linux-kernel - Re: [PATCH 2/4] media: dt-binding: media: Document rk3588’s vepu121

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Message-ID: <70439a01-7949-46bf-a701-c82ba961171a@linaro.org>
Date: Thu, 21 Mar 2024 10:19:54 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Heiko Stübner <heiko@...ech.de>,
 Emmanuel Gil Peyrot <linkmauve@...kmauve.fr>, linux-kernel@...r.kernel.org
Cc: Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
 Philipp Zabel <p.zabel@...gutronix.de>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Joerg Roedel <joro@...tes.org>,
 Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
 Sebastian Reichel <sebastian.reichel@...labora.com>,
 Cristian Ciocaltea <cristian.ciocaltea@...labora.com>,
 Dragan Simic <dsimic@...jaro.org>,
 Shreeya Patel <shreeya.patel@...labora.com>,
 Chris Morgan <macromorgan@...mail.com>, Andy Yan <andy.yan@...k-chips.com>,
 Nicolas Frattaroli <frattaroli.nicolas@...il.com>,
 linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 iommu@...ts.linux.dev
Subject: Re: [PATCH 2/4] media: dt-binding: media: Document rk3588’s vepu121

On 21/03/2024 09:47, Heiko Stübner wrote:
>>>      enum:
>>>        - rockchip,rk3568-vepu
>>> +      - rockchip,rk3588-vepu121
>>
>> What is 121?
> 
> That is the strange naming of the ip block inside the soc.
> 
> I.e. the rk3588 TRM lists a number of different video encoders and decoders:
> - VDPU121 is decoding h.263 and mpeg1,2,4
> - VDPU381 is decoding h.265, h.264 and some more
> - VDPU720 is decoding jpeg
> - VDPU981 decodes AV1
> - VEPU121 is the jpeg encoder above
> - VEPU580 encodes h.264 and h.265
> 
> Each of those are separate IP blocks with their own io-memory, their own
> interrupts and their own iommus, etc.

Thanks for explanation. Short introduction in commit msg would be nice
(e.g. VEPU121, one of two VEPU encoders). OTOH, why not documenting all
of them? Bindings are supposed to be as complete as possible.

Best regards,
Krzysztof