Re: [PATCH v4 4/4] dt-bindings: display: add i.MX6 MIPI DSI host controller doc

[Rob Herring <robh@kernel.org>]

On Mon, Dec 02, 2019 at 09:33:59PM +0200, 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@kernel.org>
> Cc: Neil Armstrong <narmstrong@baylibre.com>
> Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.com>
> Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
> Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
> ---
>  .../display/imx/fsl,mipi-dsi-imx6.yaml        | 136 ++++++++++++++++++
>  1 file changed, 136 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,mipi-dsi-imx6.yaml

Run 'make dt_binding_check' and fix the errors. See 
Documentation/devicetree/writing-schema.rst.

> 
> 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 000000000000..8c9603c28240
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/imx/fsl,mipi-dsi-imx6.yaml
> @@ -0,0 +1,136 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/fsl,mipi-dsi-imx6.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Freescale i.MX6 DW MIPI DSI Host Controller
> +
> +description:
> +  The DSI host controller is a Synopsys DesignWare MIPI DSI v1.01 IP 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.
> +
> +properties:
> +  compatible:
> +    const: [ "fsl,imx6q-mipi-dsi", "snps,dw-mipi-dsi" ]

Not valid json-schema. You want 'items' with 2 'const' entries.
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: Module Clock
> +      - description: DSI bus clock
> +    minItems: 2
> +    maxItems: 2

Don't need these. The min/max is implied by length of 'items'.

> +
> +  clock-names:
> +    items:
> +      - const: pclk
> +      - const: ref
> +    minItems: 2
> +    maxItems: 2
> +
> +  fsl,gpr:
> +    description: Phandle to the iomuxc-gpr region containing the multiplexer control register.
> +    const: *gpr

Not a const. Should be a phandle type.

> +
> +  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 node, connected to the ltdc rgb output port.
> +
> +      port@1:
> +        type: object
> +        description:
> +          DSI output port node, connected to a panel or a bridge input port"
> +
> +patternProperties:
> +  "^(panel|panel-dsi)@[0-9]$":

DSI virtual channels are 0-3 only.

Do you really need both node names?

> +    type: object
> +    description:
> +      A node containing the panel or bridge description as documented in
> +      Documentation/devicetree/bindings/display/mipi-dsi-bus.txt
> +    properties:
> +      port:
> +        type: object
> +        description:
> +          Panel or bridge port node, connected to the DSI output port (port@1)
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +required:
> +  - "#address-cells"
> +  - "#size-cells"
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +  - ports
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    dsi: dsi@21e0000 {
> +        #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 {
> +            port@0 {
> +                reg = <0>;
> +                dsi_in: endpoint {
> +                    remote-endpoint = <&ltdc_ep1_out>;
> +                };
> +            };
> +
> +            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 {
> +                port@0 {
> +                    panel_in: endpoint {
> +                        remote-endpoint = <&dsi_out>;
> +                    };
> +                };
> +            };
> +        };
> +    };
> +
> +...
> -- 
> 2.24.0
>