[PATCH v2 2/3] arm64: dts: renesas: r8a77960: Add GX6250 GPU node

[Marek Vasut]

On 10/16/25 12:14 PM, Geert Uytterhoeven wrote:

Hello Geert,

>> which are also never disabled, do we want to disable the GPU by default
>> and enable per-board ?
> 
> Yes please. We do the same with renesas,*-mali GPU nodes.
> The board may not even have graphical output.
> Or do you envision using the GPU for more general and headless operation?

The GPU does have GP-GPU compute shader, so even headless system can do 
compute on the GPU.

>> I would argue the GPU should be enabled by default, so the GPU driver
>> can do a proper power management of the GPU. If firmware is missing, at
>> least power it off on failed probe, if nothing else.
> 
> The *_PD_3DG_* domains are powered down anyway when unused.

If the driver was bound to the GPU node, then the domain would be surely 
powered down in control of the Linux kernel driver, without depending on 
the prior stage to leave it powered down.

I think it is in fact better to bind the GPU driver to the GPU IP and 
let the GPU driver power manage the GPU in a well defined manner, 
instead of depending on the prior stage to leave the GPU in some 
specific state ?

-- 
Best regards,
Marek Vasut