diff options
| author | Sakari Ailus <sakari.ailus@linux.intel.com> | 2018-07-17 17:19:20 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2018-07-23 12:44:52 +0200 |
| commit | e49363e96fd2ee3fd5259fd2a6f9050cb4af82c8 (patch) | |
| tree | e24108ac4945726978f4e94081ce3673effd5f84 /Documentation | |
| parent | e58b1c6a9422b97b30838e77b7d1d2bbed121e96 (diff) | |
ACPI: property: graph: Improve graph documentation for port/ep numbering
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>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/acpi/dsd/graph.txt | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/acpi/dsd/graph.txt b/Documentation/acpi/dsd/graph.txt index 0b007fceda0e..3131f457882b 100644 --- a/Documentation/acpi/dsd/graph.txt +++ b/Documentation/acpi/dsd/graph.txt @@ -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 |