diff --git a/docs/deployments/secure-partitions.rst b/docs/deployments/secure-partitions.rst
index 7727de9..a129996 100644
--- a/docs/deployments/secure-partitions.rst
+++ b/docs/deployments/secure-partitions.rst
@@ -113,6 +113,25 @@
     - * | Secure storage service instance (e.g. hosted by protected-storage SP)
       * | Crypto service instance (e.g. hosted crypto SP)
 
+ftpm
+----
+The fTPM deployment provides a software TPM 2.0 implementation in an SP, based
+on the `ms-tpm-20-ref` reference implementation. It exposes a TPM CRB interface
+over FF-A, conforming to the `Arm DEN0138` specification. For more information,
+see: :ref:`TPM 2.0 service`.
+
+.. list-table::
+  :widths: 1 2
+  :header-rows: 0
+
+  * - Supported Environments
+    - * *opteesp* (runs as an S-EL0 SP under OP-TEE)
+      * *sp* (SPMC agnostic S-EL0 SP format)
+  * - External Dependencies
+    - * | Secure storage service instance (e.g. hosted by protected-storage SP)
+      * | TRNG (platform specific)
+      * | Carveout for CRB memory regions
+
 env-test
 --------
 An instance of the test runner service provider is built into an SP image to
diff --git a/docs/services/image/tpm-components.svg b/docs/services/image/tpm-components.svg
new file mode 100644
index 0000000..1a0863b
--- /dev/null
+++ b/docs/services/image/tpm-components.svg
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/docs/services/index.rst b/docs/services/index.rst
index 15e2415..0d1d30c 100644
--- a/docs/services/index.rst
+++ b/docs/services/index.rst
@@ -12,6 +12,7 @@
     block-storage/block-storage-service-description
     uefi-smm-services
     logging-service-description
+    tpm-service-description
 
 --------------
 
diff --git a/docs/services/tpm-service-description.rst b/docs/services/tpm-service-description.rst
new file mode 100644
index 0000000..faa2010
--- /dev/null
+++ b/docs/services/tpm-service-description.rst
@@ -0,0 +1,92 @@
+TPM 2.0 service
+===============
+Overview
+--------
+A TPM is a Root of Trust component that is standardized by the Trusted Computing Group in the
+`TPM specification`_. The Trusted Services project implements the following TPM-related
+components:
+
+  * TPM Service CRB Interface Over FF-A (`DEN0138`_) RPC layer,
+  * TPM CRB provider,
+  * TPM backend using `ms-tpm-20-ref`_ library.
+
+These components are integrated as a Secure Partition in the fTPM deployment, which provides
+standard TPM 2.0 functionality to clients both in Normal World and Secure World. This service is
+suitable for platforms without discrete TPM hardware, while maintaining compatibility with software
+stacks expecting a standard TPM CRB interface.
+
+Communication with the fTPM follows the DEN0138 protocol, using shared memory for the CRB registers
+and FF-A direct messaging for signaling.
+
+.. image:: image/tpm-components.svg
+
+TPM CRB over FF-A RPC endpoint
+------------------------------
+Location: ``components/rpc/tpm_crb_ffa/endpoint/sp/tpm_crb_ffa_endpoint.c``
+
+This component handles the incoming FF-A direct requests and parses them according to the DEN0138
+specification. The functions defined by this specification fall into two categories:
+
+  * Management type functions, for controlling the TPM service frontend in the SP.
+  * Start function, to signal to the TPM backend that a locality request or command available in the
+    CRB should be processed.
+
+The management type functions are handled in this component, while the start function is passed to
+the TPM CRB provider.
+
+TPM CRB provider
+----------------
+Location: ``components/service/tpm/provider/tpm_crb_provider.c``
+
+This component provides the core logic for handling TPM CRB memory-mapped register access, it
+interprets CRB register state transitions. The two main types of events to handle are:
+
+  * Locality request: a client requests or relinquishes access to a locality.
+  * Command request: a client has placed a TPM command into a locality and requires processing of
+    the command.
+
+The locality requests are handled in this components, while the command request is passed to the
+TPM backend.
+
+TPM backend
+-----------
+Location: ``components/service/tpm/backend/ms_tpm/ms_tpm_backend.c``
+
+Currently a single type of TPM backend is supported, which is based on the ms-tpm-20-ref library.
+This is responsible for:
+
+  * Initial provisioning using ``TPM_Manufacture()``.
+  * Startup and runtime initialization of the TPM.
+  * Command execution: the memory buffer from the CRB which contains the incoming command is passed
+    to the library using ``ExecuteCommand()``, writing the response back to the same memory buffer.
+
+The platform, crypto library and build system related modifications for ms-tpm-20-ref are
+implemented in patch files found at ``external/ms_tpm/*.patch``. Summary of the modifications:
+
+  * CMake support: adds a simple CMake build system to the project which can compile the necessary
+    files into a static library an install it as a CMake package.
+  * Mbed TLS support: adds support for using hash, symmetric crypto and bignum operations from Mbed
+    TLS instead of OpenSSL.
+  * Platform porting: implements a minimal necessary platform layer to satisfy the requirements of
+    ms-tpm-20-ref. This includes:
+
+    * Non-volatile storage using PSA Storage API.
+    * Get entropy using Mbed TLS.
+
+Limitations
+-----------
+
+  * Handling of Locality 4 commands is not implemented.
+  * Hardware clock usage is not implemented, a software counter is used instead that's incremented
+    on each query.
+  * Handling of early boot measurements (from BL1 and BL2) is not implemented.
+
+--------------
+
+.. _`TPM specification`: https://trustedcomputinggroup.org/resource/tpm-library-specification/
+.. _`DEN0138`: https://developer.arm.com/documentation/den0138/latest
+.. _`ms-tpm-20-ref`: https://github.com/microsoft/ms-tpm-20-ref
+
+*Copyright (c) 2025, Arm Limited and Contributors. All rights reserved.*
+
+SPDX-License-Identifier: BSD-3-Clause