Re: [PATCH v2 2/4] dt-bindings: display: bridge: Repurpose lvds-encoder

[Rob Herring <robh+dt@xxxxxxxxxx>]

On Mon, Nov 4, 2019 at 10:58 AM Fabrizio Castro
<fabrizio.castro@xxxxxxxxxxxxxx> wrote:
>
> In an effort to repurpose lvds-encoder.c to also serve the
> function of LVDS decoders, we ended up defining a new "generic"
> compatible string, therefore adapt the dt-bindings to fit the
> new purpose. Also, convert the dt-bindings from .txt to .yaml
> while at it.

"Also, ... while at it." is a sign for split into 2 patches.

> Signed-off-by: Fabrizio Castro <fabrizio.castro@xxxxxxxxxxxxxx>
>
> ---
> v1->v2:
> * Converted to dt-schema as per Neil's comment
> ---
>  .../bindings/display/bridge/lvds-codec.yaml        | 117 +++++++++++++++++++++
>  .../bindings/display/bridge/lvds-transmitter.txt   |  66 ------------
>  2 files changed, 117 insertions(+), 66 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/lvds-codec.yaml
>  delete mode 100644 Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt
>
> diff --git a/Documentation/devicetree/bindings/display/bridge/lvds-codec.yaml b/Documentation/devicetree/bindings/display/bridge/lvds-codec.yaml
> new file mode 100644
> index 0000000..ff79bc2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/lvds-codec.yaml
> @@ -0,0 +1,117 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/bridge/lvds-codec.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Trasnparent LVDS encoders and LVDS decoders

Typo

> +
> +maintainers:
> +  - Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
> +
> +description: |
> +  This binding supports transparent LVDS encoders and LVDS decoders that don't
> +  require any configuration.
> +
> +  LVDS is a physical layer specification defined in ANSI/TIA/EIA-644-A. Multiple
> +  incompatible data link layers have been used over time to transmit image data
> +  to LVDS panels. This binding targets devices compatible with the following
> +  specifications only.
> +
> +  [JEIDA] "Digital Interface Standards for Monitor", JEIDA-59-1999, February
> +  1999 (Version 1.0), Japan Electronic Industry Development Association (JEIDA)
> +  [LDI] "Open LVDS Display Interface", May 1999 (Version 0.95), National
> +  Semiconductor
> +  [VESA] "VESA Notebook Panel Standard", October 2007 (Version 1.0), Video
> +  Electronics Standards Association (VESA)
> +
> +  Those devices have been marketed under the FPD-Link and FlatLink brand names
> +  among others.
> +
> +properties:
> +  compatible:
> +    description: |
> +      Any encoder or decoder compatible with this generic binding, but with
> +      additional properties not listed here, must define its own binding and
> +      list a device specific compatible first followed by the generic compatible
> +    items:
> +      - enum:

You can drop 'items' when there's only 1.

> +        - lvds-encoder # for LVDS encoders
> +        - lvds-decoder # for LVDS decoders
> +
> +  ports:
> +    type: object
> +    description: |
> +      This device has two video ports. Their connections are modeled using the
> +      OF graph bindings specified in Documentation/devicetree/bindings/graph.txt
> +    properties:
> +      port@0:
> +        type: object
> +        description: |
> +          With LVDS encoders port 0 is for parallel input
> +          With LVDS decoders port 0 is for LVDS input
> +
> +      port@1:
> +        type: object
> +        description: |
> +          With LVDS encoders port 1 is for LVDS output
> +          With LVDS decoders port 1 is for parallel output

port@* are required, right?

> +
> +required:
> +  - compatible
> +  - ports
> +
> +examples:
> +  - |
> +    lvds-encoder {
> +      compatible = "lvds-encoder";
> +
> +      ports {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        port@0 {
> +          reg = <0>;
> +
> +          lvds_enc_in: endpoint {
> +            remote-endpoint = <&display_out_rgb>;
> +          };
> +        };
> +
> +        port@1 {
> +          reg = <1>;
> +
> +          lvds_enc_out: endpoint {
> +            remote-endpoint = <&lvds_panel_in>;
> +          };
> +        };
> +      };
> +    };
> +
> +  - |
> +    lvds-decoder {
> +      compatible = "lvds-decoder";
> +
> +      ports {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        port@0 {
> +          reg = <0>;
> +
> +          lvds_dec_in: endpoint {
> +            remote-endpoint = <&display_out_lvds>;
> +          };
> +        };
> +
> +        port@1 {
> +          reg = <1>;
> +
> +          lvds_dec_out: endpoint {
> +            remote-endpoint = <&rgb_panel_in>;
> +          };
> +        };
> +      };
> +    };
> +
> +...