[PATCH v2 1/8] ACPI: CPPC: Prepare cpc_register_resource for Package-type entries

CPPC v4 (ACPI 6.6, Section 8.4.6.1.2.7) introduces the Resource
Priority entry, which is a Package of sub-packages rather than a
plain Integer or Buffer register.  The existing cpc_register_resource
union only accommodates Integer and Buffer (register descriptor)
fields.

Add a Package variant to the cpc_entry union so that nested
structures such as RESOURCE_PRIORITY can store their element count
and a dynamically allocated array of child cpc_register_resource
descriptors.

No functional change intended; the new Package fields are not yet
consumed by any caller.

Signed-off-by: Lifeng Zheng <[email protected]>
---
 include/acpi/cppc_acpi.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/acpi/cppc_acpi.h b/include/acpi/cppc_acpi.h
index 8693890a7275..1839582b80be 100644
--- a/include/acpi/cppc_acpi.h
+++ b/include/acpi/cppc_acpi.h
@@ -71,6 +71,14 @@ struct cpc_register_resource {
 	union {
 		struct cpc_reg reg;
 		u64 int_value;
+		/*
+		 * CPPC v4: nested Package (e.g. RESOURCE_PRIORITY),
+		 * elements dynamically allocated
+		 */
+		struct {
+			u32 count;
+			struct cpc_register_resource *elements;
+		} package;
 	} cpc_entry;
 };
 
-- 
2.33.0