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 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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pseq: Remove output voltage comparison to OV limit

The pgood isolation algorithm for the phosphor-power-sequencer
application is being enhanced to handle more error scenarios.

One major enhancement

pseq: Remove output voltage comparison to OV limit

The pgood isolation algorithm for the phosphor-power-sequencer
application is being enhanced to handle more error scenarios.

One major enhancement is the option to determine the pgood status of a
voltage rail by comparing the output voltage to a fault limit.

The original design was to compare the output voltage to both the
overvoltage limit (VOUT_OV_FAULT_LIMIT) and the undervoltage limit
(VOUT_UV_FAULT_LIMIT).

After discussions with subject matter experts, the design has been
changed to remove the comparison with the overvoltage limit. While this
is important status information, it is not necessarily indicative of a
pgood fault and could lead to false positives.

Change-Id: I664e4b16fcaf32900798c59aeb4e4ed48db964bf
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>

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pseq: Add is_power_supply_rail JSON file property

Enhance the JSON configuration file for the phosphor-power-sequencer
application. Add an "is_power_supply_rail" property to the "rail"
object.

Upd

pseq: Add is_power_supply_rail JSON file property

Enhance the JSON configuration file for the phosphor-power-sequencer
application. Add an "is_power_supply_rail" property to the "rail"
object.

Update the config file documentation, config file parser, Rail class,
and the associated tests.

Change-Id: I3d0e8276324dd9cf25f386016c6f275b540515aa
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>

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pseq: Create Rail class

Create new Rail class for the phosphor-power-sequencer application. The
class contains the properties from the updated JSON config file format.

Create gtests to test all ne

pseq: Create Rail class

Create new Rail class for the phosphor-power-sequencer application. The
class contains the properties from the updated JSON config file format.

Create gtests to test all new code.

Change-Id: Ia55fe3fcc85345deefc1d1987ea1a8421baf50c4
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>

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