Fix MD040 warnings

The following warnings are generated by using markdownlint analysis:
```
MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
```
Refer

Fix MD040 warnings

The following warnings are generated by using markdownlint analysis:
```
MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
```
Refer to markdown-lint [1] to fix MD040
[1]: https://github.com/updownpress/markdown-lint/blob/master/rules/040-fenced-code-language.md

Signed-off-by: George Liu <liuxiwei@ieisystem.com>
Change-Id: I456b41fe5f368798cd1d1e78cd83d29b5bb7e236

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pseq: Update documentation

Update the phosphor-power-sequencer documentation to reflect recent
enhancements:
* New JSON configuration file format
* PowerSequencerDevice class hierarchy
* Enhanced pg

pseq: Update documentation

Update the phosphor-power-sequencer documentation to reflect recent
enhancements:
* New JSON configuration file format
* PowerSequencerDevice class hierarchy
* Enhanced pgood isolation support
* Automated tests

Change-Id: I8a7b76f4685cf9d55f1147658cc703b6d558f94b
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 standalone config file parser

Create a standalone JSON configuration file parser for the
phosphor-power-sequencer application. Support the new config file
properties in the parser.

Se

pseq: Create standalone config file parser

Create a standalone JSON configuration file parser for the
phosphor-power-sequencer application. Support the new config file
properties in the parser.

Separating the config file parser from the rest of the code makes it
easier to implement and test.

Create automated test cases to verify the parser functions.

Change-Id: Ia753ffadf395359899964a612e479b00377ad495
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>

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pseq: Document enhanced JSON config file format

The JSON config file format is being enhanced for the
phosphor-power-sequencer application.

The enhancements are intended to provide the following be

pseq: Document enhanced JSON config file format

The JSON config file format is being enhanced for the
phosphor-power-sequencer application.

The enhancements are intended to provide the following benefits:
* Generalize the format so it can be used for any power sequencer
device. The current format is intended only for UCD90XXX devices.
* Remove the "pins" array. Move the GPIO pin information to an optional
property of a rail object. This will eliminate some duplication and
make pgood isolation more flexible.
* Change the meaning of the rail order within the array of rails.
* In the current format, the array index implies the PMBus PAGE. This
causes problems because it is impossible to ignore a PAGE that is
not a valid voltage rail. It also does not provide information
on the power on sequence, which is often different than the PAGE
order.
* In the new format, the rails in the array will be in power on
sequence order. The PMBus page will be explicitly defined using
a new property.
* Add rail property that specifies the PMBus PAGE.
* Add rail property that specifies the pgood status should be obtained
using the PMBus STATUS_VOUT command.
* Add rail property that specifies the pgood status should be obtained
by comparing the output voltage (READ_VOUT) to the undervoltage
(VOUT_UV_FAULT_LIMIT) and overvoltage (VOUT_OV_FAULT_LIMIT) limits.
* Add rail property that specifies the pgood status should be obtained
from a GPIO.

Note: This commit contains only the new JSON file format documentation.
Subsequent commits will contain the new C++ implementation and new
versions of the existing JSON files. The current documentation, C++,
and JSON files will be retained and will remain active until all of the
new support has been merged.

Change-Id: I358a885f1675a9dd8f9ae0115e560abb3c0828fe
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>

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