linux-kernel - Re: [PATCH v2 01/22] media: dt-bindings: media: rockchip-rga: add rockchip,rk3588-rga3

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Message-ID: <1db3a9ee-ae09-431f-93ac-680bac088f79@pengutronix.de>
Date: Wed, 3 Dec 2025 22:21:07 +0100
From: Sven Püschel <s.pueschel@...gutronix.de>
To: Krzysztof Kozlowski <krzk@...nel.org>, Jacob Chen
 <jacob-chen@...wrt.com>, Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Heiko Stuebner
 <heiko@...ech.de>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Cc: linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org, kernel@...gutronix.de
Subject: Re: [PATCH v2 01/22] media: dt-bindings: media: rockchip-rga: add
 rockchip,rk3588-rga3

Hi Krzysztof,

On 12/3/25 9:28 PM, Krzysztof Kozlowski wrote:
> On 03/12/2025 16:52, Sven Püschel wrote:
>> Add a new compatible for the RGA3 (Raster Graphic Acceleration 3)
>> peripheral found on the RK3588 SoC.
>>
>> The existing rga node refers to the RGA2 peripheral. The RK3588
> What is "existing rga node"? There is no node here. This is a patch for
> bindings, so you say which hardware existing binding describes and what
> are the differences against that older hardware.
Yeah that is misleading. I refer to the existing binding/compatible 
values of rockchip-rk3xxx-rga which describe the hardware named RGA2 in 
the rk3588 TRM.
>
>> contains one RGA2 core and two RGA3 cores. Both feature a similar
>> functionality of scaling, cropping and rotating of up to two input
>> images into one output image. Key differences of the RGA3 are:
>>
>> - supports 10bit YUV output formats
>> - supports 8x8 tiles and FBCD as inputs and outputs
>> - supports BT2020 color space conversion
>> - max output resolution of (8192-64)x(8192-64)
>> - MMU can map up to 32G DDR RAM
>> - fully planar formats (3 planes) are not supported
>> - max scale up/down factor of 8
> "differences" in meaning nothing above is supported by RGA2?

except the last two points yes. The RGA2 supports fully planar formats 
with 3 planes and can scale up to a factor of 16. For the scaling I can 
add a note to make it more obvious that the RGA3 is worse in this regard.

Sincerely
     Sven

>
>> Signed-off-by: Sven Püschel <s.pueschel@...gutronix.de>
>> ---
> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
>
>
> Best regards,
> Krzysztof
>