linux-kernel - Re: [PATCH v11 01/10] dt-bindings: mediatek,dp: Add Display Port binding

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Date:   Tue, 14 Jun 2022 14:23:36 -0600
From:   Rob Herring <robh@...nel.org>
To:     Bo-Chen Chen <rex-bc.chen@...iatek.com>
Cc:     chunkuang.hu@...nel.org, p.zabel@...gutronix.de, daniel@...ll.ch,
        krzysztof.kozlowski+dt@...aro.org, mripard@...nel.org,
        tzimmermann@...e.de, matthias.bgg@...il.com, deller@....de,
        airlied@...ux.ie, msp@...libre.com, granquet@...libre.com,
        jitao.shi@...iatek.com, wenst@...omium.org,
        angelogioacchino.delregno@...labora.com, ck.hu@...iatek.com,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-fbdev@...r.kernel.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v11 01/10] dt-bindings: mediatek,dp: Add Display Port
 binding

On Fri, Jun 10, 2022 at 06:55:13PM +0800, Bo-Chen Chen wrote:
> From: Markus Schneider-Pargmann <msp@...libre.com>
> 
> This controller is present on several mediatek hardware. Currently
> mt8195 and mt8395 have this controller without a functional difference,
> so only one compatible field is added.
> 
> The controller can have two forms, as a normal display port and as an
> embedded display port.
> 
> Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
> Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> [Bo-Chen: Fix reviewers' comment]
> Signed-off-by: Bo-Chen Chen <rex-bc.chen@...iatek.com>
> ---
>  .../display/mediatek/mediatek,dp.yaml         | 101 ++++++++++++++++++
>  1 file changed, 101 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/mediatek/mediatek,dp.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,dp.yaml b/Documentation/devicetree/bindings/display/mediatek/mediatek,dp.yaml
> new file mode 100644
> index 000000000000..10f50a0dcf49
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,dp.yaml
> @@ -0,0 +1,101 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/mediatek/mediatek,dp.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek Display Port Controller
> +
> +maintainers:
> +  - Chun-Kuang Hu <chunkuang.hu@...nel.org>
> +  - Jitao shi <jitao.shi@...iatek.com>
> +
> +description: |
> +  Device tree bindings for the MediaTek display port and
> +  embedded display port controller present on some MediaTek SoCs.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - mediatek,mt8195-dp-tx
> +      - mediatek,mt8195-edp-tx
> +
> +  reg:
> +    maxItems: 1
> +
> +  nvmem-cells:
> +    maxItems: 1
> +    description: efuse data for display port calibration
> +
> +  nvmem-cell-names:
> +    const: dp_calibration_data
> +
> +  power-domains:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: Input endpoint of the controller, usually dp_intf
> +
> +      port@1:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: Output endpoint of the controller
> +
> +    required:
> +      - port@0
> +      - port@1
> +
> +  max-lanes:
> +    maxItems: 1
> +    description: maximum number of lanes supported by the hardware.

We already have a 'data-lanes' property defined in 
'video-interfaces.yaml' that can serve this purpose.

> +
> +  max-linkrate:
> +    maxItems: 1
> +    description: maximum link rate supported by the hardware and unit is MHz.

Then use '-mhz' suffix on the property name. Then you don't need a type 
(or maxItems).