[PATCH v2 1/5] dt-bindings: dma: ti: k3-bcdma: Add bindings for BCDMA CSI RX

[Vignesh Raghavendra]

AM62A SoC has a dedicated BCDMA that serves Camera Serial Interface
(CSI) IP. Add new compatible for the same. Unlike system
BCDMA, this instance only has RX DMA channels and lack TX or block copy
channel. Thus make those properties optional. Additionally CSI RX has
independent power domain, add the binding for the same.

Signed-off-by: Vignesh Raghavendra <vigneshr@xxxxxx>
---

v2:
reorder compatibles alphabetically
Fix reg defintion to min 3 and max 5
Keep top level constraints as is  and further restrict
variants within "if-else" blocks

 .../devicetree/bindings/dma/ti/k3-bcdma.yaml  | 67 ++++++++++++++-----
 1 file changed, 49 insertions(+), 18 deletions(-)

diff --git a/Documentation/devicetree/bindings/dma/ti/k3-bcdma.yaml b/Documentation/devicetree/bindings/dma/ti/k3-bcdma.yaml
index 08627d91e607..86e8bebce3f2 100644
--- a/Documentation/devicetree/bindings/dma/ti/k3-bcdma.yaml
+++ b/Documentation/devicetree/bindings/dma/ti/k3-bcdma.yaml
@@ -28,13 +28,15 @@ description: |
   PDMAs can be configured via BCDMA split channel's peer registers to match with
   the configuration of the legacy peripheral.
 
-allOf:
-  - $ref: /schemas/dma/dma-controller.yaml#
-  - $ref: /schemas/arm/keystone/ti,k3-sci-common.yaml#
-
 properties:
   compatible:
-    const: ti,am64-dmss-bcdma
+    enum:
+      - ti,am62a-dmss-bcdma-csirx
+      - ti,am64-dmss-bcdma
+
+  reg:
+    minItems: 3
+    maxItems: 5
 
   "#dma-cells":
     const: 3
@@ -65,19 +67,13 @@ properties:
 
       cell 3: ASEL value for the channel
 
-  reg:
-    maxItems: 5
-
-  reg-names:
-    items:
-      - const: gcfg
-      - const: bchanrt
-      - const: rchanrt
-      - const: tchanrt
-      - const: ringrt
-
   msi-parent: true
 
+  power-domains:
+    description:
+      Power domain if available
+    maxItems: 1
+
   ti,asel:
     $ref: /schemas/types.yaml#/definitions/uint32
     description: ASEL value for non slave channels
@@ -123,10 +119,45 @@ required:
   - msi-parent
   - ti,sci
   - ti,sci-dev-id
-  - ti,sci-rm-range-bchan
-  - ti,sci-rm-range-tchan
   - ti,sci-rm-range-rchan
 
+allOf:
+  - $ref: /schemas/dma/dma-controller.yaml#
+  - $ref: /schemas/arm/keystone/ti,k3-sci-common.yaml#
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: ti,am62a-dmss-bcdma-csirx
+    then:
+      properties:
+        ti,sci-rm-range-bchan: false
+        ti,sci-rm-range-tchan: false
+
+        reg-names:
+          items:
+            - const: gcfg
+            - const: rchanrt
+            - const: ringrt
+
+      required:
+        - power-domains
+
+    else:
+      properties:
+        reg-names:
+          items:
+            - const: gcfg
+            - const: bchanrt
+            - const: rchanrt
+            - const: tchanrt
+            - const: ringrt
+
+      required:
+        - ti,sci-rm-range-bchan
+        - ti,sci-rm-range-tchan
+
 unevaluatedProperties: false
 
 examples:
-- 
2.38.1