Add enum value "LPM"

Add the necessary sensor units for the flowmeter in the liquid cooling
system: LPM (L/min).

The "dbus-sensors" package now implements the liquidflow sensor, and
the "xyz.openbmc_project.Sensor.Value" should provide the
"LPM" at enum's of "Unit"-property.

End-user-impact:
The "xyz.openbmc_project.Sensor.Value.Unit" now represents the
"LPM" type of liquidflow sensor values.

Change-Id: Ia6f5d30734472d336abe7bac4b05741f557c8807
Signed-off-by: P.K. Lee <p.k.lee@quantatw.com>
diff --git a/yaml/xyz/openbmc_project/Sensor/Threshold/Critical.interface.yaml b/yaml/xyz/openbmc_project/Sensor/Threshold/Critical.interface.yaml
index c2d548e..81e1c88 100644
--- a/yaml/xyz/openbmc_project/Sensor/Threshold/Critical.interface.yaml
+++ b/yaml/xyz/openbmc_project/Sensor/Threshold/Critical.interface.yaml
@@ -9,6 +9,7 @@
       energy
       fan_tach
       humidity
+      liquidflow
       power
       pressure
       temperature
diff --git a/yaml/xyz/openbmc_project/Sensor/Threshold/HardShutdown.interface.yaml b/yaml/xyz/openbmc_project/Sensor/Threshold/HardShutdown.interface.yaml
index 0329c33..2006a9e 100644
--- a/yaml/xyz/openbmc_project/Sensor/Threshold/HardShutdown.interface.yaml
+++ b/yaml/xyz/openbmc_project/Sensor/Threshold/HardShutdown.interface.yaml
@@ -10,6 +10,7 @@
       energy
       fan_tach
       humidity
+      liquidflow
       power
       pressure
       temperature
diff --git a/yaml/xyz/openbmc_project/Sensor/Threshold/PerformanceLoss.interface.yaml b/yaml/xyz/openbmc_project/Sensor/Threshold/PerformanceLoss.interface.yaml
index 8ce09c1..47c49b4 100644
--- a/yaml/xyz/openbmc_project/Sensor/Threshold/PerformanceLoss.interface.yaml
+++ b/yaml/xyz/openbmc_project/Sensor/Threshold/PerformanceLoss.interface.yaml
@@ -9,6 +9,7 @@
       energy
       fan_tach
       humidity
+      liquidflow
       power
       pressure
       temperature
diff --git a/yaml/xyz/openbmc_project/Sensor/Threshold/SoftShutdown.interface.yaml b/yaml/xyz/openbmc_project/Sensor/Threshold/SoftShutdown.interface.yaml
index 6d7184b..b3635d9 100644
--- a/yaml/xyz/openbmc_project/Sensor/Threshold/SoftShutdown.interface.yaml
+++ b/yaml/xyz/openbmc_project/Sensor/Threshold/SoftShutdown.interface.yaml
@@ -9,6 +9,7 @@
       energy
       fan_tach
       humidity
+      liquidflow
       power
       pressure
       temperature
diff --git a/yaml/xyz/openbmc_project/Sensor/Threshold/Warning.interface.yaml b/yaml/xyz/openbmc_project/Sensor/Threshold/Warning.interface.yaml
index de128f0..efe63cc 100644
--- a/yaml/xyz/openbmc_project/Sensor/Threshold/Warning.interface.yaml
+++ b/yaml/xyz/openbmc_project/Sensor/Threshold/Warning.interface.yaml
@@ -9,6 +9,7 @@
       energy
       fan_tach
       humidity
+      liquidflow
       power
       pressure
       temperature
diff --git a/yaml/xyz/openbmc_project/Sensor/Value.interface.yaml b/yaml/xyz/openbmc_project/Sensor/Value.interface.yaml
index 61db8ec..4196600 100644
--- a/yaml/xyz/openbmc_project/Sensor/Value.interface.yaml
+++ b/yaml/xyz/openbmc_project/Sensor/Value.interface.yaml
@@ -8,6 +8,7 @@
       energy
       fan_tach
       humidity
+      liquidflow
       power
       pressure
       temperature
@@ -47,7 +48,8 @@
           be "Watts". For objects in the pressure namespace, Unit must be
           "Pascals" For objects in the temperature namespace, Unit must be
           "DegreesC". For objects in the utilization namespace, Unit must be
-          "Percent" For objects in the voltage namespace, Unit must be "Volts".
+          "Percent" For objects in the voltage namespace, Unit must be "Volts",
+          For objects in the liquidflow namespace, Unit must be "LPM".
 
 enumerations:
     - name: Unit
@@ -66,6 +68,9 @@
           - name: Joules
             description: >
                 Energy transfer as Joules.
+          - name: LPM
+            description: >
+                To calculate the liquid flow in Liters Per Minute.
           - name: Meters
             description: >
                 Length as meters.
@@ -121,6 +126,8 @@
             value: fan_tach
           - name: Humidity
             value: humidity
+          - name: Liquidflow
+            value: liquidflow
           - name: Power
             value: power
           - name: Pressure