linux-kernel - Re: [PATH 3/4] dt-bindings: display: Add virtual DRM

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Date:   Tue, 22 Jun 2021 10:54:56 -0600
From:   Rob Herring <robh@...nel.org>
To:     Tomohito Esaki <etom@...l.co.jp>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        dri-devel@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATH 3/4] dt-bindings: display: Add virtual DRM

On Mon, Jun 21, 2021 at 03:44:02PM +0900, Tomohito Esaki wrote:
> Add device tree bindings documentation for virtual DRM.

DRM is a Linuxism. What's virtual DRM? Why does it need to be in DT? 
What's the usecase? You're going to need a lot more reasoning to justify 
this for DT.

> 
> Signed-off-by: Tomohito Esaki <etom@...l.co.jp>
> ---
>  .../devicetree/bindings/display/vdrm.yaml     | 67 +++++++++++++++++++
>  1 file changed, 67 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/vdrm.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/vdrm.yaml b/Documentation/devicetree/bindings/display/vdrm.yaml
> new file mode 100644
> index 000000000000..6493bb0fc09f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/vdrm.yaml
> @@ -0,0 +1,67 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/vdrm.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Virtual DRM Device Tree Bindings
> +
> +description:
> +  This document defines device tree properties virtual DRM. The initial
> +  position, size and z-position of the plane used in the virtual DRM is
> +  specified.
> +  The current limitation is that these settings are applied to all crtc.
> +
> +properties:
> +  compatible:
> +    const: virt-drm
> +
> +patternProperties:
> +  "^plane(@.*)?$":
> +    description: Information of the planes used in virtual DRM
> +    type: object
> +
> +    properties:
> +      x:
> +        type: int
> +        description: x-coordinate of the left-top of the plane in pixels
> +
> +      y:
> +        type: int
> +        description: y-coordinate of the left-top of the plane in pixels
> +
> +      width:
> +        type: int
> +        description: width of the plane in pixels
> +
> +      height:
> +        type: int
> +	description: height of the plane in pixels
> +
> +      zpos:
> +        type: int
> +        description: z-position of the plane
> +
> +    required:
> +      - x
> +      - y
> +      - width
> +      - height
> +      - zpos
> +
> +required:
> +  - compatible
> +  - "^plane(@.*)?$"
> +
> +examples:
> + - |
> +   vdrm@0 {
> +       compatible = "virt-drm";
> +       plane@0 {
> +           x = <200>;
> +	   y = <100>;
> +	   width = <800>;
> +	   height = <600>;
> +	   zpos = <1>;
> +       };
> +   };
> -- 
> 2.25.1
> 
>