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

[Rob Herring]

On Mon, May 02, 2022 at 10:04:03AM -0500, Daniel Kaehn wrote:
> 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.

s/resuts/results/

> +
> +properties:
> +  compatible:
> +    const: serialmidi

serial-midi would be a bit more readable. (And then align the filename 
with that.)

> +
> +  current-speed:
> +    $ref: /schemas/types.yaml#/definitions/uint32

Already has a type applied by serial.yaml, so you can drop.

> +    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
> 
>