynamic-power-coefficient for big cluster on
    rk3399 SoCs.
    
    The dynamic power consumption of the CPU is proportional to the square of
    the Voltage (V) and the clock frequency (f). The coefficient is used to
    calculate the dynamic power as below -
    Pdyn = dynamic-power-coefficient * V^2 * f
    Where Voltage is in uV, frequency is in MHz.
    
    As the following is the tested data on rk3399's big cluster.
    frequency(MHz)  Voltage(V)  Current(mA) Dynamic-power-coefficient
    24              0.8         15
    48              0.8         23          ~417
    96              0.8         40          ~443
    216             0.8         82          ~438
    312             0.8         115         ~430
    408             0.8         150         ~455
    So the dynamic-power-coefficient average value is about 436.
    Signed-off-by: default avatarCaesar Wang <wxt@rock-chips.com>
    Signed-off-by: default avatarHeiko Stuebner <heiko@sntech.de>
    45a995c0
rk3399.dtsi 51.3 KB