linux-kernel - Re: [RFC PATCH 1/4] dt-bindings: Add bidings for mtk,apu-drm

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Date:   Mon, 20 Sep 2021 15:55:58 -0500
From:   Rob Herring <robh@...nel.org>
To:     Alexandre Bailon <abailon@...libre.com>
Cc:     airlied@...ux.ie, daniel@...ll.ch, matthias.bgg@...il.com,
        maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, ohad@...ery.com, bjorn.andersson@...aro.org,
        mathieu.poirier@...aro.org, sumit.semwal@...aro.org,
        christian.koenig@....com, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-remoteproc@...r.kernel.org, linux-media@...r.kernel.org,
        linaro-mm-sig@...ts.linaro.org, khilman@...libre.com,
        gpain@...libre.com
Subject: Re: [RFC PATCH 1/4] dt-bindings: Add bidings for mtk,apu-drm

On Fri, Sep 17, 2021 at 02:59:42PM +0200, Alexandre Bailon wrote:
> This adds the device tree bindings for the APU DRM driver.
> 
> Signed-off-by: Alexandre Bailon <abailon@...libre.com>
> ---
>  .../devicetree/bindings/gpu/mtk,apu-drm.yaml  | 38 +++++++++++++++++++
>  1 file changed, 38 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpu/mtk,apu-drm.yaml
> 
> diff --git a/Documentation/devicetree/bindings/gpu/mtk,apu-drm.yaml b/Documentation/devicetree/bindings/gpu/mtk,apu-drm.yaml
> new file mode 100644
> index 0000000000000..6f432d3ea478c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpu/mtk,apu-drm.yaml
> @@ -0,0 +1,38 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/gpu/mediatek,apu-drm.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: AI Processor Unit DRM

DRM is a linux thing, not h/w.

> +
> +properties:
> +  compatible:
> +    const: mediatek,apu-drm
> +
> +  remoteproc:

So is remoteproc.

Why don't you have the remoteproc driver create the DRM device?

> +    maxItems: 2
> +    description:
> +      Handle to remoteproc devices controlling the APU
> +
> +  iova:
> +    maxItems: 1
> +    description:
> +      Address and size of virtual memory that could used by the APU

Why does this need to be in DT? If you need to reserve certain VAs, then 
this discussion[1] might be of interest.

Rob

[1] https://lore.kernel.org/all/YUIPCxnyRutMS47%2F@orome.fritz.box/