linux-kernel - Re: [PATCH v3 1/3] dt-bindings: display: samsung,exynos7-decon: add properties for iommus and ports

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Message-ID: <20250627-literate-talented-panda-cbac89@krzk-bin>
Date: Fri, 27 Jun 2025 09:50:52 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Kaustabh Chakraborty <kauschluss@...root.org>
Cc: Inki Dae <inki.dae@...sung.com>, 
	Seung-Woo Kim <sw0312.kim@...sung.com>, Kyungmin Park <kyungmin.park@...sung.com>, 
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
	Alim Akhtar <alim.akhtar@...sung.com>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
	Rob Herring <robh@...nel.org>, Conor Dooley <conor@...nel.org>, 
	Ajay Kumar <ajaykumar.rs@...sung.com>, Akshu Agrawal <akshua@...il.com>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	dri-devel@...ts.freedesktop.org, linux-arm-kernel@...ts.infradead.org, 
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 1/3] dt-bindings: display: samsung,exynos7-decon: add
 properties for iommus and ports

On Fri, Jun 27, 2025 at 12:50:28AM +0530, Kaustabh Chakraborty wrote:
> Similar to FIMD and Exynos5433's DECON, the Exynos7 DECON hardware:
> - May optionally require an IOMMU to initialize a display region.
> - May require a port connection to another block, say an MIC or a DSI
>   master.
> 
> Document these bindings in the devicetree schema.
> 
> Signed-off-by: Kaustabh Chakraborty <kauschluss@...root.org>
> ---
>  .../bindings/display/samsung/samsung,exynos7-decon.yaml           | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/samsung/samsung,exynos7-decon.yaml b/Documentation/devicetree/bindings/display/samsung/samsung,exynos7-decon.yaml
> index 53916e4c95d8c0369138941a556c23f5d42fbd39..1e9500c86590d555cfa6f04790e2b64da291b78b 100644
> --- a/Documentation/devicetree/bindings/display/samsung/samsung,exynos7-decon.yaml
> +++ b/Documentation/devicetree/bindings/display/samsung/samsung,exynos7-decon.yaml
> @@ -80,6 +80,14 @@ properties:
>        - const: vsync
>        - const: lcd_sys
>  
> +  iommus:
> +    maxItems: 1
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +    description:
> +      Contains a port which is connected to mic or dsim node.

You need to list and describe the ports.

Best regards,
Krzysztof