diff --git a/Documentation/driver-api/cxl/index.rst b/Documentation/driver-api/cxl/index.rst
index 036e49553542..12b82725d322 100644
--- a/Documentation/driver-api/cxl/index.rst
+++ b/Documentation/driver-api/cxl/index.rst
@@ -9,4 +9,6 @@ Compute Express Link
 
    memory-devices
 
+   maturity-map
+
 .. only::  subproject and html
diff --git a/Documentation/driver-api/cxl/maturity-map.rst b/Documentation/driver-api/cxl/maturity-map.rst
new file mode 100644
index 000000000000..9c5bff6484dd
--- /dev/null
+++ b/Documentation/driver-api/cxl/maturity-map.rst
@@ -0,0 +1,173 @@
+.. SPDX-License-Identifier: GPL-2.0
+.. include:: <isonum.txt>
+
+===========================================
+Compute Express Link Subsystem Maturity Map
+===========================================
+
+The Linux CXL subsystem tracks the dynamic `CXL specification
+<https://computeexpresslink.org/cxl-specification-landing-page>`_ that
+continues to respond to new use cases with new features, capability
+updates and fixes. At any given point some aspects of the subsystem are
+more mature than others. While the periodic pull requests summarize the
+`work being incorporated each merge window
+<https://lore.kernel.org/linux-cxl/?q=s%3APULL+s%3ACXL+tc%3Atorvalds+NOT+s%3ARe>`_,
+those do not always convey progress relative to a starting point and a
+future end goal.
+
+What follows is a coarse breakdown of the subsystem's major
+responsibilities along with a maturity score. The expectation is that
+the change-history of this document provides an overview summary of the
+subsystem maturation over time.
+
+The maturity scores are:
+
+- [3] Mature: Work in this area is complete and no changes on the horizon.
+  Note that this score can regress from one kernel release to the next
+  based on new test results or end user reports.
+
+- [2] Stabilizing: Major functionality operational, common cases are
+  mature, but known corner cases are still a work in progress.
+
+- [1] Initial: Capability that has exited the Proof of Concept phase, but
+  may still have significant gaps to close and fixes to apply as real
+  world testing occurs.
+
+- [0] Known gap: Feature is on a medium to long term horizon to
+  implement.  If the specification has a feature that does even have a '0'
+  score in this document, there is a good chance that no one in the
+  linux-cxl@vger.kernel.org community has started to look at it.
+
+- X: Out of scope for kernel enabling, or kernel enabling not required
+
+Feature and Capabilities
+========================
+
+Enumeration / Provisioning
+--------------------------
+All of the fundamental enumeration an object model of the subsystem is
+in place, but there are several corner cases that are pending closure.
+
+
+* [2] CXL Window Enumeration
+
+  * [0] :ref:`Extended-linear memory-side cache <extended-linear>`
+  * [0] Low Memory-hole
+  * [0] Hetero-interleave
+
+* [2] Switch Enumeration
+
+  * [0] CXL register enumeration link-up dependency
+
+* [2] HDM Decoder Configuration
+
+  * [0] Decoder target and granularity constraints
+
+2 Performance enumeration
+
+  * [3] Endpoint CDAT
+  * [3] Switch CDAT
+  * [1] CDAT to Core-mm integration
+  * [1] Shared link
+
+* [2] Hotplug
+  (see CXL Window Enumeration)
+
+  * [0] Handle Soft Reserved conflicts
+
+* [0] :ref:`RCH link status <rch-link-status>`
+
+RAS
+---
+In many ways CXL can be seen as a standardization of what would normally
+be handled by custom EDAC drivers. The open development here is
+mainly caused by the enumeration corner cases above.
+
+* [3] Component events (OS)
+* [2] Component events (FFM)
+* [1] Endpoint protocol errors (OS)
+* [1] Endpoint protocol errors (FFM)
+* [0] Switch protocol errors (OS)
+* [1] Switch protocol errors (FFM)
+* [2] DPA->HPA Address translation
+
+    * [1] XOR Interleave translation
+      (see CXL Window Enumeration)
+
+* [1] Memory Failure coordination
+* [0] Scrub control
+* [2] ACPI error injection EINJ
+
+  * [0] EINJ v2
+  * [X] Compliance DOE
+
+* [2] Native error injection
+* [3] RCH error handling
+* [1] VH error handling
+
+Mailbox commands
+----------------
+
+* [3] Firmware update
+* [3] Health / Alerts
+* [1] :ref:`Background commands <background-commands>`
+* [3] Santization
+* [3] Security commands
+* [3] RAW Command Debug Passthrough
+* [0] CEL-only-validtion Passthrough
+* [0] Switch CCI
+* [3] Timestamp
+* [1] PMU
+* [1] PMEM labels
+* [0] PMEM GPF / Dirty Shutdown
+
+Security
+--------
+
+* [X] CXL Trusted Execution Environment Security Protocol (TSP)
+* [X] CXL IDE (subsumed by TSP)
+
+Multi-host memory
+-----------------
+
+* [0] Dynamic Capacity Device Support
+* [0] Sharing
+
+Accelerator
+-----------
+
+* [0] Accelerator memory enumeration HDM-D (CXL 1.1/2.0 Type-2)
+* [0] Accelerator memory enumeration HDM-DB (CXL 3.0 Type-2)
+* [0] CXL.cache 68b (CXL 2.0)
+* [0] CXL.cache 256b Cache IDs (CXL 3.0)
+
+User Flow Support
+-----------------
+
+* [0] HPA->DPA Address translation (need xormaps export solution)
+
+Details
+=======
+
+.. _extended-linear:
+
+* **Extended-linear memory-side cache**: An HMAT proposal to enumerate the presence of a
+  memory-side cache where the cache capacity extends the SRAT address
+  range capacity. `See the ECN
+  <https://lore.kernel.org/linux-cxl/6650e4f835a0e_195e294a8@dwillia2-mobl3.amr.corp.intel.com.notmuch/>`_
+  for more details:
+
+.. _rch-link-status:
+
+* **RCH Link Status**: RCH (Restricted CXL Host) topologies, end up
+  hiding some standard registers like PCIe Link Status / Capabilities in
+  the CXL RCRB (Root Complex Register Block).
+
+.. _background-commands:
+
+* **Background commands**: The CXL background command mechanism is
+  awkward as the single slot is monopolized potentially indefinitely by
+  various commands. A `cancel on conflict
+  <http://lore.kernel.org/r/66035c2e8ba17_770232948b@dwillia2-xfh.jf.intel.com.notmuch>`_
+  facility is needed to make sure the kernel can ensure forward progress
+  of priority commands.
diff --git a/MAINTAINERS b/MAINTAINERS
index e533476081ba..d092b2ae5f25 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5331,6 +5331,7 @@ M:	Ira Weiny <ira.weiny@intel.com>
 M:	Dan Williams <dan.j.williams@intel.com>
 L:	linux-cxl@vger.kernel.org
 S:	Maintained
+F:	Documentation/driver-api/cxl
 F:	drivers/cxl/
 F:	include/linux/einj-cxl.h
 F:	include/linux/cxl-event.h
