The Renesas RZ/T2H (R9A09G077) and RZ/N2H (R9A09G087) SoCs have three
DMAC instances. Compared to the previously supported RZ/V2H, these SoCs
are missing the error interrupt line and the reset lines, and they use
a different ICU IP.

Document them, and use RZ/T2H as a fallback for RZ/N2H as the DMACs are
entirely compatible.

Signed-off-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@renesas.com>
---

V2:
 * remove notes

 .../bindings/dma/renesas,rz-dmac.yaml         | 100 ++++++++++++++----
 1 file changed, 82 insertions(+), 18 deletions(-)

diff --git a/Documentation/devicetree/bindings/dma/renesas,rz-dmac.yaml b/Documentation/devicetree/bindings/dma/renesas,rz-dmac.yaml
index f891cfcc48c7..f7bcdb4a29ca 100644
--- a/Documentation/devicetree/bindings/dma/renesas,rz-dmac.yaml
+++ b/Documentation/devicetree/bindings/dma/renesas,rz-dmac.yaml
@@ -28,6 +28,13 @@ properties:
 
       - const: renesas,r9a09g057-dmac # RZ/V2H(P)
 
+      - const: renesas,r9a09g077-dmac # RZ/T2H
+
+      - items:
+          - enum:
+              - renesas,r9a09g087-dmac # RZ/N2H
+          - const: renesas,r9a09g077-dmac
+
   reg:
     items:
       - description: Control and channel register block
@@ -35,27 +42,12 @@ properties:
     minItems: 1
 
   interrupts:
+    minItems: 16
     maxItems: 17
 
   interrupt-names:
-    items:
-      - const: error
-      - const: ch0
-      - const: ch1
-      - const: ch2
-      - const: ch3
-      - const: ch4
-      - const: ch5
-      - const: ch6
-      - const: ch7
-      - const: ch8
-      - const: ch9
-      - const: ch10
-      - const: ch11
-      - const: ch12
-      - const: ch13
-      - const: ch14
-      - const: ch15
+    minItems: 16
+    maxItems: 17
 
   clocks:
     items:
@@ -121,6 +113,35 @@ required:
 allOf:
   - $ref: dma-controller.yaml#
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - renesas,rz-dmac
+              - renesas,r9a09g057-dmac
+    then:
+      properties:
+        interrupt-names:
+          items:
+            - const: error
+            - const: ch0
+            - const: ch1
+            - const: ch2
+            - const: ch3
+            - const: ch4
+            - const: ch5
+            - const: ch6
+            - const: ch7
+            - const: ch8
+            - const: ch9
+            - const: ch10
+            - const: ch11
+            - const: ch12
+            - const: ch13
+            - const: ch14
+            - const: ch15
+
   - if:
       properties:
         compatible:
@@ -188,6 +209,49 @@ allOf:
         - renesas,icu
         - resets
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: renesas,r9a09g077-dmac
+    then:
+      properties:
+        reg:
+          maxItems: 1
+        clocks:
+          maxItems: 1
+
+        clock-names: false
+        resets: false
+        reset-names: false
+
+        interrupts:
+          maxItems: 16
+
+        interrupt-names:
+          items:
+            - const: ch0
+            - const: ch1
+            - const: ch2
+            - const: ch3
+            - const: ch4
+            - const: ch5
+            - const: ch6
+            - const: ch7
+            - const: ch8
+            - const: ch9
+            - const: ch10
+            - const: ch11
+            - const: ch12
+            - const: ch13
+            - const: ch14
+            - const: ch15
+
+      required:
+        - clocks
+        - power-domains
+        - renesas,icu
+
 additionalProperties: false
 
 examples:
-- 
2.52.0