linux-kernel - Re: [PATCH v4 6/7] dt-bindings: Add ANX6345 DP/eDP transmitter binding

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Date:   Thu, 31 Oct 2019 13:51:00 +0100
From:   Maxime Ripard <mripard@...nel.org>
To:     Torsten Duwe <duwe@....de>
Cc:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Icenowy Zheng <icenowy@...c.io>,
        Sean Paul <seanpaul@...omium.org>,
        Vasily Khoruzhick <anarsoul@...il.com>,
        Harald Geyer <harald@...ib.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 6/7] dt-bindings: Add ANX6345 DP/eDP transmitter
 binding

On Tue, Oct 29, 2019 at 01:16:57PM +0100, Torsten Duwe wrote:
> The anx6345 is an ultra-low power DisplayPort/eDP transmitter designed
> for portable devices.
>
> Add a binding document for it.
>
> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> Signed-off-by: Vasily Khoruzhick <anarsoul@...il.com>
> Reviewed-by: Rob Herring <robh@...nel.org>
> Signed-off-by: Torsten Duwe <duwe@...e.de>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> ---
>  .../bindings/display/bridge/anx6345.yaml           | 92 ++++++++++++++++++++++
>  1 file changed, 92 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/anx6345.yaml
>
> diff --git a/Documentation/devicetree/bindings/display/bridge/anx6345.yaml b/Documentation/devicetree/bindings/display/bridge/anx6345.yaml
> new file mode 100644
> index 000000000000..094e8e8a5faa
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/anx6345.yaml
> @@ -0,0 +1,92 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/bridge/anx6345.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analogix ANX6345 eDP Transmitter Device Tree Bindings
> +
> +maintainers:
> +  - Torsten Duwe <duwe@....de>
> +
> +description: |
> +  The ANX6345 is an ultra-low power Full-HD eDP transmitter designed for
> +  portable devices.
> +
> +properties:
> +  compatible:
> +    const: analogix,anx6345
> +
> +  reg:
> +    maxItems: 1
> +    description: base I2C address of the device
> +
> +  reset-gpios:
> +    maxItems: 1
> +    description: GPIO connected to active low reset
> +
> +  dvdd12-supply:
> +    maxItems: 1
> +    description: Regulator for 1.2V digital core power.
> +
> +  dvdd25-supply:
> +    maxItems: 1
> +    description: Regulator for 2.5V digital core power.
> +
> +  ports:
> +    anyOf:
> +      - port@0:
> +        description: Video port for LVTTL input
> +      - port@1:
> +        description: Video port for eDP output (panel or connector).
> +                     May be omitted if EDID works reliably.
> +    required:
> +      - port@0

Have you tried to validate those two ports in a DT?

I'm not quite sure what you wanted to express with that anyOf, but if
it was something like port@0 is mandatory, and port@1 is optional, it
should be something like this:

properties:

  ...

  ports:
    type: object

    properties:
      port@0:
        type: object
        description: |
	  Video port for LVTTL input

      port@1:
        type: object
        description: |
	  Video port for eDP output (..)

    required:
      - port@0

This way, you express that both port@0 and port@1 must by nodes, under
a node called ports, and port@0 is mandatory.

You should even push this a bit further by adding
additionalProperties: false to prevent a DT from having undocumented
properties and children for the main node and ports node.

Maxime

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