Re: [PATCH v2 1/3] dt-bindings: display: convert Atmel's HLCDC to DT schema

[Conor Dooley <conor@kernel.org>]

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Yo,

On Tue, Jan 16, 2024 at 05:07:58PM +0530, Dharma Balasubiramani wrote:
> Convert the existing DT binding to DT schema of the Atmel's HLCDC display
> controller.
> 
> Signed-off-by: Dharma Balasubiramani <dharma.b@microchip.com>
> ---
> changelog
> v1 -> v2
> - Remove the explicit copyrights.
> - Modify filename like compatible.
> - Modify title (drop words like binding/driver).
> - Modify description actually describing the hardware and not the driver.
> - Remove pinctrl properties which aren't required.
> - Ref endpoint and not endpoint-base.
> - Drop redundant info about bus-width description and add ref to video-interfaces.
> - Move 'additionalProperties' after 'Required'.
> - Drop parent node and it's other sub-device node which are not related here.
> - Add compatible to example 2 and add comments that bus-width is the diff between two examples.
> ---
>  .../atmel/atmel,hlcdc-display-controller.yaml | 110 ++++++++++++++++++
>  .../bindings/display/atmel/hlcdc-dc.txt       |  75 ------------
>  2 files changed, 110 insertions(+), 75 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/display/atmel/atmel,hlcdc-display-controller.yaml
>  delete mode 100644 Documentation/devicetree/bindings/display/atmel/hlcdc-dc.txt
> 
> diff --git a/Documentation/devicetree/bindings/display/atmel/atmel,hlcdc-display-controller.yaml b/Documentation/devicetree/bindings/display/atmel/atmel,hlcdc-display-controller.yaml
> new file mode 100644
> index 000000000000..f022c294cfbc
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/atmel/atmel,hlcdc-display-controller.yaml
> @@ -0,0 +1,110 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/atmel/atmel,hlcdc-display-controller.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Atmel's High LCD Controller (HLCDC)
> +
> +maintainers:
> +  - Nicolas Ferre <nicolas.ferre@microchip.com>
> +  - Alexandre Belloni <alexandre.belloni@bootlin.com>
> +  - Claudiu Beznea <claudiu.beznea@tuxon.dev>
> +
> +description: |

This | is not needed as you have no formatting to preserve.

> +  The LCD Controller (LCDC) consists of logic for transferring LCD image
> +  data from an external display buffer to a TFT LCD panel. The LCDC has one
> +  display input buffer per layer that fetches pixels through the single bus
> +  host interface and a look-up table to allow palletized display
> +  configurations.
> +
> +properties:
> +  compatible:
> +    const: atmel,hlcdc-display-controller
> +
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 0
> +
> +  port@0:
> +    $ref: /schemas/graph.yaml#/$defs/port-base
> +    unevaluatedProperties: false
> +    description:
> +      Output endpoint of the controller, connecting the LCD panel signals.
> +
> +    properties:
> +      '#address-cells':
> +        const: 1
> +
> +      '#size-cells':
> +        const: 0
> +
> +      reg:
> +        maxItems: 1
> +
> +      endpoint:
> +        $ref: /schemas/graph.yaml#/$defs/endpoint

$ref: /schemas/media/video-interfaces.yaml#

to match approximately all other endpoints?

> +        unevaluatedProperties: false
> +        description:
> +          Endpoint connecting the LCD panel signals.
> +
> +        properties:
> +          bus-width:
> +            description: Endpoint bus width.
> +            $ref: /schemas/media/video-interfaces.yaml#

and then bus-width's type is already defined for you, no?

> +            enum: [ 12, 16, 18, 24 ]
> +
> +required:
> +  - '#address-cells'
> +  - '#size-cells'
> +  - compatible
> +  - port@0
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    //Example 1
> +
> +    display-controller {
> +      compatible = "atmel,hlcdc-display-controller";
> +      pinctrl-names = "default";
> +      pinctrl-0 = <&pinctrl_lcd_base &pinctrl_lcd_rgb888>;
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      port@0 {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        reg = <0>;
> +
> +        hlcdc_panel_output: endpoint@0 {
> +          reg = <0>;
> +          remote-endpoint = <&panel_input>;
> +        };
> +      };
> +    };
> +
> +  - |
> +    //Example 2 With a video interface override to force rgb565, bus-width=16
> +
> +    display-controller {
> +      compatible = "atmel,hlcdc-display-controller";
> +      pinctrl-names = "default";
> +      pinctrl-0 = <&pinctrl_lcd_base &pinctrl_lcd_rgb565>;
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      port@0 {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        reg = <0>;

Should be a newline here before the child node.

