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Date: Wed, 14 Jul 2021 17:10:08 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Rob Herring <robh+dt@...nel.org>, Jason Wang <jasowang@...hat.com>,
"Michael S. Tsirkin" <mst@...hat.com>,
Jean-Philippe Brucker <jean-philippe@...aro.org>,
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>,
DTML <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"open list:DRM DRIVER FOR QEMU'S CIRRUS DEVICE"
<virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH 1/5] dt-bindings: virtio: mmio: Add support for device
subnode
On 14-07-21, 07:56, Viresh Kumar wrote:
> I agree that even if the device is discoverable at runtime, we should
> still have some sort of stuff in DT to distinguish the devices, and
> "virtio,deviceDID" sounds good enough for that, considering that we
> already do it for USB, etc.
>
> And I am fine with both the ways, a new node or just using the parent
> node. So whatever you guys decide is fine.
I tried to write and see what it would look like after using the
existing nodes for mmio/pci and here is what I got. (I couldn't find
any virtio-pci bindings and so stayed away from adding any reference
to it here).
Does that look better ?
--
viresh
-------------------------8<-------------------------
diff --git a/Documentation/devicetree/bindings/virtio/mmio.yaml b/Documentation/devicetree/bindings/virtio/mmio.yaml
index d46597028cf1..324b810e51a5 100644
--- a/Documentation/devicetree/bindings/virtio/mmio.yaml
+++ b/Documentation/devicetree/bindings/virtio/mmio.yaml
@@ -15,7 +15,8 @@ title: virtio memory mapped devices
properties:
compatible:
- const: virtio,mmio
+ contains:
+ const: virtio,mmio
reg:
maxItems: 1
@@ -36,7 +37,7 @@ 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..9cfe090ea65f
--- /dev/null
+++ b/Documentation/devicetree/bindings/virtio/virtio-device.yaml
@@ -0,0 +1,49 @@
+# 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.
+
+allOf:
+ - $ref: /schemas/virtio/mmio.yaml#
+
+# We need a select here so we don't match all nodes with 'virtio,mmio'
+select:
+ properties:
+ compatible:
+ contains:
+ pattern: '^virtio,[0-9]+$'
+ required:
+ - compatible
+
+properties:
+ compatible:
+ contains:
+ oneOf:
+ - items:
+ - const: virtio,mmio
+ - pattern: '^virtio,[0-9]+$'
+
+required:
+ - compatible
+
+additionalProperties: true
+
+examples:
+ - |
+ i2c: i2c-virtio@...0 {
+ compatible = "virtio,mmio", "virtio,34";
+ reg = <0x3000 0x100>;
+ interrupts = <41>;
+ };
+
+...
diff --git a/Documentation/devicetree/bindings/gpio/gpio-virtio.yaml b/Documentation/devicetree/bindings/gpio/gpio-virtio.yaml
new file mode 100644
index 000000000000..8115ba794557
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-virtio.yaml
@@ -0,0 +1,63 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/gpio/gpio-virtio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Virtio GPIO controller
+
+maintainers:
+ - Viresh Kumar <viresh.kumar@...aro.org>
+
+allOf:
+ - $ref: /schemas/gpio/gpio.yaml#
+ - $ref: /schemas/virtio/virtio-device.yaml#
+
+# We need a select here so we don't match all nodes with 'virtio,mmio'
+select:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - virtio,41
+ required:
+ - compatible
+
+properties:
+ compatible:
+ oneOf:
+ - items:
+ - const: virtio,mmio
+ - const: virtio,41
+
+ gpio-controller: true
+
+ "#gpio-cells":
+ const: 2
+
+ interrupt-controller: true
+
+ "#interrupt-cells":
+ const: 2
+
+required:
+ - compatible
+ - gpio-controller
+ - "#gpio-cells"
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ gpio: gpio-virtio@...0 {
+ compatible = "virtio,mmio", "virtio,41";
+ reg = <0x3000 0x100>;
+ interrupts = <41>;
+
+ gpio-controller;
+ #gpio-cells = <2>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ };
+
+...
diff --git a/Documentation/devicetree/bindings/i2c/i2c-virtio.yaml b/Documentation/devicetree/bindings/i2c/i2c-virtio.yaml
new file mode 100644
index 000000000000..43e9910920d6
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/i2c-virtio.yaml
@@ -0,0 +1,54 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/i2c-virtio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Virtio I2C Adapter
+
+maintainers:
+ - Viresh Kumar <viresh.kumar@...aro.org>
+
+allOf:
+ - $ref: /schemas/i2c/i2c-controller.yaml#
+ - $ref: /schemas/virtio/virtio-device.yaml#
+
+# We need a select here so we don't match all nodes with 'virtio,mmio'
+select:
+ properties:
+ compatible:
+ contains:
+ enum:
+ - virtio,34
+ required:
+ - compatible
+
+properties:
+ compatible:
+ oneOf:
+ - items:
+ - const: virtio,mmio
+ - const: virtio,34
+
+required:
+ - compatible
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ i2c: i2c-virtio@...0 {
+ compatible = "virtio,mmio", "virtio,34";
+ reg = <0x3000 0x100>;
+ interrupts = <41>;
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ light-sensor@1c {
+ compatible = "dynaimage,al3320a";
+ reg = <0x20>;
+ };
+ };
+
+...
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