Re: [PATCH v4 08/14] dt-bindings: display: bridge: Add i.MX8qxp pixel link to DPI binding

[Rob Herring <robh@kernel.org>]

On Thu, Feb 18, 2021 at 11:41:49AM +0800, Liu Ying wrote:
> This patch adds bindings for i.MX8qxp pixel link to DPI(PXL2DPI).
> 
> Signed-off-by: Liu Ying <victor.liu@nxp.com>
> ---
> v3->v4:
> * Add 'fsl,sc-resource' property. (Rob)
> 
> v2->v3:
> * Drop 'fsl,syscon' property. (Rob)
> * Mention the CSR module controls PXL2DPI.
> 
> v1->v2:
> * Use graph schema. (Laurent)
> 
>  .../display/bridge/fsl,imx8qxp-pxl2dpi.yaml        | 108 +++++++++++++++++++++
>  1 file changed, 108 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-pxl2dpi.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-pxl2dpi.yaml b/Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-pxl2dpi.yaml
> new file mode 100644
> index 00000000..e4e77fa
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-pxl2dpi.yaml
> @@ -0,0 +1,108 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/bridge/fsl,imx8qxp-pxl2dpi.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Freescale i.MX8qxp Pixel Link to Display Pixel Interface
> +
> +maintainers:
> +  - Liu Ying <victor.liu@nxp.com>
> +
> +description: |
> +  The Freescale i.MX8qxp Pixel Link to Display Pixel Interface(PXL2DPI)
> +  interfaces the pixel link 36-bit data output and the DSI controller’s
> +  MIPI-DPI 24-bit data input, and inputs of LVDS Display Bridge(LDB) module
> +  used in LVDS mode, to remap the pixel color codings between those modules.
> +  This module is purely combinatorial.
> +
> +  The i.MX8qxp PXL2DPI is controlled by Control and Status Registers(CSR) module.
> +  The CSR module, as a system controller, contains the PXL2DPI's configuration
> +  register.

So this node should be a child of the CSR. Ideally, this schema is also 
referenced from the CSR's schema (and if that doesn't exist, it should 
be there first).

> +
> +properties:
> +  compatible:
> +    const: fsl,imx8qxp-pxl2dpi
> +
> +  fsl,sc-resource:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: The SCU resource ID associated with this PXL2DPI instance.
> +
> +  power-domains:
> +    maxItems: 1
> +
> +  fsl,companion-pxl2dpi:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: |
> +      A phandle which points to companion PXL2DPI which is used by downstream
> +      LVDS Display Bridge(LDB) in split mode.
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: The PXL2DPI input port node from pixel link.
> +
> +      port@1:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: The PXL2DPI output port node to downstream bridge.
> +
> +    required:
> +      - port@0
> +      - port@1
> +
> +required:
> +  - compatible
> +  - fsl,sc-resource
> +  - power-domains
> +  - ports
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/firmware/imx/rsrc.h>
> +    pxl2dpi {
> +        compatible = "fsl,imx8qxp-pxl2dpi";
> +        fsl,sc-resource = <IMX_SC_R_MIPI_0>;
> +        power-domains = <&pd IMX_SC_R_MIPI_0>;
> +
> +        ports {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            port@0 {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +                reg = <0>;
> +
> +                mipi_lvds_0_pxl2dpi_dc_pixel_link0: endpoint@0 {
> +                    reg = <0>;
> +                    remote-endpoint = <&dc_pixel_link0_mipi_lvds_0_pxl2dpi>;
> +                };
> +
> +                mipi_lvds_0_pxl2dpi_dc_pixel_link1: endpoint@1 {
> +                     reg = <1>;
> +                     remote-endpoint = <&dc_pixel_link1_mipi_lvds_0_pxl2dpi>;
> +                };
> +            };
> +
> +            port@1 {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +                reg = <1>;
> +
> +                mipi_lvds_0_pxl2dpi_mipi_lvds_0_ldb_ch0: endpoint@0 {
> +                    reg = <0>;
> +                    remote-endpoint = <&mipi_lvds_0_ldb_ch0_mipi_lvds_0_pxl2dpi>;
> +                };
> +
> +                mipi_lvds_0_pxl2dpi_mipi_lvds_0_ldb_ch1: endpoint@1 {
> +                    reg = <1>;
> +                    remote-endpoint = <&mipi_lvds_0_ldb_ch1_mipi_lvds_0_pxl2dpi>;
> +                };
> +            };
> +        };
> +    };
> -- 
> 2.7.4
>