linux-kernel - Re: [PATCH v3 1/5] dt-bindings: display: Add Apple pre-DCP display controller

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Message-ID: <7rr3fja4rxjbdmgpdqaid5fybiu6uctpbvp24ujv5drfmeiowf@u4pkhzyhy3pd>
Date: Mon, 13 Jan 2025 09:58:59 +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, Alyssa Ross <hi@...ssa.is>
Subject: Re: [PATCH v3 1/5] dt-bindings: display: Add Apple pre-DCP display
 controller

On Sun, Jan 12, 2025 at 09:43:48PM +0100, Sasha Finkelstein wrote:
 +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: Input port. Always connected to the primary controller
> +
> +      port@1:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: Output MIPI DSI port to the panel
> +
> +    required:
> +      - port@0
> +      - port@1
> +
> +required:
> +  - compatible
> +  - reg
> +  - ports
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    dsi@...200000 {
> +        compatible = "apple,t8103-display-pipe-mipi", "apple,h7-display-pipe-mipi";
> +        reg = <0x28200000 0xc000>;

This looks not matching unit address.

> +        power-domains = <&ps_dispdfr_mipi>;
> +
> +        ports {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            port@0 {
> +                reg = <0>;
> +                #address-cells = <1>;
> +                #size-cells = <0>;

Make the example complete, so you will see that address/size cells are
unnecessary here or, if you really have more than one endpoint, they are
supposed to be here.

> +            };
> +
> +            port@1 {
> +                reg = <1>;
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +            };
> +        };
> +    };
> +...
> diff --git a/Documentation/devicetree/bindings/display/apple,h7-display-pipe.yaml b/Documentation/devicetree/bindings/display/apple,h7-display-pipe.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..dc07edccb437b221ea9772b9356e1896326aa7da
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/apple,h7-display-pipe.yaml
> @@ -0,0 +1,88 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/apple,h7-display-pipe.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Apple pre-DCP display controller
> +
> +maintainers:
> +  - Sasha Finkelstein <fnkl.kernel@...il.com>
> +
> +description:
> +  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
> +
> +  reg:
> +    maxItems: 2
> +
> +  reg-names:
> +    items:
> +      - const: be
> +        description: Primary register block, controls planes and blendinga

Description goes to 'reg:' field, just like I asked last time.

> +      - const: fe
> +        description:
> +          Contains other configuration registers like interrupt
> +          and FIFO control
> +
> +  power-domains:
> +    description:
> +      Phandles to pmgr entries that are needed for this controller to turn on.
> +      Aside from that, their specific functions are unknown
> +    maxItems: 2
> +
> +  interrupts:

Same comments as before - list and describe the items.

Best regards,
Krzysztof