diff --git a/MdePkg/Include/Protocol/SpiConfiguration.h b/MdePkg/Include/Protocol/SpiConfiguration.h
index 3f8fb9ff62..120b54bbad 100644
--- a/MdePkg/Include/Protocol/SpiConfiguration.h
+++ b/MdePkg/Include/Protocol/SpiConfiguration.h
@@ -2,10 +2,11 @@
   This file defines the SPI Configuration Protocol.
 
   Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
+  Copyright (C) 2024 Advanced Micro Devices, Inc. All rights reserved.
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
   @par Revision Reference:
-    This Protocol was introduced in UEFI PI Specification 1.6.
+    This Protocol was introduced in UEFI PI Specification 1.8 A.
 
 **/
 
@@ -168,6 +169,13 @@ typedef struct _EFI_SPI_BUS {
   VOID    *ClockParameter;
 } EFI_SPI_BUS;
 
+///
+/// Definitions of SPI Part Attributes.
+///
+#define SPI_PART_SUPPORTS_2_BIT_DATA_BUS_WIDTH  BIT0
+#define SPI_PART_SUPPORTS_4_B1T_DATA_BUS_WIDTH  BIT1
+#define SPI_PART_SUPPORTS_8_B1T_DATA_BUS_WIDTH  BIT2
+
 ///
 /// The EFI_SPI_PERIPHERAL data structure describes how a specific block of
 /// logic which is connected to the SPI bus. This data structure also selects
diff --git a/MdePkg/Include/Protocol/SpiHc.h b/MdePkg/Include/Protocol/SpiHc.h
index 30128dd5c4..354de72160 100644
--- a/MdePkg/Include/Protocol/SpiHc.h
+++ b/MdePkg/Include/Protocol/SpiHc.h
@@ -2,10 +2,11 @@
   This file defines the SPI Host Controller Protocol.
 
   Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
+  Copyright (C) 2024 Advanced Micro Devices, Inc. All rights reserved.
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
   @par Revision Reference:
-    This Protocol was introduced in UEFI PI Specification 1.6.
+    This Protocol was introduced in UEFI PI Specification 1.8 A.
 
 **/
 
@@ -121,6 +122,19 @@ typedef EFI_STATUS
   IN EFI_SPI_BUS_TRANSACTION    *BusTransaction
   );
 
+///
+/// Definitions of SPI Host Controller Attributes.
+///
+#define HC_SUPPORTS_WRITE_ONLY_OPERATIONS       BIT0
+#define HC_SUPPORTS_READ_ONLY_OPERATIONS        BIT1
+#define HC_SUPPORTS_WRITE_THEN_READ_OPERATIONS  BIT2
+#define HC_TX_FRAME_IN_MOST_SIGNIFICANT_BITS    BIT3
+#define HC_RX_FRAME_IN_MOST_SIGNIFICANT_BITS    BIT4
+#define HC_SUPPORTS_2_BIT_DATA_BUS_WIDTH        BIT5
+#define HC_SUPPORTS_4_BIT_DATA_BUS_WIDTH        BIT6
+#define HC_SUPPORTS_8_BIT_DATA_BUS_WIDTH        BIT7
+#define HC_TRANSFER_SIZE_INCLUDES_OPCODE        BIT8
+#define HC_TRANSFER_SIZE_INCLUDES_ADDRESS       BIT9
 ///
 /// Support a SPI data transaction between the SPI controller and a SPI chip.
 ///
diff --git a/MdePkg/Include/Protocol/SpiIo.h b/MdePkg/Include/Protocol/SpiIo.h
index b4fc5e03b8..2c95a375a2 100644
--- a/MdePkg/Include/Protocol/SpiIo.h
+++ b/MdePkg/Include/Protocol/SpiIo.h
@@ -2,10 +2,11 @@
   This file defines the SPI I/O Protocol.
 
   Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
+  Copyright (C) 2024 Advanced Micro Devices, Inc. All rights reserved.
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
   @par Revision Reference:
-    This Protocol was introduced in UEFI PI Specification 1.6.
+    This Protocol was introduced in UEFI PI Specification 1.8 A.
 
 **/
 
@@ -223,6 +224,15 @@ typedef struct _EFI_SPI_BUS_TRANSACTION {
   UINT8                       *ReadBuffer;
 } EFI_SPI_BUS_TRANSACTION;
 
+///
+/// Definitions of SPI I/O Attributes.
+///
+#define SPI_IO_SUPPORTS_2_BIT_DATA_BUS_WIDTH   BIT0
+#define SPI_IO_SUPPORTS_4_BIT_DATA_BUS_WIDTH   BIT1
+#define SPI_IO_SUPPORTS_8_BIT_DATA_BUS_WIDTH   BIT2
+#define SPI_IO_TRANSFER_SIZE_INCLUDES_OPCODE   BIT3
+#define SPI_IO_TRANSFER_SIZE_INCLUDES_ADDRESS  BIT4
+
 ///
 /// Support managed SPI data transactions between the SPI controller and a SPI
 /// chip.