linux-kernel - Re: [PATCH v15 01/11] dt-bindings: mediatek,dp: Add Display Port binding

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Date:   Wed, 27 Jul 2022 09:23:34 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Bo-Chen Chen <rex-bc.chen@...iatek.com>, chunkuang.hu@...nel.org,
        p.zabel@...gutronix.de, daniel@...ll.ch, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, mripard@...nel.org,
        tzimmermann@...e.de, matthias.bgg@...il.com, deller@....de,
        airlied@...ux.ie
Cc:     msp@...libre.com, granquet@...libre.com, jitao.shi@...iatek.com,
        wenst@...omium.org, angelogioacchino.delregno@...labora.com,
        ck.hu@...iatek.com, liangxu.xu@...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 v15 01/11] dt-bindings: mediatek,dp: Add Display Port
 binding

On 27/07/2022 06:50, 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>
> Signed-off-by: Bo-Chen Chen <rex-bc.chen@...iatek.com>
> ---
>  .../display/mediatek/mediatek,dp.yaml         | 117 ++++++++++++++++++
>  1 file changed, 117 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..fd68c6c08df3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,dp.yaml
> @@ -0,0 +1,117 @@
> +# 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 TX (DP) and
> +  embedded display port TX (eDP) controller present on some MediaTek SoCs.

Drop entire sentence and just describe the hardware.

> +  We just need to enable the power domain of DP. The clock of DP is
> +  generated by itself and we are not using other PLL to generate clocks.
> +  MediaTek DP and eDP are different hardwares and there are some features
> +  which are not supported for eDP. For example, audio is not supported for
> +  eDP. Therefore, we need to use two different compatibles to describe them.
> +
> +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:
> +        $ref: /schemas/graph.yaml#/$defs/port-base
> +        unevaluatedProperties: false
> +        description: Output endpoint of the controller
> +        properties:
> +          endpoint:
> +            $ref: /schemas/media/video-interfaces.yaml#
> +            unevaluatedProperties: false
> +            properties:
> +              data-lanes:
> +                description: |
> +                  number of lanes supported by the hardware.
> +                  The possible values:
> +                  0       - For 1 lane enabled in IP.
> +                  0 1     - For 2 lanes enabled in IP.
> +                  0 1 2 3 - For 4 lanes enabled in IP.
> +                minItems: 1
> +                maxItems: 4
> +            required:
> +              - data-lanes
> +
> +    required:
> +      - port@0
> +      - port@1
> +
> +  max-linkrate-mhz:
> +    enum: [ 1620, 2700, 5400, 8100 ]
> +    description: maximum link rate supported by the hardware.
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - ports
> +  - max-linkrate-mhz
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/power/mt8195-power.h>
> +    dp_tx@...00000 {

No underscores in node names, so just "dp".

Best regards,
Krzysztof