diff options
Diffstat (limited to 'Documentation/acpi/enumeration.txt')
| -rw-r--r-- | Documentation/acpi/enumeration.txt | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/acpi/enumeration.txt b/Documentation/acpi/enumeration.txt index a91ec5af52df..209a5eba6b87 100644 --- a/Documentation/acpi/enumeration.txt +++ b/Documentation/acpi/enumeration.txt @@ -415,3 +415,12 @@ the "compatible" property in the _DSD or a _CID as long as one of their ancestors provides a _DSD with a valid "compatible" property. Such device objects are then simply regarded as additional "blocks" providing hierarchical configuration information to the driver of the composite ancestor device. + +However, PRP0001 can only be returned from either _HID or _CID of a device +object if all of the properties returned by the _DSD associated with it (either +the _DSD of the device object itself or the _DSD of its ancestor in the +"composite device" case described above) can be used in the ACPI environment. +Otherwise, the _DSD itself is regarded as invalid and therefore the "compatible" +property returned by it is meaningless. + +Refer to DSD-properties-rules.txt for more information. |