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[Armbian build PR] - use step_wise as the default thermal governor for rockchip-rk3588 legacy


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The default power_allocator governor will not speed up the pwm fan when temp rises up, but step_wise will do according to cooling_level defined in the devicetree. Before this commit I have to set the governor manually by command echo step_wise > /sys/class/thermal/thermal_zone0/policy on rock5b. Since there are many rk3588 boards have pwm-fan node defined in the devicetree, I think it's better to set this governot to default.

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also note any relevant details for your test configuration.

  • [x] No need to manualy set the governor after installing the kernel


  • [x] My code follows the style guidelines of this project
  • [x] I have performed a self-review of my own code
  • [ ] I have commented my code, particularly in hard-to-understand areas
  • [ ] I have made corresponding changes to the documentation
  • [x] My changes generate no new warnings
  • [ ] Any dependent changes have been merged and published in downstream modules

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