linux-kernel - Re: [PATCH 1/3] dt-bindings: vdec: Add binding document of Amlogic decoder accelerator

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Message-ID: <b989fba3-223d-498a-8efe-7a60e26cf0db@kernel.org>
Date: Mon, 27 Oct 2025 14:05:08 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: zhentao.guo@...ogic.com, Mauro Carvalho Chehab <mchehab@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Neil Armstrong <neil.armstrong@...aro.org>,
 Kevin Hilman <khilman@...libre.com>, Jerome Brunet <jbrunet@...libre.com>,
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc: linux-media@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-amlogic@...ts.infradead.org
Subject: Re: [PATCH 1/3] dt-bindings: vdec: Add binding document of Amlogic
 decoder accelerator

On 27/10/2025 06:42, Zhentao Guo via B4 Relay wrote:
> From: Zhentao Guo <zhentao.guo@...ogic.com>
> 
> Add dt-binding of the Amlogic hardware decoder accelerator.

Please use subject prefixes matching the subsystem. You can get them for
example with `git log --oneline -- DIRECTORY_OR_FILE` on the directory
your patch is touching. For bindings, the preferred subjects are
explained here:
https://www.kernel.org/doc/html/latest/devicetree/bindings/submitting-patches.html#i-for-patch-submitters

A nit, subject: drop second/last, redundant "binding document for". The
"dt-bindings" prefix is already stating that these are bindings.
See also:
https://elixir.bootlin.com/linux/v6.17-rc3/source/Documentation/devicetree/bindings/submitting-patches.rst#L18

> 
> Signed-off-by: Zhentao Guo <zhentao.guo@...ogic.com>
> ---
>  .../bindings/media/amlogic,vcodec-dec.yaml         | 96 ++++++++++++++++++++++
>  1 file changed, 96 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/media/amlogic,vcodec-dec.yaml b/Documentation/devicetree/bindings/media/amlogic,vcodec-dec.yaml
> new file mode 100644
> index 000000000000..6cea8af72639
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/amlogic,vcodec-dec.yaml

Filename matching compatible.

> @@ -0,0 +1,96 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) 2025 Amlogic, Inc. All rights reserved
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/amlogic,vcodec-dec.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Amlogic Video Decode Accelerator
> +
> +maintainers:
> +  - Zhentao Guo <zhentao.guo@...ogic.com>
> +
> +description: |


Do not need '|' unless you need to preserve formatting.

> +  The Video Decoder Accelerator present on Amlogic SOCs.
> +  It supports stateless h264 decoding.
> +
> +properties:
> +  compatible:
> +    const: amlogic,s4-vcodec-dec
> +
> +  reg:
> +    maxItems: 2
> +
> +  reg-names:
> +    items:
> +      - const: dosbus
> +      - const: dmcbus

Is "bus" really name of this in datasheet?

> +
> +  interrupts:
> +    maxItems: 3
> +
> +  interrupt-names:
> +    items:
> +      - const: mailbox_0
> +      - const: mailbox_1
> +      - const: mailbox_2

Useless names, so just drop interrupt-names property.

> +
> +  clocks:
> +    maxItems: 3
> +
> +  clock-names:
> +    items:
> +      - const: vdec
> +      - const: clk_vdec_mux
> +      - const: clk_hevcf_mux
> +
> +  power-domains:
> +    maxItems: 2
> +
> +  power-domain-names:
> +    items:
> +      - const: pwrc-vdec

Drop pwrc

> +      - const: pwrc-hevc

Drop pwrc

Missing iommus. I really doubt hardware works without IOMMU.



Best regards,
Krzysztof