[PATCH v2 1/7] acpi/cppc: Add macro for CPPC register BUFFER only check

[Natarajan, Janakarajan]

CPC_SUP_BUFFER_ONLY ensures that an expected BUFFER only register has a
register type of ACPI_TYPE_BUFFER and is not NULL.

Signed-off-by: Janakarajan Natarajan <Janakarajan.Natarajan@xxxxxxx>
---
 drivers/acpi/cppc_acpi.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index d4244e7d0e38..56a09e057c4f 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -115,6 +115,14 @@ static DEFINE_PER_CPU(struct cpc_desc *, cpc_desc_ptr);
 #define CPC_SUPPORTED(cpc) ((cpc)->type == ACPI_TYPE_INTEGER ?		\
 				!!(cpc)->cpc_entry.int_value :		\
 				!IS_NULL_REG(&(cpc)->cpc_entry.reg))
+
+/*
+ * Evaluates to True if an optional cpc field is supported and is
+ * BUFFER only
+ */
+#define CPC_SUP_BUFFER_ONLY(cpc) ((cpc)->type == ACPI_TYPE_BUFFER &&	\
+				  !IS_NULL_REG(&(cpc)->cpc_entry.reg))
+
 /*
  * Arbitrary Retries in case the remote processor is slow to respond
  * to PCC commands. Keeping it high enough to cover emulators where
-- 
2.17.1