pseq: Check STATUS_VOUT first to find pgood fault

Enhance the support for finding the correct voltage rail when a pgood
fault occurs.

First check the PMBus STATUS_VOUT register for all rails. Chec

pseq: Check STATUS_VOUT first to find pgood fault

Enhance the support for finding the correct voltage rail when a pgood
fault occurs.

First check the PMBus STATUS_VOUT register for all rails. Check the
rails in power-on-sequence order.

Checking STATUS_VOUT is usually the most accurate method. For example,
if a pgood fault occurs, the power sequencer device may automatically
shut off related rails. Ideally the device will only set fault bits in
STATUS_VOUT for the rail with the pgood fault. However, all the related
rails will likely appear to be faulted by the other methods.

If no fault is found by checking STATUS_VOUT, then check the GPIOs and
output voltage for all rails. Check the rails in power-on-sequence
order.

Tested:
* Verified all automated test cases run successfully.

Change-Id: Ida8732db573013f1b72edac8ed54e3cfc38da146
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>

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pseq: Add getRails() method to device hierarchy

Add a method to get the voltage rails that are being enabled/monitored
by a power sequencer device.

Tested:
* Verified all gtests ran successfully

C

pseq: Add getRails() method to device hierarchy

Add a method to get the voltage rails that are being enabled/monitored
by a power sequencer device.

Tested:
* Verified all gtests ran successfully

Change-Id: I04b3e9b0854c110858daf30dbf35dc44ab4ade0e
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>

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pseq: Add pgood fault detection to Rail class

Add power good (pgood) fault detection to the Rail class in the
phosphor-power-sequencer application.

Implement the checking defined in the JSON config

pseq: Add pgood fault detection to Rail class

Add power good (pgood) fault detection to the Rail class in the
phosphor-power-sequencer application.

Implement the checking defined in the JSON configuration file:
* Check for fault bits set in STATUS_VOUT
* Check for a GPIO with the wrong value
* Check if the output voltage (READ_VOUT) is below the undervoltage
limit (VOUT_UV_FAULT_LIMIT)

If a pgood fault is detected, capture the relevant debug information
such as the rail name and STATUS_WORD value.

Tested:
* Added gtests for the new code
* Ran all gtests and verified they passed

Change-Id: I09c3ed6c504fe907a7854a4ac462a2bc4a8b806f
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>

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