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Date:   Fri, 1 May 2020 15:26:07 -0500
From:   Rob Herring <robh@...nel.org>
To:     Adrian Ratiu <adrian.ratiu@...labora.com>
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-rockchip@...ts.infradead.org,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Heiko Stuebner <heiko@...ech.de>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-imx@....com,
        kernel@...labora.com, linux-stm32@...md-mailman.stormreply.com,
        Neil Armstrong <narmstrong@...libre.com>,
        Fabio Estevam <festevam@...il.com>,
        Adrian Pop <pop.adrian61@...il.com>,
        Arnaud Ferraris <arnaud.ferraris@...labora.com>,
        Sjoerd Simons <sjoerd.simons@...labora.com>,
        Martyn Welch <martyn.welch@...labora.com>
Subject: Re: [PATCH v8 07/10] dt-bindings: display: add i.MX6 MIPI DSI host
 controller doc

On Mon, Apr 27, 2020 at 11:19:49AM +0300, Adrian Ratiu wrote:
> This provides an example DT binding for the MIPI DSI host controller
> present on the i.MX6 SoC based on Synopsis DesignWare v1.01 IP.
> 
> Cc: Rob Herring <robh@...nel.org>
> Cc: Neil Armstrong <narmstrong@...libre.com>
> Cc: Fabio Estevam <festevam@...il.com>
> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Cc: devicetree@...r.kernel.org
> Tested-by: Adrian Pop <pop.adrian61@...il.com>
> Tested-by: Arnaud Ferraris <arnaud.ferraris@...labora.com>
> Signed-off-by: Sjoerd Simons <sjoerd.simons@...labora.com>
> Signed-off-by: Martyn Welch <martyn.welch@...labora.com>
> Signed-off-by: Adrian Ratiu <adrian.ratiu@...labora.com>
> ---
> Changes since v7:
>   - Clarified port@0,1 descriptions, marked them as required and
>   added missing port@0 in example (Laurent)
> 
> Changes since v6:
>   - Added ref to the newly created snps,dw-mipi-dsi.yaml (Laurent)
>   - Moved *-cells properties outside patternProperties (Laurent)
>   - Removed the panel port documentation (Laurent)
>   - Wrapped lines at 80 chars, typo fixes, sort includes (Laurent)
> 
> Changes since v5:
>   - Fixed missing reg warning (Fabio)
>   - Updated dt-schema and fixed warnings (Rob)
> 
> Changes since v4:
>   - Fixed yaml binding to pass `make dt_binding_check dtbs_check`
>   and addressed received binding feedback (Rob)
> 
> Changes since v3:
>   - Added commit message (Neil)
>   - Converted to yaml format (Neil)
>   - Minor dt node + driver fixes (Rob)
>   - Added small panel example to the host controller binding
> 
> Changes since v2:
>   - Fixed commit tags (Emil)
> ---
>  .../display/imx/fsl,mipi-dsi-imx6.yaml        | 145 ++++++++++++++++++
>  1 file changed, 145 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,mipi-dsi-imx6.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/imx/fsl,mipi-dsi-imx6.yaml b/Documentation/devicetree/bindings/display/imx/fsl,mipi-dsi-imx6.yaml
> new file mode 100644
> index 0000000000000..c2c3489e63fa3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/imx/fsl,mipi-dsi-imx6.yaml
> @@ -0,0 +1,145 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/imx/fsl,mipi-dsi-imx6.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Freescale i.MX6 DW MIPI DSI Host Controller
> +
> +maintainers:
> +  - Adrian Ratiu <adrian.ratiu@...labora.com>
> +
> +description: |
> +  The i.MX6 DSI host controller is a Synopsys DesignWare MIPI DSI v1.01
> +  IP block with a companion PHY IP.
> +
> +  These DT bindings follow the Synopsys DW MIPI DSI bindings defined in
> +  Documentation/devicetree/bindings/display/bridge/dw_mipi_dsi.txt with
> +  the following device-specific properties.
> +
> +allOf:
> +  - $ref: ../bridge/snps,dw-mipi-dsi.yaml#
> +
> +properties:
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 0
> +
> +  compatible:
> +    items:
> +      - const: fsl,imx6q-mipi-dsi
> +      - const: snps,dw-mipi-dsi

This schema is going to be applied on any node with 'snps,dw-mipi-dsi'. 
You'll need a custom 'select' with only 'fsl,imx6q-mipi-dsi'. There's a 
few examples in the tree.

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: Module Clock
> +      - description: DSI bus clock
> +
> +  clock-names:
> +    items:
> +      - const: ref
> +      - const: pclk
> +
> +  fsl,gpr:
> +    description:
> +      Phandle to the iomuxc-gpr region containing the multiplexer ctrl register.
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +
> +  ports:
> +    type: object
> +    description: |
> +      A node containing DSI input & output port nodes with endpoint
> +      definitions as documented in
> +      Documentation/devicetree/bindings/media/video-interfaces.txt
> +      Documentation/devicetree/bindings/graph.txt
> +    properties:
> +      port@0:
> +        type: object
> +        description:
> +          DSI input port connected to a parallel RGB LTDC output port.
> +
> +      port@1:
> +        type: object
> +        description:
> +          DSI serial RGB output port connected to a panel or bridge input port.
> +
> +    required:
> +      - port@0
> +      - port@1
> +
> +additionalProperties: false

When including other schemas, you need 'unevalatedProperties: false' 
instead. Then you can drop anything here that doesn't have more 
constraints like the next property:

> +
> +patternProperties:
> +  "^panel@[0-3]$":
> +    type: object
> +
> +required:
> +  - "#address-cells"
> +  - "#size-cells"
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +  - ports
> +
> +examples:
> +  - |+
> +    #include <dt-bindings/clock/imx6qdl-clock.h>
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    dsi: dsi@...0000 {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        compatible = "fsl,imx6q-mipi-dsi", "snps,dw-mipi-dsi";
> +        reg = <0x021e0000 0x4000>;
> +        interrupts = <0 102 IRQ_TYPE_LEVEL_HIGH>;
> +        fsl,gpr = <&gpr>;
> +        clocks = <&clks IMX6QDL_CLK_MIPI_CORE_CFG>,
> +                 <&clks IMX6QDL_CLK_MIPI_IPG>;
> +        clock-names = "ref", "pclk";
> +
> +        ports {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +            port@0 {
> +                reg = <0>;
> +                mipi_mux_0: endpoint {
> +                    remote-endpoint = <&ipu1_di0_mipi>;
> +                };
> +            };
> +            port@1 {
> +                reg = <1>;
> +                dsi_out: endpoint {
> +                    remote-endpoint = <&panel_in>;
> +                };
> +            };
> +        };
> +
> +        panel@0 {
> +            compatible = "sharp,ls032b3sx01";
> +            reg = <0>;
> +            reset-gpios = <&gpio6 8 GPIO_ACTIVE_LOW>;
> +            ports {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +                port@0 {
> +                    reg = <0>;
> +                    panel_in: endpoint {
> +                        remote-endpoint = <&dsi_out>;
> +                    };
> +                };
> +            };
> +        };
> +    };
> +
> +...
> -- 
> 2.26.0
> 

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