linux-kernel - Re: [PATCH 1/4] media: dt-bindings: cedrus: Allow power domain references

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Date:   Thu, 5 Jan 2023 11:43:37 +0100
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Conor Dooley <conor@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Maxime Ripard <mripard@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-staging@...ts.linux.dev,
        linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH 1/4] media: dt-bindings: cedrus: Allow power domain
 references

Hi Samuel,

On Sat 31 Dec 22, 10:46, Samuel Holland wrote:
> The Allwinner D1 SoC contains a separate power domain for its video
> engine, controlled via the "PPU" power controller. Allow the
> power-domains property so this can be represented in the devicetree.

I've been looking around for information regarding the PPU and couldn't find
anything about it. Do you have some reference where it is mentionned?

I do see a power domain driver (apparently for the GPU) on recent allwinner
kernel releases but that seems to be for arm64 chips only.

Cheers,

Paul

> Signed-off-by: Samuel Holland <samuel@...lland.org>
> ---
> 
>  .../bindings/media/allwinner,sun4i-a10-video-engine.yaml       | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/media/allwinner,sun4i-a10-video-engine.yaml b/Documentation/devicetree/bindings/media/allwinner,sun4i-a10-video-engine.yaml
> index 541325f900a1..d5be7f604e8c 100644
> --- a/Documentation/devicetree/bindings/media/allwinner,sun4i-a10-video-engine.yaml
> +++ b/Documentation/devicetree/bindings/media/allwinner,sun4i-a10-video-engine.yaml
> @@ -63,6 +63,9 @@ properties:
>        CMA pool to use for buffers allocation instead of the default
>        CMA pool.
>  
> +  power-domains:
> +    maxItems: 1
> +
>  required:
>    - compatible
>    - reg
> -- 
> 2.37.4
> 

-- 
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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