[PATCH v5 1/2] dt-bindings: PCI: amd-mdb: Add CPM6 support

[Sai Krishna Musham <sai.krishna.musham@amd.com>]

The AMD CPM6 PCIe controller is based on the Synopsys DesignWare PCIe
IP and integrates two PCIe host controller instances. Add the
"amd,versal2-cpm6-host" and "amd,versal2-cpm6-host1" compatible strings
to describe the HOST0 and HOST1 controller instances.

Add "intr" to the vendor-specific reg-names in snps,dw-pcie.yaml for
the per-controller interrupt register region used by CPM6.

Update amd,versal2-mdb-host.yaml with separate register definitions:
- MDB5: 4 regions (slcr, config, dbi, atu)
- CPM6: 5 regions (slcr, config, dbi, atu, intr)

Signed-off-by: Sai Krishna Musham <sai.krishna.musham@amd.com>
---
Changes in v5:
- Explain host vs host1 in the commit message.
- Drop redundant minItems for MDB5 (4 is already min).
- Drop redundant maxItems for CPM6 (5 is already max).

Changes in v4:
- None

Changes in v3:
- Update subject to match history.
- Move allOf to the end, after required block.
- Drop the CPM6 example.

Changes in v2:
- Update the CPM6 device tree binding and example.

v1 https://lore.kernel.org/all/20260402180006.486229-2-sai.krishna.musham@amd.com/
v2 https://lore.kernel.org/all/20260728202044.1785986-2-sai.krishna.musham@amd.com/
v3 https://lore.kernel.org/all/20260803144412.713639-2-sai.krishna.musham@amd.com/
v4 https://lore.kernel.org/all/20260808105256.3705889-2-sai.krishna.musham@amd.com/
---
 .../bindings/pci/amd,versal2-mdb-host.yaml    | 41 ++++++++++++++++---
 .../devicetree/bindings/pci/snps,dw-pcie.yaml |  2 +
 2 files changed, 38 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml b/Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml
index 406c15e1dee1..cd207b346313 100644
--- a/Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml
+++ b/Documentation/devicetree/bindings/pci/amd,versal2-mdb-host.yaml
@@ -9,27 +9,30 @@ title: AMD Versal2 MDB(Multimedia DMA Bridge) Host Controller
 maintainers:
   - Thippeswamy Havalige <thippeswamy.havalige@amd.com>
 
-allOf:
-  - $ref: /schemas/pci/pci-host-bridge.yaml#
-  - $ref: /schemas/pci/snps,dw-pcie.yaml#
-
 properties:
   compatible:
-    const: amd,versal2-mdb-host
+    enum:
+      - amd,versal2-mdb-host
+      - amd,versal2-cpm6-host
+      - amd,versal2-cpm6-host1
 
   reg:
+    minItems: 4
     items:
       - description: MDB System Level Control and Status Register (SLCR) Base
       - description: configuration region
       - description: data bus interface
       - description: address translation unit register
+      - description: CPM6 PCIe error and event interrupt registers
 
   reg-names:
+    minItems: 4
     items:
       - const: slcr
       - const: config
       - const: dbi
       - const: atu
+      - const: intr
 
   ranges:
     maxItems: 2
@@ -92,6 +95,34 @@ required:
   - "#interrupt-cells"
   - interrupt-controller
 
+allOf:
+  - $ref: /schemas/pci/pci-host-bridge.yaml#
+  - $ref: /schemas/pci/snps,dw-pcie.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: amd,versal2-mdb-host
+    then:
+      properties:
+        reg:
+          maxItems: 4
+        reg-names:
+          maxItems: 4
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - amd,versal2-cpm6-host
+              - amd,versal2-cpm6-host1
+    then:
+      properties:
+        reg:
+          minItems: 5
+        reg-names:
+          minItems: 5
+
 unevaluatedProperties: false
 
 examples:
diff --git a/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml b/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
index b3216141881c..21f86609ddb6 100644
--- a/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/snps,dw-pcie.yaml
@@ -117,6 +117,8 @@ properties:
               enum: [ ecam ]
             - description: AMD MDB PCIe SLCR region
               const: slcr
+            - description: AMD CPM6 PCIe error and event interrupt registers
+              const: intr
     allOf:
       - contains:
           enum: [ dbi, ctrl ]
-- 
2.44.4