Re: [PATCH v3 1/2] dt-bindings: display: bridge: ldb: Implement simple NXP i.MX8MP LDB bridge

[Rob Herring <robh@kernel.org>]

On Sat, Apr 23, 2022 at 04:16:24AM +0200, Marek Vasut wrote:
> The i.MX8MP contains two syscon registers which are responsible
> for configuring the on-SoC DPI-to-LVDS serializer. Add DT binding
> which represents this serializer as a bridge.
> 
> Acked-by: Sam Ravnborg <sam@ravnborg.org>
> Signed-off-by: Marek Vasut <marex@denx.de>
> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Cc: Lucas Stach <l.stach@pengutronix.de>
> Cc: Maxime Ripard <maxime@cerno.tech>
> Cc: Peng Fan <peng.fan@nxp.com>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Robby Cai <robby.cai@nxp.com>
> Cc: Robert Foss <robert.foss@linaro.org>
> Cc: Sam Ravnborg <sam@ravnborg.org>
> Cc: Thomas Zimmermann <tzimmermann@suse.de>
> Cc: devicetree@vger.kernel.org
> To: dri-devel@lists.freedesktop.org
> ---
> V2: - Consistently use fsl,imx8mp-ldb as compatible
>     - Drop items: from compatible:
>     - Replace minItems with maxItems in clocks:
>     - Drop quotes from clock-names const: ldb
>     - Rename syscon to fsl,syscon
>     - Use generic name of ldb-lvds in example
> V3: - Add AB from Sam
>     - Consistently use MX8MP
> ---
>  .../bindings/display/bridge/nxp,ldb.yaml      | 96 +++++++++++++++++++
>  1 file changed, 96 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/nxp,ldb.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/nxp,ldb.yaml b/Documentation/devicetree/bindings/display/bridge/nxp,ldb.yaml
> new file mode 100644
> index 000000000000..9c1807f2ae43
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/nxp,ldb.yaml
> @@ -0,0 +1,96 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/bridge/nxp,ldb.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NXP i.MX8MP DPI to LVDS bridge chip
> +
> +maintainers:
> +  - Marek Vasut <marex@denx.de>
> +
> +description: |
> +  The i.MX8MP contains two syscon registers which are responsible
> +  for configuring the on-SoC DPI-to-LVDS serializer. This describes
> +  those registers as bridge within the DT.
> +
> +properties:
> +  compatible:
> +    const: fsl,imx8mp-ldb
> +
> +  clocks:
> +    maxItems: 1
> +
> +  clock-names:
> +    const: ldb
> +
> +  fsl,syscon:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: A phandle to media block controller.
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: Video port for DPI input.
> +
> +      port@1:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: Video port for LVDS Channel-A output (panel or bridge).
> +
> +      port@2:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: Video port for LVDS Channel-B output (panel or bridge).
> +
> +    required:
> +      - port@0
> +      - port@1
> +
> +required:
> +  - compatible
> +  - clocks
> +  - fsl,syscon
> +  - ports
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/imx8mp-clock.h>
> +
> +    bridge {
> +        compatible = "fsl,imx8mp-ldb";
> +        clocks = <&clk IMX8MP_CLK_MEDIA_LDB>;
> +        clock-names = "ldb";
> +        fsl,syscon = <&media_blk_ctrl>;

This binding should be a child of &media_blk_ctrl. And then do away with 
this property.

> +
> +        ports {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            port@0 {
> +                reg = <0>;
> +
> +                ldb_from_lcdif2: endpoint {
> +                    remote-endpoint = <&lcdif2_to_ldb>;
> +                };
> +            };
> +
> +            port@1 {
> +                reg = <1>;
> +
> +                ldb_lvds_ch0: endpoint {
> +                    remote-endpoint = <&ldb_to_lvdsx4panel>;
> +                };
> +            };
> +
> +            port@2 {
> +                reg = <2>;
> +
> +                ldb_lvds_ch1: endpoint {
> +                };
> +            };
> +        };
> +    };
> -- 
> 2.35.1
> 
>