[PATCH 1/2] dt-bindings: spi: add bindings for spi-virtio

[Francesco Valla]

Add bindings for spi-virtio based on virtio-device, reflecting what
already exists for gpio-virtio and i2c-virtio. A node using the bindings
is not used to instantiate the device, which is registered by the
transport (e.g.: virtio-mmio), but to define its properties and
establish dependencies with other nodes.

Add the new bindings inside the MAINTAINERS file.

Signed-off-by: Francesco Valla <francesco@xxxxxxxx>
---
 .../devicetree/bindings/spi/spi-virtio.yaml        | 53 ++++++++++++++++++++++
 MAINTAINERS                                        |  1 +
 2 files changed, 54 insertions(+)

diff --git a/Documentation/devicetree/bindings/spi/spi-virtio.yaml b/Documentation/devicetree/bindings/spi/spi-virtio.yaml
new file mode 100644
index 000000000000..5b8639dd2e1f
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-virtio.yaml
@@ -0,0 +1,53 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/spi-virtio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Virtio SPI controller device
+
+maintainers:
+  - Francesco Valla <francesco@xxxxxxxx>
+
+allOf:
+  - $ref: /schemas/spi/spi-controller.yaml#
+  - $ref: /schemas/virtio/virtio-device.yaml#
+
+description:
+  Virtio SPI controller device, see /schemas/virtio/virtio-device.yaml for
+  more details.
+
+properties:
+  $nodename:
+    const: spi
+
+  compatible:
+    const: virtio,device2d
+
+required:
+  - compatible
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    virtio@3000 {
+        compatible = "virtio,mmio";
+        reg = <0x3000 0x100>;
+        interrupts = <41>;
+
+        spi {
+            compatible = "virtio,device2d";
+
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            sram@0 {
+                compatible = "microchip,mchp23k256";
+                reg = <0>;
+                spi-max-frequency = <20000000>;
+            };
+        };
+    };
+
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 360977678f70..f91340fc6e7f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -29062,6 +29062,7 @@ VIRTIO SPI DRIVER
 M:	Haixu Cui <quic_haixcui@xxxxxxxxxxx>
 L:	virtualization@xxxxxxxxxxxxxxx
 S:	Maintained
+F:	Documentation/devicetree/bindings/spi/spi-virtio.yaml
 F:	drivers/spi/spi-virtio.c
 F:	include/uapi/linux/virtio_spi.h
 

-- 
2.55.0