diff --git a/MdePkg/Include/IndustryStandard/TpmPtp.h b/MdePkg/Include/IndustryStandard/TpmPtp.h
index 43c5757bcc..182ad1b780 100644
--- a/MdePkg/Include/IndustryStandard/TpmPtp.h
+++ b/MdePkg/Include/IndustryStandard/TpmPtp.h
@@ -5,6 +5,10 @@
 Copyright (c) 2016 - 2018, Intel Corporation. All rights reserved.<BR>
 SPDX-License-Identifier: BSD-2-Clause-Patent
 
+  @par Reference(s)
+    - TCG PC Client Platform TPM Profile (PTP) Specification
+      (https://trustedcomputinggroup.org/resource/pc-client-platform-tpm-profile-ptp-specification/)
+
 **/
 
 #ifndef _TPM_PTP_H_
@@ -363,6 +367,36 @@ typedef union {
 #define PTP_INTERFACE_IDENTIFIER_INTERFACE_SELECTOR_FIFO  0x0
 #define PTP_INTERFACE_IDENTIFIER_INTERFACE_SELECTOR_CRB   0x1
 
+///
+/// CapLocality
+/// ref Table 19, 20 in TCG PC Client Platform TPM Profile (PTP) Specification
+///
+#define PTP_CAP_LOCALITY_ZERO_ONLY  0x0
+#define PTP_CAP_LOCALITY_FIVE       0x1
+
+///
+/// CapCRB
+/// ref Table 19, 20 in TCG PC Client Platform TPM Profile (PTP) Specification
+///
+#define PTP_CAP_CRB_INTEREFACE_NOT_SUPPORTED  0x0
+#define PTP_CAP_CRB_INTEREFACE_SUPPORTED      0x1
+
+///
+/// CapFIFO
+/// ref Table 20 in TCG PC Client Platform TPM Profile (PTP) Specification
+///
+#define PTP_CAP_FIFO_INTERFACE_NOT_SUPPORTED  0x0
+#define PTP_CAP_FIFO_INTERFACE_SUPPORTED      0x1
+
+///
+/// CapDataXferSizeSupport
+/// ref Table 20 in TCG PC Client Platform TPM Profile (PTP) Specification
+///
+#define PTP_CAP_DATA_XFER_SIZE_4_BYTES   0x0
+#define PTP_CAP_DATA_XFER_SIZE_8_BYTES   0x1
+#define PTP_CAP_DATA_XFER_SIZE_32_BYTES  0x2
+#define PTP_CAP_DATA_XFER_SIZE_64_BYTES  0x3
+
 //
 // Define bits of Locality State Register
 //