linux-kernel - Re: [PATCH v4 1/2] dt-bindings: input: bindings for Adafruit Seesaw Gamepad

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Message-ID: <20231012-woof-fit-8f5c163f07b0@spud>
Date:   Thu, 12 Oct 2023 16:46:53 +0100
From:   Conor Dooley <conor@...nel.org>
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>,
        Shuah Khan <skhan@...uxfoundation.org>,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/2] dt-bindings: input: bindings for Adafruit Seesaw
 Gamepad

On Thu, Oct 12, 2023 at 12:29:58AM +0530, Anshul Dalal wrote:
> Hello,
> 
> On 10/11/23 21:45, Conor Dooley wrote:
> > Hey,
> > 
> > On Wed, Oct 11, 2023 at 12:18:23AM +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
> >>
> >> Signed-off-by: Anshul Dalal <anshulusr@...il.com>
> >> ---
> >>
> >> 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        | 59 +++++++++++++++++++
> >>  1 file changed, 59 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..e8e676006d2f
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/input/adafruit,seesaw-gamepad.yaml
> >> @@ -0,0 +1,59 @@
> >> +# 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
> > 
> > Binding mostly looks good to me. My main question is what is a seesaw?
> > 
> 
> Seesaw is a universal framework that enables extending I/O capabilities
> of the i2c master devices with a compatible breakout board. As it
> relates to the binding, this gamepad uses an AVR ATtiny816
> microcontroller that reads the data from the buttons and the joystick
> and sends the data to the master over i2c using the Seesaw framework.

Right. Not a framework I was aware of, thanks for explaining.

> 
> >> +
> >> +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
> >> +
> >> +  Product page: https://www.adafruit.com/product/5743
> >> +  Arduino Driver: https://github.com/adafruit/Adafruit_Seesaw
> > 
> > I'm not really sure what the arduino driver has to do with the binding.
> > Why is a link to it more relevant than the freebsd driver, or the linux
> > driver etc? Is there info about how the pad works in the arduino driver
> > 
> > Otherwise, this seems good to me.

> The Arduino driver I linked was the only resource that had the
> implementation of the seesaw framework as well as the example code
> specific to this device:
> https://github.com/adafruit/Adafruit_Seesaw/tree/master/examples/Mini_I2C_Gamepad_QT
> On further thought, a link to the accompanying document from the
> manufacturer (https://cdn-learn.adafruit.com/downloads/pdf/gamepad-qt.pdf)
> might be more relevant for the binding which includes the hardware
> description as well as links to the above-mentioned Arduino driver.

A link to the manufacturer docs would be nice & if, as you say, the
arduino driver was a useful resource for understanding the hardware then
I suppose it can stay too :)

Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>

Thanks,
Conor.

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