linux-kernel - Re: [PATCH 1/3] devicetree/bindings: Initial commit of wacom,wacom-i2c

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Message-ID: <YAeSL1PSo0vn7E/5@google.com>
Date:   Tue, 19 Jan 2021 18:15:11 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Alistair Francis <alistair@...stair23.me>
Cc:     linux-input@...r.kernel.org, linux-imx@....com,
        kernel@...gutronix.de, linux-kernel@...r.kernel.org,
        alistair23@...il.com
Subject: Re: [PATCH 1/3] devicetree/bindings: Initial commit of
 wacom,wacom-i2c

Hi Alistair,

On Sat, Jan 16, 2021 at 08:24:26PM -0800, Alistair Francis wrote:
> Signed-off-by: Alistair Francis <alistair@...stair23.me>
> ---
>  .../input/touchscreen/wacom,wacom-i2c.yaml    | 55 +++++++++++++++++++
>  .../devicetree/bindings/vendor-prefixes.yaml  |  2 +
>  2 files changed, 57 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/touchscreen/wacom,wacom-i2c.yaml
> 
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/wacom,wacom-i2c.yaml b/Documentation/devicetree/bindings/input/touchscreen/wacom,wacom-i2c.yaml
> new file mode 100644
> index 000000000000..6b0e0034f836
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/touchscreen/wacom,wacom-i2c.yaml
> @@ -0,0 +1,55 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/input/touchscreen/wacom,wacom-i2c.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Wacom I2C Controller
> +
> +maintainers:
> +  - Alistair Francis <alistair@...stair23.me>
> +
> +allOf:
> +  - $ref: touchscreen.yaml#
> +
> +properties:
> +  compatible:
> +    const: wacom,wacom-i2c
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  flip-tilt-x:
> +  flip-tilt-y:

Does the device support tilt? The driver does not, at least at the
moment. Also, does it make sense to flip tilt but not position?

> +  flip-pos-x:
> +  flip-pos-y:

This needs to use standard touchscreen properties. See
Documentation/devicetree/bindings/input/touchscreen/touchscreen.yaml

> +  flip-distance:

I am having trouble understanding when this one would be useful.

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include "dt-bindings/interrupt-controller/irq.h"
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        digitiser@9 {
> +                compatible = "wacom,wacom-i2c";
> +                reg = <0x9>;
> +                interrupt-parent = <&gpio1>;
> +                interrupts = <9 IRQ_TYPE_LEVEL_LOW>;
> +                flip-tilt-x;
> +                flip-tilt-y;
> +                flip-pos-x;
> +                flip-pos-y;
> +                flip-distance;
> +        };
> +    };
> diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
> index 041ae90b0d8f..5bca22f035a3 100644
> --- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
> +++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
> @@ -1202,6 +1202,8 @@ patternProperties:
>      description: Vision Optical Technology Co., Ltd.
>    "^vxt,.*":
>      description: VXT Ltd
> +  "^wacom,.*":
> +    description: Wacom Co., Ltd
>    "^wand,.*":
>      description: Wandbord (Technexion)
>    "^waveshare,.*":
> -- 
> 2.29.2
> 

Thanks.

-- 
Dmitry