pseq: Add named GPIO properties

Add the new named GPIO properties from the JSON config file to the
power sequencer device class hierarchy.

New JSON GPIO properties:
* power_control_gpio_name
* power_good_gpio_name

Power sequencer device class hierarchy:
* PowerSequencerDevice   (power_sequencer_device.*)
  * StandardDevice       (standard_device.*)
    * PMBusDriverDevice  (pmbus_driver_device.*)
      * UCD90xDevice     (ucd90x_device.*)
        * UCD90160Device (ucd90160_device.*)
        * UCD90320Device (ucd90320_device.*)

Tested:
* Ran automated tests. All ran successfully.

Change-Id: Idcccee89eb09cb7d135f45aeb4f6dfe8299adf43
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
diff --git a/phosphor-power-sequencer/src/standard_device.hpp b/phosphor-power-sequencer/src/standard_device.hpp
index 03a6bf0..54c3a01 100644
--- a/phosphor-power-sequencer/src/standard_device.hpp
+++ b/phosphor-power-sequencer/src/standard_device.hpp
@@ -56,12 +56,20 @@
      * @param name device name
      * @param bus I2C bus for the device
      * @param address I2C address for the device
+     * @param powerControlGPIOName name of the GPIO that turns this device on
+     *                             and off
+     * @param powerGoodGPIOName name of the GPIO that reads the power good
+     *                          signal from this device
      * @param rails voltage rails that are enabled and monitored by this device
      */
     explicit StandardDevice(const std::string& name, uint8_t bus,
                             uint16_t address,
+                            const std::string& powerControlGPIOName,
+                            const std::string& powerGoodGPIOName,
                             std::vector<std::unique_ptr<Rail>> rails) :
-        name{name}, bus{bus}, address{address}, rails{std::move(rails)}
+        name{name}, bus{bus}, address{address},
+        powerControlGPIOName{powerControlGPIOName},
+        powerGoodGPIOName{powerGoodGPIOName}, rails{std::move(rails)}
     {}
 
     /** @copydoc PowerSequencerDevice::getName() */
@@ -82,6 +90,18 @@
         return address;
     }
 
+    /** @copydoc PowerSequencerDevice::getPowerControlGPIOName() */
+    virtual const std::string& getPowerControlGPIOName() const override
+    {
+        return powerControlGPIOName;
+    }
+
+    /** @copydoc PowerSequencerDevice::getPowerGoodGPIOName() */
+    virtual const std::string& getPowerGoodGPIOName() const override
+    {
+        return powerGoodGPIOName;
+    }
+
     /** @copydoc PowerSequencerDevice::getRails() */
     virtual const std::vector<std::unique_ptr<Rail>>& getRails() const override
     {
@@ -199,6 +219,16 @@
     uint16_t address;
 
     /**
+     * Name of the GPIO that turns this device on and off.
+     */
+    std::string powerControlGPIOName{};
+
+    /**
+     * Name of the GPIO that reads the power good signal from this device.
+     */
+    std::string powerGoodGPIOName{};
+
+    /**
      * Voltage rails that are enabled and monitored by this device.
      */
     std::vector<std::unique_ptr<Rail>> rails{};