linux-kernel - Re: [PATCH 1/5] dt-bindgins: display: Add Apple pre-DCP display controller bindings

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Message-ID: <ksdp54qj55v7igvvcshl6y2cxpmqy7rlsh4xsixpptjn7s7wlu@76ejtq6ytvbp>
Date: Mon, 25 Nov 2024 08:45:46 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Sasha Finkelstein <fnkl.kernel@...il.com>
Cc: Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>, 
	Alyssa Rosenzweig <alyssa@...enzweig.io>, 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>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Jessica Zhang <quic_jesszhan@...cinc.com>, asahi@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org, dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] dt-bindgins: display: Add Apple pre-DCP display
 controller bindings

On Sun, Nov 24, 2024 at 11:29:24PM +0100, Sasha Finkelstein wrote:
> Add bindings for a secondary display controller present on certain
> Apple laptops.
> 
> Signed-off-by: Sasha Finkelstein <fnkl.kernel@...il.com>
> ---
>  .../bindings/display/apple,display-pipe.yaml       | 59 ++++++++++++++++++++++
>  .../bindings/display/panel/apple,summit.yaml       | 24 +++++++++
>  2 files changed, 83 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/apple,display-pipe.yaml b/Documentation/devicetree/bindings/display/apple,display-pipe.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..bd25ddc6e09dd636c0221c854e594113f6011866
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/apple,display-pipe.yaml

No, use fallback compatible as filename.

> @@ -0,0 +1,59 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/apple,display-pipe.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Apple pre-DCP display controller.
> +
> +maintainers:
> +  - asahi@...ts.linux.dev
> +  - Sasha Finkelstein <fnkl.kernel@...il.com>
> +
> +description: |

Drop |

> +  A secondary display controller used to drive the "touchbar" on certain
> +  Apple laptops.
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +        - "apple,t8112-display-pipe"
> +        - "apple,t8103-display-pipe"
> +      - const: "apple,h7-display-pipe"


This wasn't tested... Drop all quotes. Do you see any file with quotes?
Why doing things entirely different than everyone else?

> +
> +  reg:
> +    minItems: 3

Drop

> +    maxItems: 3
> +
> +  reg-names:
> +    items:
> +      - const: be
> +      - const: fe
> +      - const: mipi
> +
> +  power-domains: true

List the items instead or maxItems: 1.

> +
> +  interrupts:
> +    minItems: 2

Drop

> +    maxItems: 2
> +
> +  interrupt-names:
> +    items:
> +      - const: be
> +      - const: fe
> +
> +  iommus: true


maxItems: 1

> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +additionalProperties: true

This cannot be true. Must be false.

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts

This goes before additionalProperties.

Missing example: that's a strong NAK and prove that this could not be
even tested.

Do you see any device schema without example? No. Do not develop things
differently, Apple is not unique, special or exceptional.


> diff --git a/Documentation/devicetree/bindings/display/panel/apple,summit.yaml b/Documentation/devicetree/bindings/display/panel/apple,summit.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..dc281c1f52c1ed07cc2f7f804dcfd2f3b4239d89
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/panel/apple,summit.yaml
> @@ -0,0 +1,24 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/panel/apple,summit.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Apple "Summit" display panel.
> +
> +maintainers:
> +  - asahi@...ts.linux.dev
> +  - Sasha Finkelstein <fnkl.kernel@...il.com>
> +
> +properties:
> +  compatible:
> +    const: apple,summit

No, too generic. Panels need much more properties, this is heavily
incomplete. See other panel bindings.

Best regards,
Krzysztof