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The PoE hat supported on the RPi 3B+ and 4B comes with a rather loud fan, tripped in two steps by the brcmstb_thermal thermal_zone driver. Enabling writable trip points allow users to adjust the fan trip points according to their preferred temp/noise ratio. This setting is enabled on most other targets with similar thermal_zone controlled cooling devices. Signed-off-by: Bjørn Mork <bjorn@mork.no>