Even though the MT8188 SoC's Dual-Core SCP IP is practically the
same as the one found on MT8195, it doesn't have a dedicated L1
TCM and relies only on SRAM.

Set reg/reg-names minItems to 1 globally and override it in all of
the conditionals for the SoCs that require more, and then split
the mt8195/8188 conditionals to allow specifying only the cfg MMIO
on MT8188.

Fixes: 91e0d560b9fd ("dt-bindings: remoteproc: mediatek: Support MT8188 dual-core SCP")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---

Changes in v2:
 - Fix dtc warnings and validate again

  CHKDT   ./Documentation/devicetree/bindings
  LINT    ./Documentation/devicetree/bindings
  DTEX    Documentation/devicetree/bindings/remoteproc/mtk,scp.example.dts
  DTC [C] Documentation/devicetree/bindings/remoteproc/mtk,scp.example.dtb
Done.

 .../bindings/remoteproc/mtk,scp.yaml          | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml b/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml
index 179c98b33b4d..f0cae3e4bc78 100644
--- a/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml
+++ b/Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml
@@ -28,11 +28,11 @@ properties:
     description:
       Should contain the address ranges for memory regions SRAM, CFG, and,
       on some platforms, L1TCM.
-    minItems: 2
+    minItems: 1
     maxItems: 3
 
   reg-names:
-    minItems: 2
+    minItems: 1
     maxItems: 3
 
   clocks:
@@ -185,7 +185,7 @@ allOf:
     then:
       properties:
         reg:
-          maxItems: 3
+          minItems: 3
         reg-names:
           items:
             - const: sram
@@ -196,11 +196,22 @@ allOf:
         compatible:
           enum:
             - mediatek,mt8188-scp-dual
+    then:
+      properties:
+        reg:
+          maxItems: 1
+        reg-names:
+          items:
+            - const: cfg
+  - if:
+      properties:
+        compatible:
+          enum:
             - mediatek,mt8195-scp-dual
     then:
       properties:
         reg:
-          maxItems: 2
+          minItems: 2
         reg-names:
           items:
             - const: cfg
-- 
2.52.0

On Thu, Jan 15, 2026 at 12:16:45PM +0100, AngeloGioacchino Del Regno wrote:
>    reg-names:
> -    minItems: 2
> +    minItems: 1
>      maxItems: 3
>  
>    clocks:
> @@ -185,7 +185,7 @@ allOf:
>      then:
>        properties:
>          reg:
> -          maxItems: 3
> +          minItems: 3
>          reg-names:
>            items:
>              - const: sram

I think you also need to update the if:then: section with
mediatek,mt8183-scp+mediatek,mt8186-scp+mediatek,mt8188-scp

> @@ -196,11 +196,22 @@ allOf:
>          compatible:
>            enum:
>              - mediatek,mt8188-scp-dual
> +    then:
> +      properties:
> +        reg:
> +          maxItems: 1
> +        reg-names:
> +          items:
> +            - const: cfg
> +  - if:
> +      properties:
> +        compatible:
> +          enum:
>              - mediatek,mt8195-scp-dual
>      then:
>        properties:
>          reg:
> -          maxItems: 2
> +          minItems: 2

You still need maxItems here, otherwise you change the meaning to 2-3.

>          reg-names:
>            items:
>              - const: cfg
> -- 
> 2.52.0
>