linux-kernel - Re: [PATCH v2 1/2] Documentation: bindings: Add ANX7688 HDMI to DP bridge binding

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Date:   Wed, 19 Feb 2020 09:30:19 -0600
From:   Rob Herring <robh@...nel.org>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     linux-kernel@...r.kernel.org,
        Collabora Kernel ML <kernel@...labora.com>,
        Andrzej Hajda <a.hajda@...sung.com>, matthias.bgg@...il.com,
        drinkcat@...omium.org, hsinyi@...omium.org,
        Neil Armstrong <narmstrong@...libre.com>,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        David Airlie <airlied@...ux.ie>,
        Mark Rutland <mark.rutland@....com>,
        Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH v2 1/2] Documentation: bindings: Add ANX7688 HDMI to DP
 bridge binding

On Thu, Feb 13, 2020 at 03:54:15PM +0100, Enric Balletbo i Serra wrote:
> From: Nicolas Boichat <drinkcat@...omium.org>

'dt-bindings: ....' for the subject please.

> 
> Add documentation for DT properties supported by anx7688 HDMI-DP
> converter.
> 
> Signed-off-by: Nicolas Boichat <drinkcat@...omium.org>
> Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> ---
> 
> Changes in v2:
> - Improve a bit the descriptions using the info from the datasheet.
> - Convert binding to yaml.
> - Use dual licensing.
> 
>  .../bindings/display/bridge/anx7688.yaml      | 79 +++++++++++++++++++

Use the full compatible string: analogix,anx7688.yaml

>  1 file changed, 79 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/anx7688.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/anx7688.yaml b/Documentation/devicetree/bindings/display/bridge/anx7688.yaml
> new file mode 100644
> index 000000000000..c1b4b5191d44
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/anx7688.yaml
> @@ -0,0 +1,79 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/bridge/anx7688.yaml#

Don't forget to update this too.

> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analogix ANX7688 HDMI to USB Type-C Bridge (Port Controller with MUX)
> +
> +maintainers:
> +  - Nicolas Boichat <drinkcat@...omium.org>
> +  - Enric Balletbo i Serra <enric.balletbo@...labora.com>
> +
> +description: |
> +  The ANX7688 is a single-chip mobile transmitter to support 4K 60 frames per
> +  second (4096x2160p60) or FHD 120 frames per second (1920x1080p120) video
> +  resolution from a smartphone or tablet with full function USB-C.
> +
> +  This binding only describes the HDMI to DP display bridge.
> +
> +properties:
> +  compatible:
> +    const: analogix,anx7688
> +
> +  reg:
> +    maxItems: 1
> +    description: I2C address of the device

That's every reg, you can drop 'description'.

> +
> +  ports:
> +    type: object
> +
> +    properties:
> +      port@0:
> +        type: object
> +        description: |
> +          Video port for HDMI input
> +
> +      port@1:
> +        type: object
> +        description: |
> +          Video port for DP output
> +
> +    required:
> +      - port@0

IMO, port@1 should be required too. If not a fixed panel, then it should 
have a connector node.

> +
> +required:
> +  - compatible
> +  - reg
> +  - ports
> +
> +examples:
> +  - |
> +    i2c0 {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        anx7688: dp-bridge@2c {
> +            compatible = "analogix,anx7688";
> +            reg = <0x2c>;
> +
> +            ports {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +
> +                port@0 {
> +                    reg = <0>;
> +                    anx7866_in: endpoint {
> +                        remote-endpoint = <&hdmi0_out>;
> +                    };
> +                };
> +
> +                port@1 {
> +                    reg = <1>;
> +                    anx7866_out: endpoint {
> +                        remote-endpoint = <&panel_in>;
> +                   };
> +                };
> +            };
> +        };
> +    };
> -- 
> 2.25.0
>