linux-kernel - Re: [PATCH v4 2/2] dt-bindings: display: rockchip: Convert cdn-dp-rockchip.txt to yaml

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Message-ID: <632f9f4d-ec0f-4512-a153-d2abfd9f6841@rock-chips.com>
Date: Mon, 19 May 2025 14:56:03 +0800
From: Chaoyi Chen <chaoyi.chen@...k-chips.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, Chaoyi Chen <kernel@...kyi.com>,
 Sandy Huang <hjc@...k-chips.com>, Heiko Stuebner <heiko@...ech.de>,
 Andy Yan <andy.yan@...k-chips.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: Dragan Simic <dsimic@...jaro.org>, dri-devel@...ts.freedesktop.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/2] dt-bindings: display: rockchip: Convert
 cdn-dp-rockchip.txt to yaml

Hi Krzysztof,

On 2025/5/19 14:16, Krzysztof Kozlowski wrote:
> On 19/05/2025 03:26, Chaoyi Chen wrote:
>> +maintainers:
>> +  - Andy Yan <andy.yan@...k-chip.com>
>> +  - Heiko Stuebner <heiko@...ech.de>
>> +  - Sandy Huang <hjc@...k-chips.com>
>> +
>> +allOf:
>> +  - $ref: /schemas/sound/dai-common.yaml#
>> +
>> +properties:
>> +  compatible:
>> +    items:
>> +      - const: rockchip,rk3399-cdn-dp
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  clocks:
>> +    items:
>> +      - description: DP core work clock
>> +      - description: APB clock
>> +      - description: SPDIF interface clock
>> +      - description: GRF clock
>> +
>> +  clock-names:
>> +    items:
>> +      - const: core-clk
>> +      - const: pclk
>> +      - const: spdif
>> +      - const: grf
>> +
>> +  extcon:
>> +    $ref: /schemas/types.yaml#/definitions/phandle-array
>> +    items:
>> +      maxItems: 1
>> +    maxItems: 2
> Instead of this, list the items. Old binding said only "specifier", so
> this is technically a change, which should be explained in commit msg.

Will fix in v5.


>
>> +    description:
>> +      List of phandle to the extcon device providing the cable state for the DP PHY.
>> +
>> +  interrupts:
>> +    maxItems: 1
>> +
>> +  phys:
>> +    items:
>> +      maxItems: 1
>> +    maxItems: 2
>> +    description: |
>> +      List of phandle to the PHY device for DP output.
>> +      RK3399 have two DP-TPYEC PHY, specifying one PHY which want to use,
>> +      or specify two PHYs here to let the driver determine which PHY to use.
>
> You do not allow one phy, so your description is not accurate. OTOH,
> original binding did not allow two phandles, so that's another change in
> the binding. You need to document all changes done to the binding in the
> commit msg.

Oh, the original binding example use two phandles. I think only one PHY 
can also pass the dtb check here, or maybe I'm missing something else?


>
>> +
>> +  ports:
>> +    $ref: /schemas/graph.yaml#/properties/ports
>> +
>> +    properties:
>> +      port@0:
>> +        $ref: /schemas/graph.yaml#/properties/port
>> +        description: Input of the CDN DP
>> +        properties:
>> +          endpoint@0:
>> +            description: Connection to the VOPB
>> +          endpoint@1:
>> +            description: Connection to the VOPL
>> +      port@1:
>> +        $ref: /schemas/graph.yaml#/properties/port
>> +        description: Output of the CDN DP
>> +
>> +    required:
>> +      - port@0
>> +      - port@1
>> +
>> +  power-domains:
>> +    maxItems: 1
>> +
>> +  resets:
>> +    maxItems: 4
>> +
>> +  reset-names:
>> +    items:
>> +      - const: spdif
>> +      - const: dptx
>> +      - const: apb
>> +      - const: core
>> +
>> +  rockchip,grf:
>> +    $ref: /schemas/types.yaml#/definitions/phandle
>> +    description:
>> +      Phandle to GRF register to control HPD.
>> +
>> +  "#sound-dai-cells":
>> +    const: 1
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - clocks
>> +  - clock-names
>> +  - interrupts
>> +  - phys
>> +  - ports
>> +  - resets
>> +  - reset-names
>> +  - rockchip,grf
>
> sound-dai-cells was a required property.
>
Okay, will add in v5.