linux-kernel - Re: [PATCH 8/9] dt-bindings: reserved-memory: MediaTek: Add reserved memory for SVP

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Date:   Mon, 11 Sep 2023 10:44:48 -0500
From:   Rob Herring <robh@...nel.org>
To:     Yong Wu <yong.wu@...iatek.com>
Cc:     Sumit Semwal <sumit.semwal@...aro.org>, christian.koenig@....com,
        Matthias Brugger <matthias.bgg@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        Brian Starkey <Brian.Starkey@....com>,
        John Stultz <jstultz@...gle.com>, tjmercier@...gle.com,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, jianjiao.zeng@...iatek.com,
        kuohong.wang@...iatek.com
Subject: Re: [PATCH 8/9] dt-bindings: reserved-memory: MediaTek: Add reserved
 memory for SVP

On Mon, Sep 11, 2023 at 10:30:37AM +0800, Yong Wu wrote:
> This adds the binding for describing a CMA memory for MediaTek SVP(Secure
> Video Path).

CMA is a Linux thing. How is this related to CMA?

> 
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> ---
>  .../mediatek,secure_cma_chunkmem.yaml         | 42 +++++++++++++++++++
>  1 file changed, 42 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/reserved-memory/mediatek,secure_cma_chunkmem.yaml
> 
> diff --git a/Documentation/devicetree/bindings/reserved-memory/mediatek,secure_cma_chunkmem.yaml b/Documentation/devicetree/bindings/reserved-memory/mediatek,secure_cma_chunkmem.yaml
> new file mode 100644
> index 000000000000..cc10e00d35c4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/reserved-memory/mediatek,secure_cma_chunkmem.yaml
> @@ -0,0 +1,42 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/reserved-memory/mediatek,secure_cma_chunkmem.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: MediaTek Secure Video Path Reserved Memory

What makes this specific to Mediatek? Secure video path is fairly 
common, right?

> +
> +description:
> +  This binding describes the reserved memory for secure video path.
> +
> +maintainers:
> +  - Yong Wu <yong.wu@...iatek.com>
> +
> +allOf:
> +  - $ref: reserved-memory.yaml
> +
> +properties:
> +  compatible:
> +    const: mediatek,secure_cma_chunkmem
> +
> +required:
> +  - compatible
> +  - reg
> +  - reusable
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +
> +    reserved-memory {
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +        ranges;
> +
> +        reserved-memory@...00000 {
> +            compatible = "mediatek,secure_cma_chunkmem";
> +            reusable;
> +            reg = <0x80000000 0x18000000>;
> +        };
> +    };
> -- 
> 2.25.1
>