linux-kernel - Re: [PATCH v5 1/2] dt-bindings: input: bindings for Adafruit Seesaw Gamepad

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Message-ID: <ZTW0p2WG3/m1Tx+Z@nixie71>
Date:   Sun, 22 Oct 2023 18:47:51 -0500
From:   Jeff LaBundy <jeff@...undy.com>
To:     Anshul Dalal <anshulusr@...il.com>
Cc:     linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Thomas Weißschuh <linux@...ssschuh.net>,
        Shuah Khan <skhan@...uxfoundation.org>,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-kernel@...r.kernel.org,
        Conor Dooley <conor.dooley@...rochip.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH v5 1/2] dt-bindings: input: bindings for Adafruit Seesaw
 Gamepad

Hi Anshul,

On Tue, Oct 17, 2023 at 09:13:44AM +0530, Anshul Dalal wrote:
> Adds bindings for the Adafruit Seesaw Gamepad.
> 
> The gamepad functions as an i2c device with the default address of 0x50
> and has an IRQ pin that can be enabled in the driver to allow for a rising
> edge trigger on each button press or joystick movement.
> 
> Product page:
>   https://www.adafruit.com/product/5743
> Arduino driver:
>   https://github.com/adafruit/Adafruit_Seesaw
> 
> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Signed-off-by: Anshul Dalal <anshulusr@...il.com>

Perhaps this ship has sailed, but is there any reason this simple device
cannot be added to Documentation/devicetree/bindings/trivial-devices.yaml
as opposed to having its own binding?

It has no vendor-specific properties, and the only properties are the
standard properties already understood by the I2C core. In case I have
misunderstood, please let me know.

> ---
> 
> Changes for v5:
> - Added link to the datasheet
> 
> Changes for v4:
> - Fixed the URI for the id field
> - Added `interrupts` property
> 
> Changes for v3:
> - Updated id field to reflect updated file name from previous version
> - Added `reg` property
> 
> Changes for v2:
> - Renamed file to `adafruit,seesaw-gamepad.yaml`
> - Removed quotes for `$id` and `$schema`
> - Removed "Bindings for" from the description
> - Changed node name to the generic name "joystick"
> - Changed compatible to 'adafruit,seesaw-gamepad' instead of
>   'adafruit,seesaw_gamepad'
> 
>  .../input/adafruit,seesaw-gamepad.yaml        | 60 +++++++++++++++++++
>  1 file changed, 60 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/adafruit,seesaw-gamepad.yaml
> 
> diff --git a/Documentation/devicetree/bindings/input/adafruit,seesaw-gamepad.yaml b/Documentation/devicetree/bindings/input/adafruit,seesaw-gamepad.yaml
> new file mode 100644
> index 000000000000..3f0d1c5a3b9b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/adafruit,seesaw-gamepad.yaml
> @@ -0,0 +1,60 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/input/adafruit,seesaw-gamepad.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Adafruit Mini I2C Gamepad with seesaw
> +
> +maintainers:
> +  - Anshul Dalal <anshulusr@...il.com>
> +
> +description: |
> +  Adafruit Mini I2C Gamepad
> +
> +    +-----------------------------+
> +    |   ___                       |
> +    |  /   \               (X)    |
> +    | |  S  |  __   __  (Y)   (A) |
> +    |  \___/  |ST| |SE|    (B)    |
> +    |                             |
> +    +-----------------------------+
> +
> +  S -> 10-bit percision bidirectional analog joystick
> +  ST -> Start
> +  SE -> Select
> +  X, A, B, Y -> Digital action buttons
> +
> +  Datasheet: https://cdn-learn.adafruit.com/downloads/pdf/gamepad-qt.pdf
> +  Product page: https://www.adafruit.com/product/5743
> +  Arduino Driver: https://github.com/adafruit/Adafruit_Seesaw
> +
> +properties:
> +  compatible:
> +    const: adafruit,seesaw-gamepad
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +    description:
> +      The gamepad's IRQ pin triggers a rising edge if interrupts are enabled.
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        joystick@50 {
> +            compatible = "adafruit,seesaw-gamepad";
> +            reg = <0x50>;
> +        };
> +    };
> -- 
> 2.42.0
> 

Kind regards,
Jeff LaBundy