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

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Message-ID: <fd77eb21-4324-4f86-858c-c6b5a63f68c7@amlogic.com>
Date: Tue, 28 Oct 2025 20:23:43 +0800
From: Zhentao Guo <zhentao.guo@...ogic.com>
To: Krzysztof Kozlowski <krzk@...nel.org>,
 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


在 2025/10/28 19:33, Krzysztof Kozlowski 写道:
> [ EXTERNAL EMAIL ]
>
> On 28/10/2025 12:14, Zhentao Guo wrote:
>>>> +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?
>> No, it is not from the datasheet, in fact it was inherited from the
>> older SOCs. Do you have any suggestions about this?
> dos, dmc
Got it, thanks!
>
>>>> +
>>>> +  interrupts:
>>>> +    maxItems: 3
>>>> +
>>>> +  interrupt-names:
>>>> +    items:
>>>> +      - const: mailbox_0
>>>> +      - const: mailbox_1
>>>> +      - const: mailbox_2
>>> Useless names, so just drop interrupt-names property.
>> Yes, we don't need the interrupt names. I'll drop them.
>>>> +
>>>> +  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
>> Ok, I'll drop the two pwrc(s) above.
>>> Missing iommus. I really doubt hardware works without IOMMU.
>> IOMMU is not supported by Amlogic SOCs, the decoder hardware needs to
>> use contiguous memory.
> I assume you speak about hardware, not drivers, so it is fine.
Yes, I mean the IOMMU hardware above.
>
> Best regards,
> Krzysztof

Thank you

Zhentao