linux-kernel - Re: [PATCH 3/7] dt-bindings: media: Document STM32MP25 VENC video encoder

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Message-ID: <fa0e6187-ab7d-bc23-299c-a491c8ff1d8f@foss.st.com>
Date:   Mon, 9 Oct 2023 16:24:59 +0200
From:   Hugues FRUCHET <hugues.fruchet@...s.st.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        <linux-media@...r.kernel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-rockchip@...ts.infradead.org>
CC:     Andrzej Pietrasiewicz <andrzej.p@...labora.com>
Subject: Re: [PATCH 3/7] dt-bindings: media: Document STM32MP25 VENC video
 encoder

Hi Krzysztof,

On 10/9/23 15:56, Krzysztof Kozlowski wrote:
> On 09/10/2023 15:49, Hugues FRUCHET wrote:
>> Hi Krzysztof,
>>
>> On 10/5/23 21:45, Krzysztof Kozlowski wrote:
>>> On 04/10/2023 11:15, Hugues Fruchet wrote:
>>>> Add STM32MP25 VENC video encoder bindings.
>>>>
>>>
>>> I don't understand why this binding is separate from video decoder.
>>> Merge them.
>> VDEC and VENC are two independent IPs with their own clock, reset,
>> interrupt & register set, they have their own access to APB/AXI bus.
>> Moreover future chipsets may embed only VENC or VDEC.
>>
>> Hoping that this clarifies the reason of two different bindings.
> 
> No, it does not. These are no reasons to have independent bindings,
> except when having actual impact on the bindings. The bindings look
> identical. What are the differences?
I'm sorry but I really don't understand your point, these are two 
different IPs with very different registers in it, so why should
I share that in a single binding ?

> 
> Best regards,
> Krzysztof
> 

BR,
Hugues.