linux-kernel - Re: [PATCH v3 4/6] dt-bindings: display: mediatek: disp-tdshp: Add support for MT8196

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Message-ID: <20250811-boisterous-skinny-ammonite-a4ca7b@kuoka>
Date: Mon, 11 Aug 2025 09:52:20 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Jay Liu <jay.liu@...iatek.com>
Cc: Chun-Kuang Hu <chunkuang.hu@...nel.org>, 
	Philipp Zabel <p.zabel@...gutronix.de>, David Airlie <airlied@...il.com>, 
	Simona Vetter <simona@...ll.ch>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.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
Subject: Re: [PATCH v3 4/6] dt-bindings: display: mediatek: disp-tdshp: Add
 support for MT8196

On Fri, Aug 08, 2025 at 08:53:59PM +0800, Jay Liu wrote:
> Add disp-tdshp hardware description for MediaTek MT8196 SoC
> 
> Signed-off-by: Jay Liu <jay.liu@...iatek.com>
> ---
>  .../display/mediatek/mediatek,disp-tdshp.yaml | 52 +++++++++++++++++++
>  1 file changed, 52 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/mediatek/mediatek,disp-tdshp.yaml

We expect filename based on compatibles (see writing bindings).

> 
> diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,disp-tdshp.yaml b/Documentation/devicetree/bindings/display/mediatek/mediatek,disp-tdshp.yaml
> new file mode 100644
> index 000000000000..94aa33a2a5ed
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,disp-tdshp.yaml
> @@ -0,0 +1,52 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/mediatek/mediatek,disp-tdshp.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek display 2D sharpness processor
> +
> +maintainers:
> +  - Chun-Kuang Hu <chunkuang.hu@...nel.org>
> +  - Philipp Zabel <p.zabel@...gutronix.de>
> +
> +description: |
> +  MediaTek display 2D sharpness processor, namely TDSHP, provides a
> +  operation used to adjust sharpness in display system.
> +  TDSHP device node must be siblings to the central MMSYS_CONFIG node.

Heh? Why would this have to be a sibling? This is really odd, because
you cannto actually rely on that.

You just added unverifiable unusual ABI with no explanation.


> +  For a description of the MMSYS_CONFIG binding, see
> +  Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml
> +  for details.
> +
> +properties:
> +  compatible:
> +    items:

Drop, just enum.

> +      - enum:
> +          - mediatek,mt8196-disp-tdshp
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +

Drop blank line

> +    soc {
> +      #address-cells = <2>;
> +      #size-cells = <2>;

messed indentation

> +
> +      disp-tdshp@...e0000 {

Node names should be generic. See also an explanation and list of
examples (not exhaustive) in DT specification:
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

e.g. image-processor

Best regards,
Krzysztof