linux-kernel - Re: [PATCH 1/2] dt-bindings: add binding for tft displays based on ilitek,ili9488

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Date:   Tue, 18 Oct 2022 14:27:16 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
Cc:     michael@...rulasolutions.com, linuxfancy@...glegroups.com,
        linux-amarula@...rulasolutions.com, kamlesh.gurudasani@...il.com,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Maxime Ripard <maxime@...no.tech>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Noralf Trønnes <noralf@...nnes.org>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: add binding for tft displays based on
 ilitek,ili9488

On 18/10/2022 12:45, Tommaso Merciai wrote:
> This binding is for the tft displays based on ilitek,ili9488.
> waveshare,waveshare,pico-rt-lcd-35 (waveshare pico-restouch-lcd-3.5)
> 
> Signed-off-by: Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
> ---
>  .../bindings/display/ilitek,ili9488.yaml      | 72 +++++++++++++++++++
>  1 file changed, 72 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/ilitek,ili9488.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/ilitek,ili9488.yaml b/Documentation/devicetree/bindings/display/ilitek,ili9488.yaml
> new file mode 100644
> index 0000000000000..879ecc42c350c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/ilitek,ili9488.yaml
> @@ -0,0 +1,72 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/ilitek,ili9488.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Ilitek ILI9488 display panels device tree bindings

Drop "device tree bindings"

> +
> +maintainers:
> +  - Kamlesh Gurudasani <kamlesh.gurudasani@...il.com>
> +  - Michael Trimarchi <michael@...rulasolutions.com>
> +  - Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
> +
> +description:
> +  This binding is for display panels using an Ilitek ILI9488 controller in SPI

Drop "This binding is for" and instead describe hardware.

> +  mode.
> +
> +allOf:
> +  - $ref: panel/panel-common.yaml#
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          # Waveshare 3.5" 320x480 Color TFT LCD
> +          - "waveshare,pico-rt-lcd-35"
> +      - const: ilitek,ili9488
> +
> +  spi-max-frequency:
> +    maximum: 20000000
> +
> +  dc-gpios:
> +    maxItems: 1
> +    description: Display data/command selection (D/CX)
> +
> +  backlight: true
> +  reg: true
> +  reset-gpios: true
> +  rotation: true
> +
> +required:
> +  - compatible
> +  - reg
> +  - dc-gpios
> +  - reset-gpios
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +
> +    backlight: backlight {
> +            compatible = "gpio-backlight";
> +            gpios = <&gpio 22 GPIO_ACTIVE_HIGH>;

Drop it, no need for this example.


> +    };
> +    spi {
> +            #address-cells = <1>;
> +            #size-cells = <0>;

Use 4 spaces for example indentation.

> +
> +

No need for two blank lines.

> +            display@0{
> +                    compatible = "waveshare,pico-rt-lcd-35", "ilitek,ili9488";
> +                    reg = <0>;
> +                    spi-max-frequency = <20000000>;
> +                    dc-gpios = <&gpio0 24 GPIO_ACTIVE_HIGH>;
> +                    reset-gpios = <&gpio0 25 GPIO_ACTIVE_HIGH>;
> +                    backlight = <&backlight>;
> +            };
> +    };
> +
> +...

Best regards,
Krzysztof