linux-kernel - Re: [PATCH v3 1/2] dt-bindings: display: bridge: Add bindings for Chipone ICN6211

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Date:   Mon, 15 Feb 2021 14:17:41 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Jagan Teki <jagan@...rulasolutions.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Sam Ravnborg <sam@...nborg.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-amarula@...rulasolutions.com
Subject: Re: [PATCH v3 1/2] dt-bindings: display: bridge: Add bindings for
 Chipone ICN6211

Hi Jagan,

Thank you for the patch.

On Sun, Feb 14, 2021 at 11:22:10PM +0530, Jagan Teki wrote:
> ICN6211 is MIPI-DSI to RGB Convertor bridge from Chipone.
> 
> It has a flexible configuration of MIPI DSI signal input and
> produce RGB565, RGB666, RGB888 output format.
> 
> Add dt-bingings for it.
> 
> Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
> ---
> Changes for v3:
> - updated to new dt-bindings style
> 
>  .../display/bridge/chipone,icn6211.yaml       | 90 +++++++++++++++++++
>  1 file changed, 90 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/chipone,icn6211.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.yaml b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.yaml
> new file mode 100644
> index 000000000000..13764f13fe46
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/chipone,icn6211.yaml
> @@ -0,0 +1,90 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/bridge/chipone,icn6211.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Chipone ICN6211 MIPI-DSI to RGB Converter bridge
> +
> +maintainers:
> +  - Jagan Teki <jagan@...rulasolutions.com>
> +
> +description: |
> +  ICN6211 is MIPI-DSI to RGB Convertor bridge from chipone.
> +
> +  It has a flexible configuration of MIPI DSI signal input and
> +  produce RGB565, RGB666, RGB888 output format.

How does one select between the output formats ? Should the output
connection option be described in the device tree ?

> +
> +properties:
> +  compatible:
> +    enum:
> +      - chipone,icn6211
> +
> +  reg:
> +    maxItems: 1
> +    description: virtual channel number of a DSI peripheral
> +
> +  reset-gpios:
> +    description: GPIO connected for the reset pin
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description:
> +          Video port for MIPI DSI input
> +
> +      port@1:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description:
> +          Video port for MIPI DPI output (panel or connector).
> +
> +    required:
> +      - port@0
> +      - port@1
> +
> +required:
> +  - compatible
> +  - reg
> +  - reset-gpios
> +  - ports

How about regulators ?

> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +
> +    dsi {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      bridge@0 {
> +        compatible = "chipone,icn6211";
> +        reg = <0>;
> +        reset-gpios = <&r_pio 0 5 GPIO_ACTIVE_HIGH>; /* LCD-RST: PL5 */
> +
> +        ports {
> +          #address-cells = <1>;
> +          #size-cells = <0>;
> +
> +          bridge_in: port@0 {

You can drop this label.

> +            reg = <0>;
> +
> +            bridge_out_dsi: endpoint {

This label should be bridge_in_dsi.

> +              remote-endpoint = <&dsi_out_bridge>;
> +            };
> +          };
> +
> +          bridge_out: port@1 {

You can drop this label too.

> +            reg = <1>;
> +
> +            bridge_out_panel: endpoint {
> +              remote-endpoint = <&panel_out_bridge>;
> +            };
> +          };
> +        };
> +      };
> +    };

-- 
Regards,

Laurent Pinchart