[PATCH v3 1/1] dt-bindings: remoteproc: mtk,scp: Allow multiple memory regions for MT8188

[Arnab Layek]

The MT8188 SCP requires support for 1-2 reserved memory regions, while
other MediaTek SoCs use only a single memory region.

The schema uses a permissive base with restrictive conditionals:
1) Base schema allows all devices minItems: 1, maxItems: 2
2) Non-MT8188 devices (mt8183, mt8186, mt8192, mt8195, mt8195-dual) are
   restricted to maxItems: 1, overriding the base
3) MT8188 devices (mt8188, mt8188-dual) set minItems: 1 with item
   descriptions, inheriting maxItems: 2 from base, making the second
   L1TCM region optional

This follows the same pattern as other MediaTek dt-bindings such as
mediatek,jpeg-encoder.yaml which uses conditional schemas to support
different numbers of iommus per device variant.

Signed-off-by: Arnab Layek <arnab.layek at mediatek.com>
---
 .../bindings/remoteproc/mtk,scp.yaml          | 45 ++++++++++++++++++-
 1 file changed, 43 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml b/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml
index bdbb12118da4..fca9b0675eae 100644
--- a/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml
+++ b/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml
@@ -55,7 +55,8 @@ properties:
       initializing SCP.
 
   memory-region:
-    maxItems: 1
+    minItems: 1
+    maxItems: 2
 
   cros-ec-rpmsg:
     $ref: /schemas/embedded-controller/google,cros-ec.yaml
@@ -123,7 +124,8 @@ patternProperties:
           initializing sub cores of multi-core SCP.
 
       memory-region:
-        maxItems: 1
+        minItems: 1
+        maxItems: 2
 
       cros-ec-rpmsg:
         $ref: /schemas/embedded-controller/google,cros-ec.yaml
@@ -205,6 +207,45 @@ allOf:
           items:
             - const: cfg
             - const: l1tcm
+  - if:
+      properties:
+        compatible:
+          enum:
+            - mediatek,mt8183-scp
+            - mediatek,mt8186-scp
+            - mediatek,mt8192-scp
+            - mediatek,mt8195-scp
+            - mediatek,mt8195-scp-dual
+    then:
+      properties:
+        memory-region:
+          maxItems: 1
+      patternProperties:
+        "^scp@[a-f0-9]+$":
+          properties:
+            memory-region:
+              maxItems: 1
+  - if:
+      properties:
+        compatible:
+          enum:
+            - mediatek,mt8188-scp
+            - mediatek,mt8188-scp-dual
+    then:
+      properties:
+        memory-region:
+          minItems: 1
+          items:
+            - description: Main SCP SRAM memory region
+            - description: Optional SCP L1TCM memory region
+      patternProperties:
+        "^scp@[a-f0-9]+$":
+          properties:
+            memory-region:
+              minItems: 1
+              items:
+                - description: Main SCP SRAM memory region
+                - description: Optional SCP L1TCM memory region
 
 additionalProperties: false
 
-- 
2.45.2