[PATCH v2 5/6] dt-bindings: remoteproc: Add RPMsg resources to AMD BRAM rproc

[Ben Levinsky <ben.levinsky@amd.com>]

Describe the optional mailbox channels and named reserved-memory
regions used for RPMsg communication with a BRAM-based MicroBlaze
remote processor.

The three named memory regions provide the two virtio vrings and the
shared RPMsg buffer pool. Firmware and its loaded resource table remain
in the executable BRAM described by reg.

Assisted-by: Claude:claude-opus-5.5
Signed-off-by: Ben Levinsky <ben.levinsky@amd.com>
---
 .../bindings/remoteproc/amd,bram-rproc.yaml   | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/Documentation/devicetree/bindings/remoteproc/amd,bram-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/amd,bram-rproc.yaml
index c0359f447ea8..462bd4be087d 100644
--- a/Documentation/devicetree/bindings/remoteproc/amd,bram-rproc.yaml
+++ b/Documentation/devicetree/bindings/remoteproc/amd,bram-rproc.yaml
@@ -84,6 +84,23 @@ properties:
     description:
       GPIO specifier controlling the soft-core reset input.
 
+  mboxes:
+    maxItems: 2
+
+  mbox-names:
+    items:
+      - const: tx
+      - const: rx
+
+  memory-region:
+    maxItems: 3
+
+  memory-region-names:
+    items:
+      - const: vdev0vring0
+      - const: vdev0vring1
+      - const: vdev0buffer
+
 required:
   - compatible
   - reg
@@ -101,5 +118,9 @@ examples:
       clocks = <&pl_clk>;
       firmware-name = "firmware.elf";
       reset-gpios = <&gpio0 0 GPIO_ACTIVE_LOW>;
+      mboxes = <&mbv_mbox0 0>, <&mbv_mbox0 1>;
+      mbox-names = "tx", "rx";
+      memory-region = <&mbv_vring0>, <&mbv_vring1>, <&mbv_vdev0buffer>;
+      memory-region-names = "vdev0vring0", "vdev0vring1", "vdev0buffer";
     };
 ...
-- 
2.34.1