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ACPI: property: graph: Improve graph documentation for port/ep numbering

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Document that if a port has a single endpoint only, its value shall be
zero. Similarly, if a device object only has a single port, its value
shlla be zero.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Sakari Ailus 2018-07-17 17:19:20 +03:00 committed by Rafael J. Wysocki
parent e58b1c6a94
commit e49363e96f
1 changed files with 4 additions and 1 deletions
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5
Documentation/acpi/dsd/graph.txt
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@ -55,7 +55,10 @@ endpoint. An example of such a package would be:
Each port node contains a property extension key "port", the value of
which is the number of the port. Each endpoint is similarly numbered
with a property extension key "endpoint". Port numbers must be unique within a
device and endpoint numbers must be unique within a port.
device and endpoint numbers must be unique within a port. If a device object
may only has a single port, then the number of that port shall be zero.
Similarly, if a port may only have a single endpoint, the number of that
endpoint shall be zero.
The endpoint reference uses property extension with "remote-endpoint" property
name followed by a reference in the same package. Such references consist of the