[PATCH v5 1/2] dt-bindings: sound: Add generic serial MIDI device

[Daniel Kaehn]

Adds dt-binding for a Generic MIDI Interface using a serial device.

Signed-off-by: Daniel Kaehn <kaehndan at gmail.com>
---
 .../devicetree/bindings/sound/serialmidi.yaml | 46 +++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/serialmidi.yaml

diff --git a/Documentation/devicetree/bindings/sound/serialmidi.yaml b/Documentation/devicetree/bindings/sound/serialmidi.yaml
new file mode 100644
index 000000000000..06a894e1b91d
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/serialmidi.yaml
@@ -0,0 +1,46 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/serialmidi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Generic Serial MIDI Interface
+
+maintainers:
+  - Daniel Kaehn <kaehndan at gmail.com>
+
+description: 
+  Generic MIDI interface using a serial device. This denotes that a serial device is
+  dedicated to MIDI communication, either to an external MIDI device through a DIN5
+  or other connector, or to a known hardwired MIDI controller. This device must be a
+  child node of a serial node.
+
+  Can only be set to use standard baud rates corresponding to supported rates of the
+  parent serial device. If the standard MIDI baud of 31.25 kBaud is needed 
+  (as would be the case if interfacing with arbitrary external MIDI devices),
+  configure the clocks of the parent serial device so that a requested baud of 38.4 kBaud
+  resuts in the standard MIDI baud rate, and set the 'current-speed' property to 38400.
+
+properties:
+  compatible:
+    const: serialmidi
+
+  current-speed:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Baudrate to set the serial port to when this MIDI device is opened.
+      If not specified, the parent serial device is allowed to use its default baud.
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+    serial {
+        midi {
+            compatible = "serialmidi";
+            current-speed = <38400>;
+        };
+    };
-- 
2.33.0