The ACPI specification, version 6.3, January 2019,
defines the Named Object Encoding for ExternalOp
in section '20.2.5.2 Named Objects Encoding'.
This patch adds the definition for ExternalOp to
the list of Primary Opcode definitions.
Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>