[PATCH v2 1/3] dt-bindings: i3c: xlnx: Add IBI and hot-join capability properties

In-Band Interrupt and Hot-Join are synthesis-time options of the AXI I3C
IP. Describe them with two boolean properties.

A Hot-Join request is acknowledged by the IBI machinery, so a hot-join
capable design is always IBI capable as well. Both events are reported
through the controller interrupt, which is therefore required whenever
the capability is present.

Signed-off-by: Shubham Patil <[email protected]>
---
Changes in V2:
- Rename the properties to "xlnx,in-band-interrupt-capable" and
  "xlnx,hot-join-capable", and expand their descriptions.
- Express the interrupt requirement with dependencies: instead of an
  allOf/if-then clause.
---
 .../bindings/i3c/xlnx,axi-i3c-1.0.yaml        | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/Documentation/devicetree/bindings/i3c/xlnx,axi-i3c-1.0.yaml b/Documentation/devicetree/bindings/i3c/xlnx,axi-i3c-1.0.yaml
index 2caa245a8656..a04becc07374 100644
--- a/Documentation/devicetree/bindings/i3c/xlnx,axi-i3c-1.0.yaml
+++ b/Documentation/devicetree/bindings/i3c/xlnx,axi-i3c-1.0.yaml
@@ -32,11 +32,33 @@ properties:
   interrupts:
     maxItems: 1
 
+  xlnx,in-band-interrupt-capable:
+    type: boolean
+    description:
+      The IP is synthesized with In-Band Interrupt support. An In-Band
+      Interrupt lets a target signal the controller over the SDA and SCL
+      pair instead of a dedicated side-band interrupt line, by driving its
+      own dynamic address during bus arbitration. Such requests are
+      reported through the controller interrupt.
+
+  xlnx,hot-join-capable:
+    type: boolean
+    description:
+      The IP is synthesized with Hot-Join support. Hot-Join lets a target
+      attached or powered up after the bus is already running announce
+      itself using the reserved Hot-Join address, so that the controller
+      can assign it a dynamic address. The request is acknowledged by the
+      same machinery as an In-Band Interrupt.
+
 required:
   - compatible
   - reg
   - clocks
 
+dependencies:
+  xlnx,hot-join-capable: ["xlnx,in-band-interrupt-capable"]
+  xlnx,in-band-interrupt-capable: [interrupts]
+
 allOf:
   - $ref: i3c.yaml#
 
@@ -54,5 +76,7 @@ examples:
         interrupts = <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>;
         #address-cells = <3>;
         #size-cells = <0>;
+        xlnx,in-band-interrupt-capable;
+        xlnx,hot-join-capable;
     };
 ...
-- 
2.34.1