linux-kernel - Re: [PATCH 02/10] dt-bindings: display: imx: Add i.MX8qxp Display Controller display engine

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Message-ID: <b9583c86-b5ed-4642-9baf-2ac850656ee3@nxp.com>
Date: Mon, 8 Jul 2024 14:40:53 +0800
From: Liu Ying <victor.liu@....com>
To: Krzysztof Kozlowski <krzk@...nel.org>, dri-devel@...ts.freedesktop.org,
 devicetree@...r.kernel.org, imx@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: p.zabel@...gutronix.de, airlied@...il.com, daniel@...ll.ch,
 maarten.lankhorst@...ux.intel.com, mripard@...nel.org, tzimmermann@...e.de,
 robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
 festevam@...il.com, tglx@...utronix.de
Subject: Re: [PATCH 02/10] dt-bindings: display: imx: Add i.MX8qxp Display
 Controller display engine

On 07/07/2024, Krzysztof Kozlowski wrote:
> On 05/07/2024 11:09, Liu Ying wrote:
>> i.MX8qxp Display Controller display engine consists of all processing units
>> that operate in a display clock domain.
>>
>> Signed-off-by: Liu Ying <victor.liu@....com>
>> ---
>>  .../imx/fsl,imx8qxp-dc-display-engine.yaml    | 166 ++++++++++++++++++
>>  1 file changed, 166 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-display-engine.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-display-engine.yaml b/Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-display-engine.yaml
>> new file mode 100644
>> index 000000000000..dc9579897b76
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/display/imx/fsl,imx8qxp-dc-display-engine.yaml
>> @@ -0,0 +1,166 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/display/imx/fsl,imx8qxp-dc-display-engine.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Freescale i.MX8qxp Display Controller Display Engine
>> +
>> +description:
>> +  All Processing Units that operate in a display clock domain. Pixel pipeline
>> +  is driven by a video timing and cannot be stalled. Implements all display
>> +  specific processing.
>> +
>> +maintainers:
>> +  - Liu Ying <victor.liu@....com>
>> +
>> +properties:
>> +  compatible:
>> +    const: fsl,imx8qxp-dc-display-engine
>> +
>> +  reg:
>> +    maxItems: 2
>> +
>> +  reg-names:
>> +    items:
>> +      - const: top
>> +      - const: cfg
>> +
>> +  resets:
>> +    maxItems: 1
>> +
>> +  interrupts:
>> +    maxItems: 3
>> +
>> +  interrupt-names:
>> +    items:
>> +      - const: shdload
>> +      - const: framecomplete
>> +      - const: seqcomplete
>> +
>> +  power-domains:
>> +    maxItems: 1
>> +
>> +  "#address-cells":
>> +    const: 1
>> +
>> +  "#size-cells":
>> +    const: 1
>> +
>> +  ranges: true
>> +
>> +  fsl,dc-de-id:
>> +    description: Display Engine instance number
>> +    $ref: /schemas/types.yaml#/definitions/uint32
>> +    enum: [0, 1]
> 
> No, drop. For the same reason as earlier patch.

Call of_alias_get_id() from the driver instead?

> 
>> +
>> +  port:
>> +    $ref: /schemas/graph.yaml#/properties/port
>> +    description: video output
> 
> Eh, mixing children with and without addresses is considered poor design.

Will move this to the tcon child node as it is the
last processing unit in the display engine.

> 
>> +
>> +patternProperties:
>> +  "^dither@[0-9a-f]+$":
>> +    type: object
>> +    additionalProperties: true
>> +
>> +    properties:
>> +      compatible:
>> +        const: fsl,imx8qxp-dc-dither
>> +
>> +  "^framegen@[0-9a-f]+$":
>> +    type: object
>> +    additionalProperties: true
>> +
>> +    properties:
>> +      compatible:
>> +        const: fsl,imx8qxp-dc-framegen
>> +
>> +  "^gammacor@[0-9a-f]+$":
> 
> This looks like you are organizing bindings per your driver architecture.

As I mentioned in cover letter, this series addresses Maxime's
comment for the previous series - split the display controller
into multiple internal devices.  Maxime insisted on doing this.

> 
> Best regards,
> Krzysztof
> 

-- 
Regards,
Liu Ying