Re: [PATCH 1/4] dt-bindings: display: bridge: add sam9x75-mipi-dsi binding

[Krzysztof Kozlowski <krzk@xxxxxxxxxx>]

On 04/07/2024 10:48, Manikandan Muralidharan wrote:
> Add the 'sam9x75-mipi-dsi' compatible binding, which describes the
> Microchip's specific wrapper for the Synopsys DesignWare MIPI DSI HOST
> Controller for the sam9x75 series System-on-Chip (SoC) devices.
> 
> Signed-off-by: Manikandan Muralidharan <manikandan.m@xxxxxxxxxxxxx>
> ---
>  .../bridge/microchip,sam9x75-mipi-dsi.yaml    | 135 ++++++++++++++++++
>  1 file changed, 135 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/microchip,sam9x75-mipi-dsi.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/microchip,sam9x75-mipi-dsi.yaml b/Documentation/devicetree/bindings/display/bridge/microchip,sam9x75-mipi-dsi.yaml
> new file mode 100644
> index 000000000000..87aaf9c929e9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/microchip,sam9x75-mipi-dsi.yaml
> @@ -0,0 +1,135 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/bridge/microchip,sam9x75-mipi-dsi.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip SAM9X75 MIPI DSI Controller
> +
> +maintainers:
> +  - Manikandan Muralidharan <manikandan.m@xxxxxxxxxxxxx>
> +
> +description:
> +  Microchip specific extensions or wrapper to the Synopsys Designware MIPI DSI.
> +  The MIPI Display Serial Interface (DSI) Host Controller implements all
> +  protocol functions defined in the MIPI DSI Specification. The DSI Host
> +  provides an interface between the LCD Controller (LCDC) and the MIPI D-PHY,
> +  allowing communication with a DSI-compliant display.
> +
> +allOf:
> +  - $ref: /schemas/display/dsi-controller.yaml#
> +
> +properties:
> +  compatible:
> +    const: microchip,sam9x75-mipi-dsi
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    description:
> +      MIPI DSI must have two clocks to function correctly.Peripheral clock
> +      'pclk' for the hardware block functionality and Generic clock 'refclk' to
> +      drive the D-PHY PLL block.

List the clocks with description instead of writing it in free-form text.

> +    minItems: 2

Drop, three clocks would not be correct anyway, right?

> +
> +  clock-names:
> +    items:
> +      - const: pclk
> +      - const: refclk
> +
> +  microchip,sfr:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      phandle to Special Function Register (SFR) node.To enable the DSI/CSI

Everywhere: there is always a space after full stop.

> +      selection bit in SFR's ISS Configuration Register.
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/$defs/port-base
> +        unevaluatedProperties: false
> +        description:
> +          DSI Input port node, connected to the LCDC RGB output port.
> +
> +        properties:
> +          endpoint:
> +            $ref: /schemas/media/video-interfaces.yaml#
> +            unevaluatedProperties: false
> +            properties:
> +              remote-endpoint: true

Why do you need it?

No constraints on data-lanes or frequencies?

> +
> +      port@1:
> +        $ref: /schemas/graph.yaml#/$defs/port-base
> +        unevaluatedProperties: false
> +        description:
> +          DSI Output port node, connected to a panel or a bridge input port.
> +
> +        properties:
> +          endpoint:
> +            $ref: /schemas/media/video-interfaces.yaml#
> +            unevaluatedProperties: false
> +            properties:
> +              remote-endpoint: true
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - ports
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/at91.h>
> +    #include <dt-bindings/gpio/gpio.h>
> +
> +    dsi: dsi@f8054000 {

Drop unused label.

> +         compatible = "microchip,sam9x75-mipi-dsi";
> +         reg = <0xf8054000 0x200>;
> +         clocks = <&pmc PMC_TYPE_PERIPHERAL 54>, <&pmc PMC_TYPE_GCK 55>;
> +         clock-names = "pclk", "refclk";
> +         microchip,sfr = <&sfr>;
> +
> +         #address-cells = <1>;
> +         #size-cells = <0>;
> +
> +         ports {
> +                #address-cells = <1>;

Messed indentation, everywhere in the example...

Use 4 spaces for example indentation.

> +                #size-cells = <0>;
> +
> +                port@0 {
> +                        reg = <0>;
> +                        dsi_in: endpoint {
> +                            remote-endpoint = <&hlcdc_panel_output>;
> +                        };
> +                };
> +
> +                port@1 {
> +                        reg = <1>;
> +                        dsi_out: endpoint {
> +                            remote-endpoint = <&mipi_in_panel>;
> +                        };
> +                };
> +         };
> +
> +         panel@0 {

Drop the node, not related.

Best regards,
Krzysztof