Add frequency sensors to Nibe (#89072)

* added frequency (for compressors etc)

---------

Co-authored-by: Joakim Plate <elupus@ecce.se>

homeassistant/components/nibe_heatpump/sensor.py

@@ -16,6 +16,7 @@ from homeassistant.const import (
     UnitOfElectricCurrent,
     UnitOfElectricPotential,
     UnitOfEnergy,
+    UnitOfFrequency,
     UnitOfPower,
     UnitOfTemperature,
     UnitOfTime,
@@ -110,6 +111,13 @@ UNIT_DESCRIPTIONS = {
         state_class=SensorStateClass.TOTAL_INCREASING,
         native_unit_of_measurement=UnitOfTime.HOURS,
     ),
+    "Hz": SensorEntityDescription(
+        key="Hz",
+        entity_category=EntityCategory.DIAGNOSTIC,
+        device_class=SensorDeviceClass.FREQUENCY,
+        state_class=SensorStateClass.MEASUREMENT,
+        native_unit_of_measurement=UnitOfFrequency.HERTZ,
+    ),
 }