dt-bindings: remoteproc: mediatek: Make l1tcm reg exclusive to mt819x

Commit ca23ecfd ("remoteproc/mediatek: support L1TCM") added support
for the l1tcm memory region on the MT8192 SCP, adding a new da_to_va
callback that handles l1tcm while keeping the old one for
back-compatibility with MT8183. However, since the mt8192 compatible was
missing from the dt-binding, the accompanying dt-binding commit
503c64cc ("dt-bindings: remoteproc: mediatek: add L1TCM memory region")
mistakenly added this reg as if it were for mt8183. And later
it became common to all platforms as their compatibles were added.

Fix the dt-binding so that the l1tcm reg can be present only on the
supported platforms: mt8192 and mt8195.

Fixes: 503c64cc ("dt-bindings: remoteproc: mediatek: add L1TCM memory region")
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220511195452.871897-2-nfraprado@collabora.comSigned-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

Documentation/devicetree/bindings/remoteproc/mtk,scp.yaml

@@ -23,11 +23,13 @@ properties:
 
   reg:
     description:
-      Should contain the address ranges for memory regions SRAM, CFG, and
-      L1TCM.
+      Should contain the address ranges for memory regions SRAM, CFG, and,
+      on some platforms, L1TCM.
+    minItems: 2
     maxItems: 3
 
   reg-names:
+    minItems: 2
     items:
       - const: sram
       - const: cfg
@@ -57,17 +59,31 @@ required:
   - reg
   - reg-names
 
-if:
+allOf:
+  - if:
       properties:
         compatible:
           enum:
             - mediatek,mt8183-scp
             - mediatek,mt8192-scp
-then:
+    then:
       required:
         - clocks
         - clock-names
 
+  - if:
+      properties:
+        compatible:
+          enum:
+            - mediatek,mt8183-scp
+            - mediatek,mt8186-scp
+    then:
+      properties:
+        reg:
+          maxItems: 2
+        reg-names:
+          maxItems: 2
+
 additionalProperties:
   type: object
   description:
@@ -86,10 +102,10 @@ additionalProperties:
 
 examples:
   - |
-    #include <dt-bindings/clock/mt8183-clk.h>
+    #include <dt-bindings/clock/mt8192-clk.h>
 
     scp@10500000 {
-        compatible = "mediatek,mt8183-scp";
+        compatible = "mediatek,mt8192-scp";
         reg = <0x10500000 0x80000>,
               <0x10700000 0x8000>,
               <0x10720000 0xe0000>;