linux-kernel - [PATCH 1/6] dt-bindings: Add Bao IPC shared memory driver binding

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Message-ID: <20260107162829.416885-2-joaopeixoto@osyx.tech>
Date: Wed,  7 Jan 2026 16:28:24 +0000
From: joaopeixoto@...x.tech
To: linux-kernel@...r.kernel.org
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Subject: [PATCH 1/6] dt-bindings: Add Bao IPC shared memory driver binding

From: João Peixoto <joaopeixoto@...x.tech>

This patch introduces a device tree binding for the Bao IPC Shared Memory
device, which enables communication between Bao hypervisor guests through
dedicated shared-memory regions.

Signed-off-by: João Peixoto <joaopeixoto@...x.tech>
---
 .../devicetree/bindings/bao/bao,ipcshmem.yaml | 82 +++++++++++++++++++
 .../devicetree/bindings/vendor-prefixes.yaml  |  2 +
 2 files changed, 84 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/bao/bao,ipcshmem.yaml

diff --git a/Documentation/devicetree/bindings/bao/bao,ipcshmem.yaml b/Documentation/devicetree/bindings/bao/bao,ipcshmem.yaml
new file mode 100644
index 000000000000..fa91800db99a
--- /dev/null
+++ b/Documentation/devicetree/bindings/bao/bao,ipcshmem.yaml
@@ -0,0 +1,82 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/bao/bao,ipcshmem.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Bao IPC Shared Memory Device
+
+maintainers:
+  - José Martins <jose@...x.tech>
+  - David Cerdeira <davidmcerdeira@...x.tech>
+  - João Peixoto <joaopeixoto@...x.tech>
+
+description: |
+  Shared memory based communication device for Bao hypervisor guests.
+
+  The device describes a set of shared-memory regions used for
+  communication between Bao guests. Each guest instantiating this
+  device uses one region for reading data produced by a peer guest
+  and another region for writing data consumed by that peer.
+
+properties:
+  compatible:
+    const: bao,ipcshmem
+
+  reg:
+    description:
+      Shared memory region used for IPC.
+    minItems: 2
+    maxItems: 2
+
+  read-channel:
+    description: |
+      Shared-memory sub-region that this guest reads from.
+
+      This region is written by the peer Bao guest and read by the
+      guest instantiating this device.
+
+      Consists of two cells:
+        - offset into the shared-memory region defined by `reg`
+        - size in bytes
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 2
+    maxItems: 2
+
+  write-channel:
+    description: |
+      Shared-memory sub-region that this guest writes to.
+
+      This region is written by the guest instantiating this device and
+      read by the peer Bao guest.
+
+      Consists of two cells:
+        - offset into the shared-memory region defined by `reg`
+        - size in bytes
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    minItems: 2
+    maxItems: 2
+
+  id:
+    description:
+      Driver instance ID.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+required:
+  - compatible
+  - reg
+  - read-channel
+  - write-channel
+  - id
+
+additionalProperties: false
+
+examples:
+  - |
+    bao-ipc@...00000 {
+        compatible = "bao,ipcshmem";
+        reg = <0x0 0xf0000000 0x0 0x00010000>;
+        read-channel = <0x0 0x2000>;
+        write-channel = <0x2000 0x2000>;
+        id = <0>;
+    };
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index c7591b2aec2a..c047fbd6b91a 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
@@ -223,6 +223,8 @@ patternProperties:
     description: Shenzhen AZW Technology Co., Ltd.
   "^baikal,.*":
     description: BAIKAL ELECTRONICS, JSC
+  "^bao,.*":
+    description: Bao Hypervisor
   "^bananapi,.*":
     description: BIPAI KEJI LIMITED
   "^beacon,.*":
-- 
2.43.0