linux-kernel - [PATCH V3 1/5] dt-bindings: virtio: Add binding for virtio devices

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Date:   Mon, 26 Jul 2021 10:21:41 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Jason Wang <jasowang@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Arnd Bergmann <arnd@...nel.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Vincent Guittot <vincent.guittot@...aro.org>,
        Bill Mills <bill.mills@...aro.org>,
        Alex Bennée <alex.bennee@...aro.org>,
        "Enrico Weigelt, metux IT consult" <info@...ux.net>,
        Jie Deng <jie.deng@...el.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: [PATCH V3 1/5] dt-bindings: virtio: Add binding for virtio devices

Allow virtio device sub-nodes to be added to the virtio mmio or pci
nodes. The compatible property for virtio device must be of format
"virtio,<DID>", where DID is virtio device ID in hexadecimal format.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 .../devicetree/bindings/virtio/mmio.yaml      |  2 +-
 .../bindings/virtio/virtio-device.yaml        | 47 +++++++++++++++++++
 2 files changed, 48 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/virtio/virtio-device.yaml

diff --git a/Documentation/devicetree/bindings/virtio/mmio.yaml b/Documentation/devicetree/bindings/virtio/mmio.yaml
index d46597028cf1..1b91553f87c6 100644
--- a/Documentation/devicetree/bindings/virtio/mmio.yaml
+++ b/Documentation/devicetree/bindings/virtio/mmio.yaml
@@ -36,7 +36,7 @@ title: virtio memory mapped devices
   - reg
   - interrupts
 
-additionalProperties: false
+additionalProperties: true
 
 examples:
   - |
diff --git a/Documentation/devicetree/bindings/virtio/virtio-device.yaml b/Documentation/devicetree/bindings/virtio/virtio-device.yaml
new file mode 100644
index 000000000000..15cb6df8c98a
--- /dev/null
+++ b/Documentation/devicetree/bindings/virtio/virtio-device.yaml
@@ -0,0 +1,47 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/virtio/virtio-device.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Virtio device bindings
+
+maintainers:
+  - Viresh Kumar <viresh.kumar@...aro.org>
+
+description:
+  These bindings are applicable to virtio devices irrespective of the bus they
+  are bound to, like mmio or pci.
+
+# We need a select here so we don't match all nodes with 'virtio,mmio'
+properties:
+  $nodename:
+    pattern: '^[a-z0-9]+-virtio(-[a-z0-9]+)?$'
+    description: |
+      Exactly one node describing the virtio device. The name of the node isn't
+      significant but its phandle can be used to by a user of the virtio device.
+
+  compatible:
+    pattern: "^virtio,[0-9a-f]+$"
+    description: Virtio device nodes.
+      "virtio,DID", where DID is the virtio device id. The textual
+      representation of DID shall be in lower case hexadecimal with leading
+      zeroes suppressed.
+
+required:
+  - compatible
+
+additionalProperties: true
+
+examples:
+  - |
+    virtio@...0 {
+        compatible = "virtio,mmio";
+        reg = <0x3000 0x100>;
+        interrupts = <43>;
+
+        i2c-virtio {
+            compatible = "virtio,22";
+        };
+    };
+...
-- 
2.31.1.272.g89b43f80a514