Cheers,
Conor.

> +        hlcdc_panel_output2: endpoint@0 {
> +          reg = <0>;
> +          remote-endpoint = <&panel_input>;
> +          bus-width = <16>;
> +        };
> +      };
> +    };
> diff --git a/Documentation/devicetree/bindings/display/atmel/hlcdc-dc.txt b/Documentation/devicetree/bindings/display/atmel/hlcdc-dc.txt
> deleted file mode 100644
> index 923aea25344c..000000000000
> --- a/Documentation/devicetree/bindings/display/atmel/hlcdc-dc.txt
> +++ /dev/null
> @@ -1,75 +0,0 @@
> -Device-Tree bindings for Atmel's HLCDC (High LCD Controller) DRM driver
> -
> -The Atmel HLCDC Display Controller is subdevice of the HLCDC MFD device.
> -See ../../mfd/atmel-hlcdc.txt for more details.
> -
> -Required properties:
> - - compatible: value should be "atmel,hlcdc-display-controller"
> - - pinctrl-names: the pin control state names. Should contain "default".
> - - pinctrl-0: should contain the default pinctrl states.
> - - #address-cells: should be set to 1.
> - - #size-cells: should be set to 0.
> -
> -Required children nodes:
> - Children nodes are encoding available output ports and their connections
> - to external devices using the OF graph representation (see ../graph.txt).
> - At least one port node is required.
> -
> -Optional properties in grandchild nodes:
> - Any endpoint grandchild node may specify a desired video interface
> - according to ../../media/video-interfaces.txt, specifically
> - - bus-width: recognized values are <12>, <16>, <18> and <24>, and
> -   override any output mode selection heuristic, forcing "rgb444",
> -   "rgb565", "rgb666" and "rgb888" respectively.
> -
> -Example:
> -
> -	hlcdc: hlcdc@f0030000 {
> -		compatible = "atmel,sama5d3-hlcdc";
> -		reg = <0xf0030000 0x2000>;
> -		interrupts = <36 IRQ_TYPE_LEVEL_HIGH 0>;
> -		clocks = <&lcdc_clk>, <&lcdck>, <&clk32k>;
> -		clock-names = "periph_clk","sys_clk", "slow_clk";
> -
> -		hlcdc-display-controller {
> -			compatible = "atmel,hlcdc-display-controller";
> -			pinctrl-names = "default";
> -			pinctrl-0 = <&pinctrl_lcd_base &pinctrl_lcd_rgb888>;
> -			#address-cells = <1>;
> -			#size-cells = <0>;
> -
> -			port@0 {
> -				#address-cells = <1>;
> -				#size-cells = <0>;
> -				reg = <0>;
> -
> -				hlcdc_panel_output: endpoint@0 {
> -					reg = <0>;
> -					remote-endpoint = <&panel_input>;
> -				};
> -			};
> -		};
> -
> -		hlcdc_pwm: hlcdc-pwm {
> -			compatible = "atmel,hlcdc-pwm";
> -			pinctrl-names = "default";
> -			pinctrl-0 = <&pinctrl_lcd_pwm>;
> -			#pwm-cells = <3>;
> -		};
> -	};
> -
> -Example 2: With a video interface override to force rgb565; as above
> -but with these changes/additions:
> -
> -	&hlcdc {
> -		hlcdc-display-controller {
> -			pinctrl-names = "default";
> -			pinctrl-0 = <&pinctrl_lcd_base &pinctrl_lcd_rgb565>;
> -
> -			port@0 {
> -				hlcdc_panel_output: endpoint@0 {
> -					bus-width = <16>;
> -				};
> -			};
> -		};
> -	};
> -- 
> 2.25.1
> 

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