linux-kernel - Re: [PATCH 1/2] dt-bindings: input: document Novatek NVT touchscreen controller

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Date: Tue, 21 May 2024 18:48:17 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: joelselvaraj.oss@...il.com, Hans de Goede <hdegoede@...hat.com>,
 Dmitry Torokhov <dmitry.torokhov@...il.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Cc: linux-input@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: input: document Novatek NVT touchscreen
 controller

On 21/05/2024 14:09, Joel Selvaraj via B4 Relay wrote:
> From: Joel Selvaraj <joelselvaraj.oss@...il.com>
> 
> Document the Novatek NVT touchscreen driver which is used in devices like

driver? or device?

> the Xiaomi Poco F1 [1]. Also, include the devictree binding file in the
> MAINTAINERS file.
> 
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/qcom/sdm845-xiaomi-beryllium-tianma.dts?h=v6.9
> 
> Signed-off-by: Joel Selvaraj <joelselvaraj.oss@...il.com>
> ---
>  .../bindings/input/touchscreen/novatek,nvt-ts.yaml | 62 ++++++++++++++++++++++
>  MAINTAINERS                                        |  1 +
>  2 files changed, 63 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/novatek,nvt-ts.yaml b/Documentation/devicetree/bindings/input/touchscreen/novatek,nvt-ts.yaml
> new file mode 100644
> index 0000000000000..7839c6a028e4a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/touchscreen/novatek,nvt-ts.yaml
> @@ -0,0 +1,62 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/input/touchscreen/novatek,nvt-ts.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Novatek NVT Touchscreen Controller
> +
> +maintainers:
> +  - Hans de Goede <hdegoede@...hat.com>
> +
> +allOf:
> +  - $ref: touchscreen.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - novatek,nvt-ts

That's too generic. Looking at your driver change, it is not even needed.

> +      - novatek,nt36672a-ts

Eh, we have already panel. Why there is a need for touchscreen binding
(binding, not driver)?

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  reset-gpios:
> +    maxItems: 1
> +
> +  vcc-supply: true
> +  iovcc-supply: true
> +
> +unevaluatedProperties: false

This goes after required:

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +


Best regards,
Krzysztof