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overlays: Add missing rpi-poe parameters
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The rpi-poe fan overlay has gained two more fan speeds and adjusted
the thresholds and hystereses.

Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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pelwell authored and Phil Elwell committed Apr 1, 2020
1 parent ee25078 commit 8a8e4f3
Showing 1 changed file with 11 additions and 3 deletions.
14 changes: 11 additions & 3 deletions arch/arm/boot/dts/overlays/README
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Original file line number Diff line number Diff line change
Expand Up @@ -2037,12 +2037,20 @@ Name: rpi-poe
Info: Raspberry Pi PoE HAT fan
Load: dtoverlay=rpi-poe,<param>[=<val>]
Params: poe_fan_temp0 Temperature (in millicelcius) at which the fan
turns on (default 50000)
turns on (default 40000)
poe_fan_temp0_hyst Temperature delta (in millicelcius) at which
the fan turns off (default 5000)
the fan turns off (default 2000)
poe_fan_temp1 Temperature (in millicelcius) at which the fan
speeds up (default 55000)
speeds up (default 45000)
poe_fan_temp1_hyst Temperature delta (in millicelcius) at which
the fan slows down (default 2000)
poe_fan_temp2 Temperature (in millicelcius) at which the fan
speeds up (default 50000)
poe_fan_temp2_hyst Temperature delta (in millicelcius) at which
the fan slows down (default 2000)
poe_fan_temp3 Temperature (in millicelcius) at which the fan
speeds up (default 55000)
poe_fan_temp3_hyst Temperature delta (in millicelcius) at which
the fan slows down (default 5000)


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