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

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Message-ID: <7ef752b4-915b-4f9d-8425-79df8195656b@gmail.com>
Date:   Mon, 23 Oct 2023 17:28:10 +0530
From:   Anshul Dalal <anshulusr@...il.com>
To:     Jeff LaBundy <jeff@...undy.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

Hello Jeff,

On 10/23/23 05:17, Jeff LaBundy wrote:
> 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.
> 

The driver currently implements only a subset of the functionality in
the Adafruit Seesaw specification. I eventually plan on adding adding
full support for the Seesaw framework in the form of a driver for the
atsamd09 seesaw breakout board:
https://learn.adafruit.com/adafruit-seesaw-atsamd09-breakout

Then I think it would be better for this driver to use the newly exposed
seesaw APIs by the atsamd09 driver instead of relying on kernel's i2c APIs.

I would also like to add support for the provided interrupt pin later
down the line which is documented in the binding along with description
of the non-standard action button layout.

Above were my reasons for going for a standalone binding, please let me
know if you disagree.

>> ---
>>
>> 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

Thank you,
Anshul Dalal