linux-kernel - Re: [PATCH v2] dt-bindings: touchscreen: Convert resistive-adc-touch binding to json schema

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Date:   Tue, 18 May 2021 09:47:22 -0500
From:   Rob Herring <robh@...nel.org>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        kernel@...gutronix.de, linux-kernel@...r.kernel.org,
        linux-input@...r.kernel.org, David Jander <david@...tonic.nl>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2] dt-bindings: touchscreen: Convert resistive-adc-touch
 binding to json schema

On Mon, May 17, 2021 at 09:18:24AM +0200, Oleksij Rempel wrote:
> Convert the resistive-adc-touch binding to DT schema format using json-schema.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
>  .../input/touchscreen/resistive-adc-touch.txt | 33 ----------
>  .../touchscreen/resistive-adc-touch.yaml      | 61 +++++++++++++++++++
>  2 files changed, 61 insertions(+), 33 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt
>  create mode 100644 Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.yaml
> 
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt b/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt
> deleted file mode 100644
> index af5223bb5bdd..000000000000
> --- a/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt
> +++ /dev/null
> @@ -1,33 +0,0 @@
> -Generic resistive touchscreen ADC
> -
> -Required properties:
> -
> - - compatible: must be "resistive-adc-touch"
> -The device must be connected to an ADC device that provides channels for
> -position measurement and optional pressure.
> -Refer to
> -https://github.com/devicetree-org/dt-schema/blob/master/schemas/iio/iio-consumer.yaml
> -for details
> -
> - - iio-channels: must have at least two channels connected to an ADC device.
> -These should correspond to the channels exposed by the ADC device and should
> -have the right index as the ADC device registers them. These channels
> -represent the relative position on the "x" and "y" axes.
> - - iio-channel-names: must have all the channels' names. Mandatory channels
> -are "x" and "y".
> -
> -Optional properties:
> - - iio-channels: The third channel named "pressure" is optional and can be
> -used if the ADC device also measures pressure besides position.
> -If this channel is missing, pressure will be ignored and the touchscreen
> -will only report position.
> - - iio-channel-names: optional channel named "pressure".
> -
> -Example:
> -
> -	resistive_touch: resistive_touch {
> -		compatible = "resistive-adc-touch";
> -		touchscreen-min-pressure = <50000>;
> -		io-channels = <&adc 24>, <&adc 25>, <&adc 26>;
> -		io-channel-names = "x", "y", "pressure";
> -	};
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.yaml b/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.yaml
> new file mode 100644
> index 000000000000..53df21a6589e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.yaml
> @@ -0,0 +1,61 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/input/touchscreen/resistive-adc-touch.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Generic resistive touchscreen ADC
> +
> +maintainers:
> +  - Oleksij Rempel <o.rempel@...gutronix.de>
> +
> +description: |
> +  Generic ADC based resistive touchscreen controller
> +  The device must be connected to an ADC device that provides channels for
> +  position measurement and optional pressure.
> +
> +allOf:
> +  - $ref: touchscreen.yaml#
> +
> +properties:
> +  compatible:
> +    const: resistive-adc-touch
> +
> +  io-channels:
> +    minItems: 2
> +    maxItems: 3

maxItems is implied by the 'items' length.

> +    items:
> +      - description: x
> +      - description: y
> +      - description: pressure (optional)
> +
> +  io-channel-names:

This needs minItems, too.

> +    items:
> +      - const: x
> +      - const: y
> +      - const: pressure
> +
> +  touchscreen-size-x: true
> +  touchscreen-size-y: true
> +  touchscreen-fuzz-x: true
> +  touchscreen-fuzz-y: true
> +  touchscreen-inverted-x: true
> +  touchscreen-inverted-y: true
> +  touchscreen-swapped-x-y: true
> +  touchscreen-min-pressure: true
> +
> +additionalProperties: false
> +
> +required:
> +  - compatible
> +  - io-channels
> +  - io-channel-names
> +
> +examples:
> +  - |
> +    resistive_touch {

touchscreen {

> +      compatible = "resistive-adc-touch";
> +      touchscreen-min-pressure = <50000>;
> +      io-channels = <&adc 24>, <&adc 25>, <&adc 26>;
> +      io-channel-names = "x", "y", "pressure";
> +    };
> -- 
> 2.29.2
>