linux-kernel - Re: [PATCH 1/2] dt-bindings: touchscreen: Add touchscreen schema

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Message-ID: <CAL_JsqKDqea2r-ocsj4U6Uv8p4zoANzWgq6a49F3EvBEeRqD0w@mail.gmail.com>
Date:   Tue, 7 Jan 2020 11:47:46 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Benjamin Gaignard <benjamin.gaignard@...com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Linux Input <linux-input@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Yannick Fertre <yannick.fertre@...com>
Subject: Re: [PATCH 1/2] dt-bindings: touchscreen: Add touchscreen schema

On Tue, Jan 7, 2020 at 7:09 AM Benjamin Gaignard
<benjamin.gaignard@...com> wrote:
>
> Add touchscreen schema for common properties
>
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...com>
> ---
>  .../bindings/input/touchscreen/touchscreen.yaml    | 63 ++++++++++++++++++++++
>  1 file changed, 63 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/touchscreen/touchscreen.yaml

Don't just add schema. Remove the old definitions. To avoid updating a
bunch of references to touchscreen.txt, I just put a 'see
touchscreen.yaml' in it.

> diff --git a/Documentation/devicetree/bindings/input/touchscreen/touchscreen.yaml b/Documentation/devicetree/bindings/input/touchscreen/touchscreen.yaml
> new file mode 100644
> index 000000000000..f6e7c73ef14e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/touchscreen/touchscreen.yaml
> @@ -0,0 +1,63 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/input/touchscreen/touchscreen.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Common touchscreen Bindings
> +
> +maintainers:
> +  - Dmitry Torokhov <dmitry.torokhov@...il.com>
> +
> +properties:
> +  touchscreen-min-x:
> +    description: minimum x coordinate reported (0 if not set)

You need a type reference on a bunch of these. And "(0 if not set)"
sounds like a 'default' constraint.

> +
> +  touchscreen-min-y:
> +    description: minimum y coordinate reported (0 if not set)
> +
> +  touchscreen-size-x:
> +    description: horizontal resolution of touchscreen (maximum x coordinate reported + 1)
> +
> +  touchscreen-size-y:
> +    description: vertical resolution of touchscreen (maximum y coordinate reported + 1)

I don't think it makes sense if both of these aren't present, so you need:

dependencies:
  touchscreen-size-x: [ touchscreen-size-y ]
  touchscreen-size-y: [ touchscreen-size-x ]

> +
> +  touchscreen-max-pressure:
> +    description: maximum reported pressure (arbitrary range dependent on the controller)
> +
> +  touchscreen-min-pressure:
> +    description: minimum pressure on the touchscreen to be achieved in order for the
> +                 touchscreen driver to report a touch event.
> +
> +  touchscreen-fuzz-x:
> +    description: horizontal noise value of the absolute input device (in pixels)
> +
> +  touchscreen-fuzz-y:
> +    description: vertical noise value of the absolute input device (in pixels)
> +
> +  touchscreen-fuzz-pressure:
> +    description: pressure noise value of the absolute input device (arbitrary range
> +                 dependent on the controller)
> +
> +  touchscreen-average-samples:
> +    description: Number of data samples which are averaged for each read (valid values
> +                 dependent on the controller)
> +
> +  touchscreen-inverted-x:
> +    description: X axis is inverted (boolean)
> +    type: boolean
> +
> +  touchscreen-inverted-y:
> +    description: Y axis is inverted (boolean)
> +    type: boolean
> +
> +  touchscreen-swapped-x-y:
> +    description: X and Y axis are swapped (boolean)
> +                 Swapping is done after inverting the axis
> +    type: boolean
> +
> +  touchscreen-x-mm:
> +    description: horizontal length in mm of the touchscreen
> +
> +  touchscreen-y-mm:
> +    description: vertical length in mm of the touchscreen

Same dependencies here.

Rob