linux-kernel - Re: [PATCH v3 3/3] dt-bindings: touchscreen: Add binding for Novatek NT36xxx series driver

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Message-ID: <CAJKOXPcKPXFehzoa65YxjY8+qs-8JxAzj-ER58Y2V43RMD1qYQ@mail.gmail.com>
Date:   Thu, 8 Oct 2020 08:54:26 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     kholk11@...il.com
Cc:     dmitry.torokhov@...il.com, robh+dt@...nel.org, rydberg@...math.org,
        priv.luk@...il.com, linux-input@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        marijns95@...il.com, konradybcio@...il.com,
        martin.botka1@...il.com, phone-devel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] dt-bindings: touchscreen: Add binding for Novatek
 NT36xxx series driver

On Wed, 7 Oct 2020 at 20:22, <kholk11@...il.com> wrote:
>
> From: AngeloGioacchino Del Regno <kholk11@...il.com>
>
> Add binding for the Novatek NT36xxx series touchscreen driver.
>
> Signed-off-by: AngeloGioacchino Del Regno <kholk11@...il.com>
> ---
>  .../input/touchscreen/novatek,nt36xxx.yaml    | 56 +++++++++++++++++++
>  1 file changed, 56 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/touchscreen/novatek,nt36xxx.yaml
>
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/novatek,nt36xxx.yaml b/Documentation/devicetree/bindings/input/touchscreen/novatek,nt36xxx.yaml
> new file mode 100644
> index 000000000000..9f350f4e6d6a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/touchscreen/novatek,nt36xxx.yaml
> @@ -0,0 +1,56 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/input/touchscreen/novatek,nt36xxx.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Novatek NT36xxx series touchscreen controller Bindings
> +
> +maintainers:
> +  - TBD

Hi,

It is surprising that this is your v3 and you put here TBD. In such
case, add here subsystem maintainer:
Dmitry Torokhov <dmitry.torokhov@...il.com>


> +
> +allOf:
> +  - $ref: touchscreen.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - novatek,nt36xxx

This is not an enum, but one const.

> +
> +  reg:
> +    enum: [ 0x62 ]

Usually addresses are fixed in schema, because they could change (e.g.
by some pin configuration). Just use maxItems: 1.

> +
> +  interrupts:
> +    maxItems: 1
> +
> +  reset-gpio:
> +    maxItems: 1
> +
> +  vdd-supply:
> +    description: Power supply regulator for VDD pin
> +
> +  vio-reg-name:
> +    description: Power supply regulator on VDD-IO pin

What is this for? Is it a supply for the device or the device is a
regulator provider?

> +
> +additionalProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +
> +examples:
> +  - |
> +    i2c {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +      nt36xxx@62 {

Incorrect node name - should be touchscreen.

Best regards,
Krzysztof