linux-kernel - Re: [PATCH RFC 1/4] dt-bindings: input: touchscreen: Add Z2 controller bindings.

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Message-Id: <e26318db-77b1-4876-8a40-f707d11b5857@app.fastmail.com>
Date:   Fri, 24 Feb 2023 12:03:45 +0100
From:   "Sven Peter" <sven@...npeter.dev>
To:     "Sasha Finkelstein" <fnkl.kernel@...il.com>,
        "Hector Martin" <marcan@...can.st>,
        "Alyssa Rosenzweig" <alyssa@...enzweig.io>,
        "Dmitry Torokhov" <dmitry.torokhov@...il.com>,
        "Rob Herring" <robh+dt@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        - <asahi@...ts.linux.dev>, "Henrik Rydberg" <rydberg@...math.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-input@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 1/4] dt-bindings: input: touchscreen: Add Z2 controller
 bindings.



On Fri, Feb 24, 2023, at 11:20, Sasha Finkelstein via B4 Relay wrote:
> From: Sasha Finkelstein <fnkl.kernel@...il.com>
>
> Add bindings for touchscreen controllers attached using the Z2 protocol.
> Those are present in most Apple devices.
>
> Signed-off-by: Sasha Finkelstein <fnkl.kernel@...il.com>
> ---
>  .../input/touchscreen/apple,z2-touchscreen.yaml    | 81 ++++++++++++++++++++++
>  1 file changed, 81 insertions(+)
>
> diff --git 
> a/Documentation/devicetree/bindings/input/touchscreen/apple,z2-touchscreen.yaml 
> b/Documentation/devicetree/bindings/input/touchscreen/apple,z2-touchscreen.yaml
> new file mode 100644
> index 000000000000..695594494b1e
> --- /dev/null
> +++ 
> b/Documentation/devicetree/bindings/input/touchscreen/apple,z2-touchscreen.yaml
> @@ -0,0 +1,81 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: 
> http://devicetree.org/schemas/input/touchscreen/apple,z2-touchscreen.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Apple touchscreens attached using the Z2 protocol.
> +
> +maintainers:
> +  - asahi@...ts.linux.dev
> +  - Sasha Finkelstein <fnkl.kernel@...il.com>
> +
> +description: A series of touschscreen controllers used in Apple 
> products.
> +
> +allOf:
> +  - $ref: touchscreen.yaml#
> +  - $ref: /schemas/spi/spi-peripheral-props.yaml#
> +
> +properties:
> +  compatible:
> +    const: apple,z2-touchscreen
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts-extended:
> +    maxItems: 1
> +
> +  reset-gpios:
> +    maxItems: 1
> +
> +  cs-gpios:
> +    maxItems: 1
> +
> +  firmware-name:
> +    maxItems: 1
> +
> +  apple,z2-device-name:
> +    description: The name to be used for the input device
> +    $ref: /schemas/types.yaml#/definitions/string

Now that I thought about this again after the brief discussion we already had:
Do we even need to specify the device name? Is there any reason we can't just
always use something like "Apple Z2 TouchBar"?



Best,


Sven