overlays: add overrides for PoE HAT fan control

Signed-off-by: Serge Schneider <serge@raspberrypi.org>

diff --git a/arch/arm/boot/dts/overlays/README b/arch/arm/boot/dts/overlays/README
index 018dc5d..ab70c05 100644 (file)
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -1565,9 +1565,16 @@ Params: touchscreen-size-x      Touchscreen X resolution (default 800)
 
 
 Name:   rpi-poe
-Info:   Raspberry Pi POE HAT
-Load:   dtoverlay=rpi-poe
-Params: <None>
+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)
+        poe_fan_temp0_hyst      Temperature delta (in millicelcius) at which
+                                the fan turns off (default 5000)
+        poe_fan_temp1           Temperature (in millicelcius) at which the fan
+                                speeds up (default 55000)
+        poe_fan_temp1_hyst      Temperature delta (in millicelcius) at which
+                                the fan slows down (default 5000)
 
 
 Name:   rpi-proto

diff --git a/arch/arm/boot/dts/overlays/rpi-poe-overlay.dts b/arch/arm/boot/dts/overlays/rpi-poe-overlay.dts
index f24af60..1dacd3b 100644 (file)
--- a/arch/arm/boot/dts/overlays/rpi-poe-overlay.dts
+++ b/arch/arm/boot/dts/overlays/rpi-poe-overlay.dts
@@ -50,4 +50,14 @@
                        };
                };
        };
+
+       fragment@2 {
+               target-path = "/__overrides__";
+               __overlay__ {
+                       poe_fan_temp0 =         <&trip0>,"temperature:0";
+                       poe_fan_temp0_hyst =    <&trip0>,"hysteresis:0";
+                       poe_fan_temp1 =         <&trip1>,"temperature:0";
+                       poe_fan_temp1_hyst =    <&trip1>,"hysteresis:0";
+               };
+       };
 };