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Date:   Tue, 22 Dec 2020 11:08:06 +0800
From:   Liu Ying <victor.liu@....com>
To:     Rob Herring <robh@...nel.org>
Cc:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, airlied@...ux.ie, daniel@...ll.ch,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, mchehab@...nel.org,
        a.hajda@...sung.com, narmstrong@...libre.com,
        Laurent.pinchart@...asonboard.com, jonas@...boo.se,
        jernej.skrabec@...l.net, kishon@...com, vkoul@...nel.org
Subject: Re: [PATCH 06/14] dt-bindings: display: bridge: Add i.MX8qm/qxp
 display pixel link binding

On Mon, 2020-12-21 at 15:31 -0700, Rob Herring wrote:
> On Thu, Dec 17, 2020 at 05:59:25PM +0800, Liu Ying wrote:
> > This patch adds bindings for i.MX8qm/qxp display pixel link.
> > 
> > Signed-off-by: Liu Ying <victor.liu@....com>
> > ---
> >  .../display/bridge/fsl,imx8qxp-pixel-link.yaml     | 128 +++++++++++++++++++++
> >  1 file changed, 128 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-pixel-link.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-pixel-link.yaml b/Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-pixel-link.yaml
> > new file mode 100644
> > index 00000000..fd24a0e
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/display/bridge/fsl,imx8qxp-pixel-link.yaml
> > @@ -0,0 +1,128 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevicetree.org%2Fschemas%2Fdisplay%2Fbridge%2Ffsl%2Cimx8qxp-pixel-link.yaml%23&amp;data=04%7C01%7Cvictor.liu%40nxp.com%7C2c8f001f28de46450bba08d8a60032d5%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637441867070310997%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=Qg5M4UJqHKJy5W4%2FB2hOpeEu8mHtp8rXcyN35TCUukw%3D&amp;reserved=0
> > +$schema: https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevicetree.org%2Fmeta-schemas%2Fcore.yaml%23&amp;data=04%7C01%7Cvictor.liu%40nxp.com%7C2c8f001f28de46450bba08d8a60032d5%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637441867070310997%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=Zjvx9NBDFvqBxXqJItSP6smPdWsQUFYssJpNyVr48uE%3D&amp;reserved=0
> > +
> > +title: Freescale i.MX8qm/qxp Display Pixel Link
> > +
> > +maintainers:
> > +  - Liu Ying <victor.liu@....com>
> > +
> > +description: |
> > +  The Freescale i.MX8qm/qxp Display Pixel Link(DPL) forms a standard
> > +  asynchronous linkage between pixel sources(display controller or
> > +  camera module) and pixel consumers(imaging or displays).
> > +  It consists of two distinct functions, a pixel transfer function and a
> > +  control interface.  Multiple pixel channels can exist per one control channel.
> > +  This binding documentation is only for pixel links whose pixel sources are
> > +  display controllers.
> 
> Perhaps some information about how this 'device' is accessed because you 
> have no control interface.

The i.MX8qm/qxp Display Pixel Link is controlled by SCU firmare.
Will add the information.

> 
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - fsl,imx8qm-dc-pixel-link
> > +      - fsl,imx8qxp-dc-pixel-link
> > +
> > +  ports:
> > +    type: object
> > +    description: |
> > +      A node containing pixel link input & output port nodes with endpoint
> > +      definitions as documented in
> > +      Documentation/devicetree/bindings/media/video-interfaces.txt
> > +      Documentation/devicetree/bindings/graph.txt
> > +
> > +    properties:
> > +      '#address-cells':
> > +        const: 1
> > +
> > +      '#size-cells':
> > +        const: 0
> > +
> > +      port@0:
> > +        type: object
> > +        description: The pixel link input port node from upstream video source.
> > +
> > +        properties:
> > +          reg:
> > +            const: 0
> > +
> > +        required:
> > +          - reg
> 
> You can drop 'reg' parts.

Will drop the 'required' parts for 'reg'.
Also, will drop the '#address-cells' and '#size-cells' parts if no
objections.

Thanks,
Liu Ying

> 
> > +
> > +    patternProperties:
> > +      "^port@[1-4]$":
> > +        type: object
> > +        description: The pixel link output port node to downstream bridge.
> > +
> > +        properties:
> > +          reg:
> > +            enum: [ 1, 2, 3, 4 ]
> > +
> > +        required:
> > +          - reg
> > +
> > +    required:
> > +      - "#address-cells"
> > +      - "#size-cells"
> > +      - port@0
> > +
> > +    anyOf:
> > +      - required:
> > +          - port@1
> > +      - required:
> > +          - port@2
> > +      - required:
> > +          - port@3
> > +      - required:
> > +          - port@4
> > +
> > +    additionalProperties: false
> > +
> > +required:
> > +  - compatible
> > +  - ports
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    dc0-pixel-link0 {
> > +        compatible = "fsl,imx8qxp-dc-pixel-link";
> > +
> > +        ports {
> > +            #address-cells = <1>;
> > +            #size-cells = <0>;
> > +
> > +            /* from dc0 pixel combiner channel0 */
> > +            port@0 {
> > +                reg = <0>;
> > +
> > +                dc0_pixel_link0_dc0_pixel_combiner_ch0: endpoint {
> > +                    remote-endpoint = <&dc0_pixel_combiner_ch0_dc0_pixel_link0>;
> > +                };
> > +            };
> > +
> > +            /* to PXL2DPIs in MIPI/LVDS combo subsystems */
> > +            port@1 {
> > +                #address-cells = <1>;
> > +                #size-cells = <0>;
> > +                reg = <1>;
> > +
> > +                dc0_pixel_link0_mipi_lvds_0_pxl2dpi: endpoint@0 {
> > +                    reg = <0>;
> > +                    remote-endpoint = <&mipi_lvds_0_pxl2dpi_dc0_pixel_link0>;
> > +                };
> > +
> > +                dc0_pixel_link0_mipi_lvds_1_pxl2dpi: endpoint@1 {
> > +                    reg = <1>;
> > +                    remote-endpoint = <&mipi_lvds_1_pxl2dpi_dc0_pixel_link0>;
> > +                };
> > +            };
> > +
> > +            /* to imaging subsystem */
> > +            port@4 {
> > +                reg = <4>;
> > +            };
> > +        };
> > +    };
> > -- 
> > 2.7.4
> > 

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