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authorChangbin Du <changbin.du@gmail.com>2019-04-25 01:52:57 +0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-04-25 23:07:20 +0200
commit05000042f33dd8b2afbeedc1d8fd499486d14b0d (patch)
treeb66fba5b24c34f14286ea341503e0790894e33d8 /Documentation/acpi
parentf2dde1ed0f2818405b371c2b65a98fece221b7a0 (diff)
Documentation: ACPI: move dsd/data-node-references.txt to firmware-guide/acpi and convert to reST
This converts the plain text documentation to reStructuredText format and adds it to Sphinx TOC tree. No essential content change. Signed-off-by: Changbin Du <changbin.du@gmail.com> Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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-Copyright (C) 2018 Intel Corporation
-Author: Sakari Ailus <sakari.ailus@linux.intel.com>
-
-
-Referencing hierarchical data nodes
------------------------------------
-
-ACPI in general allows referring to device objects in the tree only.
-Hierarchical data extension nodes may not be referred to directly, hence this
-document defines a scheme to implement such references.
-
-A reference consist of the device object name followed by one or more
-hierarchical data extension [1] keys. Specifically, the hierarchical data
-extension node which is referred to by the key shall lie directly under the
-parent object i.e. either the device object or another hierarchical data
-extension node.
-
-The keys in the hierarchical data nodes shall consist of the name of the node,
-"@" character and the number of the node in hexadecimal notation (without pre-
-or postfixes). The same ACPI object shall include the _DSD property extension
-with a property "reg" that shall have the same numerical value as the number of
-the node.
-
-In case a hierarchical data extensions node has no numerical value, then the
-"reg" property shall be omitted from the ACPI object's _DSD properties and the
-"@" character and the number shall be omitted from the hierarchical data
-extension key.
-
-
-Example
--------
-
- In the ASL snippet below, the "reference" _DSD property [2] contains a
- device object reference to DEV0 and under that device object, a
- hierarchical data extension key "node@1" referring to the NOD1 object
- and lastly, a hierarchical data extension key "anothernode" referring to
- the ANOD object which is also the final target node of the reference.
-
- Device (DEV0)
- {
- Name (_DSD, Package () {
- ToUUID("dbb8e3e6-5886-4ba6-8795-1319f52a966b"),
- Package () {
- Package () { "node@0", NOD0 },
- Package () { "node@1", NOD1 },
- }
- })
- Name (NOD0, Package() {
- ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
- Package () {
- Package () { "random-property", 3 },
- }
- })
- Name (NOD1, Package() {
- ToUUID("dbb8e3e6-5886-4ba6-8795-1319f52a966b"),
- Package () {
- Package () { "anothernode", ANOD },
- }
- })
- Name (ANOD, Package() {
- ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
- Package () {
- Package () { "random-property", 0 },
- }
- })
- }
-
- Device (DEV1)
- {
- Name (_DSD, Package () {
- ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
- Package () {
- Package () { "reference", ^DEV0, "node@1", "anothernode" },
- }
- })
- }
-
-Please also see a graph example in graph.txt .
-
-References
-----------
-
-[1] Hierarchical Data Extension UUID For _DSD.
- <URL:http://www.uefi.org/sites/default/files/resources/_DSD-hierarchical-data-extension-UUID-v1.1.pdf>,
- referenced 2018-07-17.
-
-[2] Device Properties UUID For _DSD.
- <URL:http://www.uefi.org/sites/default/files/resources/_DSD-device-properties-UUID.pdf>,
- referenced 2016-10-04.