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[Armbian build PR] - Add pwm-fan support to nanopi r4s

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in SBC News

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Description

Add pwm fan support to NanoPi R4S.

Document from FriendlyElec: https://wiki.friendlyelec.com/wiki/index.php/NanoPi_R4S#How_to_Control_Fan_Speed_for_Cooling

And reference code: https://github.com/friendlyarm/kernel-rockchip/commit/f74ac319f02e2d22cdd33227e7f167e4232809f9

How Has This Been Tested?

build and run on R4SE hardware.

  • [x] fan works
  • [x] /sys/devices/virtual/thermal/thermal_zone0/trip_point_[3/4]_temp controls two speed of the fan

Checklist:

  • [x] My code follows the style guidelines of this project
  • [x] I have performed a self-review of my own code
  • [x] 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
  • [x] Any dependent changes have been merged and published in downstream modules

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