linux-kernel - Re: [PATCH RFC 1/4] dt-bindings: input: document Goodix Berlin Touchscreen IC

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Message-ID: <45ad07cf-c046-876f-1374-0a83fa561107@linaro.org>
Date:   Wed, 7 Jun 2023 10:35:57 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Neil Armstrong <neil.armstrong@...aro.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bastien Nocera <hadess@...ess.net>,
        Hans de Goede <hdegoede@...hat.com>,
        Henrik Rydberg <rydberg@...math.org>
Cc:     linux-input@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 1/4] dt-bindings: input: document Goodix Berlin
 Touchscreen IC

On 06/06/2023 16:31, Neil Armstrong wrote:
> Document the Goodix GT9916 wich is part of the "Berlin" serie
> of Touchscreen controllers IC from Goodix.
> 
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>  .../bindings/input/touchscreen/goodix-berlin.yaml  | 81 ++++++++++++++++++++++

Filename like compatible, so at least with vendor,device style.
Preferably named exactly like compatible, since you have only one.

>  1 file changed, 81 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/goodix-berlin.yaml b/Documentation/devicetree/bindings/input/touchscreen/goodix-berlin.yaml
> new file mode 100644
> index 000000000000..4c24a541e919
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/touchscreen/goodix-berlin.yaml
> @@ -0,0 +1,81 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/input/touchscreen/goodix-berlin.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Goodix Belin series touchscreen controller
> +
> +maintainers:
> +  - Neil Armstrong <neil.armstrong@...aro.org>
> +
> +allOf:
> +  - $ref: touchscreen.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - goodix,gt9916
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  reset-gpios:
> +    maxItems: 1
> +
> +  avdd-supply:
> +    description: Analog power supply regulator on AVDD pin
> +
> +  vddio-supply:
> +    description: GPIO power supply regulator on VDDIO pin
> +
> +  spi-max-frequency: true
> +  touchscreen-inverted-x: true
> +  touchscreen-inverted-y: true
> +  touchscreen-size-x: true
> +  touchscreen-size-y: true
> +  touchscreen-swapped-x-y: true
> +
> +additionalProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts

I bet supplies are required - at least one of them. If hardware needs
them, they should be required by the bindings.

> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/gpio/gpio.h>
> +    i2c {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +      gt9916@5d {

Node names should be generic. See also explanation and list of examples
in DT specification:
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

touchscreen?

> +        compatible = "goodix,gt9916";
> +        reg = <0x5d>;
> +        interrupt-parent = <&gpio>;
> +        interrupts = <25 IRQ_TYPE_LEVEL_LOW>;
> +        reset-gpios = <&gpio1 1 GPIO_ACTIVE_LOW>;
> +      };
> +    };


Best regards,
Krzysztof