Re: [PATCH v2 1/3] dt-bindings: display: Add Sitronix ST7571 panel

[Krzysztof Kozlowski <krzk@kernel.org>]

On 04/04/2025 15:50, Marcus Folkesson wrote:
> Sitronix ST7571 is a 4bit gray scale dot matrix LCD controller.
> 
> Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
> ---
>  .../bindings/display/sitronix,st7571.yaml          | 73 ++++++++++++++++++++++
>  1 file changed, 73 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/sitronix,st7571.yaml b/Documentation/devicetree/bindings/display/sitronix,st7571.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..11575b820c59c5ada427fbb6b015c331215c8db6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/sitronix,st7571.yaml
> @@ -0,0 +1,73 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/sitronix,st7571.yaml#

Why isn't this in panels directory?

> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Sitronix ST7571 Display Panels
> +
> +maintainers:
> +  - Marcus Folkesson <marcus.folkesson@gmail.com>
> +
> +description:
> +  This binding is for display panels using a Sitronix ST7571 controller in I2C

Do not explain for a binding that it is a binding. Redundant. Instead
describe the hardware.

> +  mode.
> +
> +allOf:
> +  - $ref: panel/panel-common.yaml#
> +
> +properties:
> +  compatible:
> +    const: sitronix,st7571
> +
> +  reg: true
> +  reset-gpios: true
> +  width-mm: true
> +  height-mm: true
> +
> +  panel-timing:
> +    $ref: panel/panel-timing.yaml#

Drop, already part of panel.

> +    description: |
> +      The panel-timing node specifies the display resolution and timing
> +      parameters. The hactive and vactive properties are mandatory.
> +      The vback-porch property specifies the start line of the display.
> +      The other properties should be set to zero.

Drop description as well.

> +
> +required:
> +  - compatible
> +  - reg
> +  - reset-gpios
> +  - width-mm
> +  - height-mm
> +  - panel-timing
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        display@3f {

Not much improved. How is this called in every other binding? panel.

> +          compatible = "sitronix,st7571";

Messed indentation.

> +          reg = <0x3f>;
> +          reset-gpios = <&gpio0 3 GPIO_ACTIVE_LOW>;
> +          width-mm = <37>;
> +          height-mm = <27>;
> +
> +            panel-timing {

And here is even more confusing.

Best regards,
Krzysztof