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    • 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
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    • Arnd Bergmann's avatar
      Revert "arm64: dts: marvell: add dma-mask in crypto nodes for 7k/8k" · 2b29ca22
      Arnd Bergmann authored
      
      
      As I found by chance while merging another patch, the usage of
      a dma-mask in this DT node is wrong for multiple reasons:
      
      - dma-masks are a Linux specific concept, not a general
        hardware feature
      - In DT, we use the "dma-ranges" property to describe how DMA
        addresses related between devices.
      - The 40-bit mask appears to be completely unnecessary here, as
        the SoC cannot address that much memory anyway, so simply
        asking for a 64-bit mask (as supported by the device) should
        succeed anyway.
      
      The patch to remove the parsing of the property is getting merged
      through the crypto tree.
      
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      2b29ca22