linux-kernel - Re: [PATCH 7/9] media: dt-bindings: Add Chameleon v3 framebuffer

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Date: Thu, 15 Feb 2024 17:29:40 +0000
From: Conor Dooley <conor@...nel.org>
To: Paweł Anikiel <panikiel@...gle.com>
Cc: airlied@...il.com, akpm@...ux-foundation.org, conor+dt@...nel.org,
	daniel@...ll.ch, dinguyen@...nel.org, hverkuil-cisco@...all.nl,
	krzysztof.kozlowski+dt@...aro.org,
	maarten.lankhorst@...ux.intel.com, mchehab@...nel.org,
	mripard@...nel.org, robh+dt@...nel.org, tzimmermann@...e.de,
	devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
	chromeos-krk-upstreaming@...gle.com, ribalda@...omium.org
Subject: Re: [PATCH 7/9] media: dt-bindings: Add Chameleon v3 framebuffer

On Mon, Feb 12, 2024 at 01:13:21PM +0000, Paweł Anikiel wrote:
> The Chameleon v3 uses the framebuffer IP core to take the video signal
> from different sources and directly write frames into memory.
> 
> Signed-off-by: Paweł Anikiel <panikiel@...gle.com>
> ---
>  .../bindings/media/google,chv3-fb.yaml        | 77 +++++++++++++++++++
>  1 file changed, 77 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/media/google,chv3-fb.yaml
> 
> diff --git a/Documentation/devicetree/bindings/media/google,chv3-fb.yaml b/Documentation/devicetree/bindings/media/google,chv3-fb.yaml
> new file mode 100644
> index 000000000000..ba6643cc7232
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/google,chv3-fb.yaml
> @@ -0,0 +1,77 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/google,chv3-fb.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Google Chameleon v3 video framebuffer
> +
> +maintainers:
> +  - Paweł Anikiel <panikiel@...gle.com>
> +
> +properties:
> +  compatible:
> +    const: google,chv3-fb
> +
> +  reg:
> +    items:
> +      - description: core registers
> +      - description: irq registers
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  google,legacy-format:
> +    type: boolean
> +    description: The incoming video stream is in 32-bit padded mode.
> +
> +  google,no-endpoint:
> +    type: boolean
> +    description:
> +      The framebuffer isn't connected to a controllable endpoint.
> +      The video interface still works, but EDID control is unavailable
> +      and DV timing information only reports the active video width/height.

Why does this need a dedicated property? Is it not sufficient to check
that there are no endpoints in the devicetree?

Cheers,
Conor.

> +
> +  port:
> +    $ref: /schemas/graph.yaml#/properties/port
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +
> +allOf:
> +  - if:
> +      not:
> +        required:
> +          - google,no-endpoint
> +    then:
> +      required:
> +        - port
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    video@...60500 {
> +        compatible = "google,chv3-fb";
> +        reg = <0xc0060500 0x100>,
> +              <0xc0060f20 0x10>;
> +        interrupts = <GIC_SPI 19 IRQ_TYPE_LEVEL_HIGH>;
> +        google,legacy-format;
> +        google,no-endpoint;
> +    };
> +
> +  - |
> +    video@...60600 {
> +        compatible = "google,chv3-fb";
> +        reg = <0xc0060600 0x100>,
> +              <0xc0060f30 0x10>;
> +        interrupts = <GIC_SPI 22 IRQ_TYPE_LEVEL_HIGH>;
> +
> +        port {
> +            fb_mst0_0: endpoint {
> +                remote-endpoint = <&dprx_mst_0>;
> +            };
> +        };
> +    };
> -- 
> 2.43.0.687.g38aa6559b0-goog
> 

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