[PATCH 1/7] dt-bindings: interrupt-controller: realtek,rtl-intc: Allow 2 interrupt cells

[Markus Stockhausen]

The Realtek Otto SoC interrupt controller supports hardware interrupt
routing to multiple parent CPU interrupt lines. To utilize this
multi-domain support, peripheral devices need a way to explicitly
specify their desired parent interrupt line in the device tree.

Update the "#interrupt-cells" property to accept either 1 or 2 cells.
- 1 cell: Specifies the hardware interrupt index, implicitly routing it
  to the first available parent (maintaining backward compatibility).
- 2 cells: The first cell specifies the hardware interrupt index and
  the second cell specifies the targeted parent interrupt index.

Signed-off-by: Markus Stockhausen <markus.stockhausen@xxxxxx>
---
 .../bindings/interrupt-controller/realtek,rtl-intc.yaml      | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/interrupt-controller/realtek,rtl-intc.yaml b/Documentation/devicetree/bindings/interrupt-controller/realtek,rtl-intc.yaml
index 833a01cdd1b1..5c52e57c6647 100644
--- a/Documentation/devicetree/bindings/interrupt-controller/realtek,rtl-intc.yaml
+++ b/Documentation/devicetree/bindings/interrupt-controller/realtek,rtl-intc.yaml
@@ -32,8 +32,9 @@ properties:
 
   "#interrupt-cells":
     description:
-      SoC interrupt line index.
-    const: 1
+      First cell is the SoC interrupt line index. Optional second cell
+      specifies the parent interrupt index to route to.
+    enum: [1, 2]
 
   reg:
     minItems: 1
-- 
2.54.0