Re: [PATCH v9 3/6] media: dt-bindings: Add Amlogic V4L2 video decoder

[Zhentao Guo <zhentao.guo@amlogic.com>]

> On 17/09/2026 05:07, Zhentao Guo wrote:
>> Hi Krzysztof,
>>
>>> On Mon, Sep 14, 2026 at 04:10:20PM +0800, Zhentao Guo wrote:
>>>> Describe the initial support for the V4L2 stateless video decoder
>>>> driver used with the Amlogic S4 (S805X2) platform.
>>> Drop driver. Describe the hardware instead.
>> OK，got it.
>>>> Signed-off-by: Zhentao Guo <zhentao.guo@amlogic.com>
>>>> ---
>>>>    .../devicetree/bindings/media/amlogic,s4-vdec.yaml | 114 +++++++++++++++++++++
>>>>    1 file changed, 114 insertions(+)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/media/amlogic,s4-vdec.yaml b/Documentation/devicetree/bindings/media/amlogic,s4-vdec.yaml
>>>> new file mode 100644
>>>> index 000000000000..d350b3e68a38
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/media/amlogic,s4-vdec.yaml
>>>> @@ -0,0 +1,114 @@
>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>>> +# Copyright (C) 2025 Amlogic, Inc. All rights reserved
>>>> +%YAML 1.2
>>>> +---
>>>> +$id: http://devicetree.org/schemas/media/amlogic,s4-vdec.yaml#
>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>> +
>>>> +title: Amlogic Video Decode Accelerator
>>>> +
>>>> +maintainers:
>>>> +  - Zhentao Guo <zhentao.guo@amlogic.com>
>>>> +
>>>> +description:
>>>> +  The Video Decoder Accelerator present on Amlogic SOCs.
>>>> +  It supports stateless h264 decoding.
>>>> +
>>>> +properties:
>>>> +  compatible:
>>>> +    const: amlogic,s4-vdec
>>>> +
>>>> +  reg:
>>>> +    maxItems: 2
>>>> +
>>>> +  reg-names:
>>>> +    items:
>>>> +      - const: dos
>>>> +      - const: dmc
>>>> +
>>>> +  interrupts:
>>>> +    maxItems: 2
>>>> +
>>>> +  interrupt-names:
>>>> +    items:
>>>> +      - const: core_hvdec
>>>> +      - const: core_vdec
>>> Drop "core_" from both... or rather some consistency would be more
>>> useful. Below you call them core_v and core_h, but there is also:
>>>
>>>> +
>>>> +  clocks:
>>>> +    items:
>>>> +      - description: Clock for dos core
>>> core dos?
>> To explain this, I would like to show you the structure diagram of the
>> Amlogic hardware decoder IP:
>>
>> +-----------+------------------------+
>> |           |                        |
>> |           |        vdec            |
>> |           |                        |
>> |    dos    +------------------------+
>> |           |                        |
>> |           |        hvdec           |
>> |           |                        |
>> +-----------+------------------------+
>>
>> The IP consists of three cores. Dos core is in the front of the IP,
>> which controls the rest two cores. The actual hardware decoding is
>> handled by the two cores vdec and hvdec.
>>
>> Each of the three cores has its own independent clock source.
> So everything could be called consistently "dos", "vdec" and "hvdec" in
> all properties (clocks, interrupts etC).
Got it, thanks!
>
> Best regards,
> Krzysztof

BRs

Zhentao


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