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| -rw-r--r-- | Documentation/acpi/dsd/graph.txt | 28 |
1 files changed, 16 insertions, 12 deletions
diff --git a/Documentation/acpi/dsd/graph.txt b/Documentation/acpi/dsd/graph.txt index 591c47509c63..0b007fceda0e 100644 --- a/Documentation/acpi/dsd/graph.txt +++ b/Documentation/acpi/dsd/graph.txt @@ -36,20 +36,24 @@ The port and endpoint concepts are very similar to those in Devicetree [3]. A port represents an interface in a device, and an endpoint represents a connection to that interface. -All port nodes are located under the device's "_DSD" node in the -hierarchical data extension tree. The property extension related to -each port node must contain the key "port" and an integer value which -is the number of the port. The object it refers to should be called "PRTX", -where "X" is the number of the port. - -Further on, endpoints are located under the individual port nodes. The -first hierarchical data extension package list entry of the endpoint -nodes must begin with "endpoint" and must be followed by the number -of the endpoint. The object it refers to should be called "EPXY", where -"X" is the number of the port and "Y" is the number of the endpoint. +All port nodes are located under the device's "_DSD" node in the hierarchical +data extension tree. The data extension related to each port node must begin +with "port" and must be followed by the number of the port as its key. The +target object it refers to should be called "PRTX", where "X" is the number of +the port. An example of such a package would be: + + Package() { "port4", PRT4 } + +Further on, endpoints are located under the port nodes. The hierarchical data +extension key of the endpoint nodes must begin with "endpoint" and must be +followed by the number of the endpoint. The object it refers to should be called +"EPXY", where "X" is the number of the port and "Y" is the number of the +endpoint. An example of such a package would be: + + Package() { "endpoint0", EP40 } Each port node contains a property extension key "port", the value of -which is the number of the port node. The each endpoint is similarly numbered +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. |