Implemented PSU thermal APIs

Author: Andriy Kokhan

platform/barefoot/sonic-platform-modules-bfn-montara/sonic_platform/psu.py

@@ -201,6 +201,24 @@ def get_position_in_parent(self):
         """
         return self.__index
 
+    def get_temperature(self):
+        """
+        Retrieves current temperature reading from PSU
+        Returns:
+            A float number of current temperature in Celsius up to nearest thousandth
+            of one degree Celsius, e.g. 30.125
+        """
+        return self.get_thermal(0).get_temperature()
+
+    def get_temperature_high_threshold(self):
+        """
+        Retrieves the high threshold temperature of PSU
+        Returns:
+            A float number, the high threshold temperature of PSU in Celsius
+            up to nearest thousandth of one degree Celsius, e.g. 30.125
+        """
+        return self.get_thermal(0).get_high_threshold()
+
     @property
     def _thermal_list(self):
         if self.__thermals is None:

platform/barefoot/sonic-platform-modules-bfn-montara/sonic_platform/thermal.py

@@ -82,8 +82,8 @@ def kv(line):
     @classmethod
     def __sensors_get(cls, cached=True) -> dict:
         cls.__lock.acquire()
-        if time.time() > cls.__timestamp + 5:
-            # Update cache once per 5 seconds
+        if time.time() > cls.__timestamp + 15:
+            # Update cache once per 15 seconds
             try:
                 data = platform_sensors_get(['-A', '-u']) or ''
                 data += subprocess.check_output("/usr/bin/sensors -A -u",