linux-kernel - Re: [PATCH v8 1/2] dt-bindings: input: bindings for Adafruit Seesaw Gamepad

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Message-ID: <0defc0e3-dc15-459d-9e71-64f3c38a6931@t-8ch.de>
Date:   Tue, 14 Nov 2023 20:20:46 +0100
From:   Thomas Weißschuh <linux@...ssschuh.net>
To:     Anshul Dalal <anshulusr@...il.com>
Cc:     linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        Conor Dooley <conor+dt@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jeff LaBundy <jeff@...undy.com>,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH v8 1/2] dt-bindings: input: bindings for Adafruit Seesaw
 Gamepad

On 2023-11-08 06:23:35+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>
> ---
> 
> Changes for v8:
> - no updates
> 
> Changes for v7:
> - no updates
> 
> Changes for v6:
> - no updates
> 
> 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

I don't really have any clue about devicetree, but shouldn't the actual
driver have an id-table for this "compatible"?

It had one up to v5 of the patchset.

Jeff had some comments about the OF aspect [0], but to me the state now
seems incorrect.
Maybe the DT can be dropped completely?

Jeff, could you advise?

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +    description:
> +      The gamepad's IRQ pin triggers a rising edge if interrupts are enabled.

Interrupts are not supported yet by the driver.
Should the property be there already?

> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        joystick@50 {
> +            compatible = "adafruit,seesaw-gamepad";
> +            reg = <0x50>;
> +        };
> +    };
> -- 
> 2.42.0

[0] https://lore.kernel.org/lkml/ZTWza+S+t+UZKlwu@nixie71/