linux-kernel - Re: [PATCH v2 2/2] arm64: dts: rockchip: Add rk3528 QoS register node

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Message-ID: <7fa480bd-9bc5-4069-a623-afb140455192@kwiboo.se>
Date: Fri, 7 Mar 2025 00:07:06 +0100
From: Jonas Karlman <jonas@...boo.se>
To: Heiko Stübner <heiko@...ech.de>,
 Chukun Pan <amadeus@....edu.cn>
Cc: Yao Zi <ziyao@...root.org>, Lee Jones <lee@...nel.org>,
 Rob Herring <robh@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 2/2] arm64: dts: rockchip: Add rk3528 QoS register node

On 2025-03-06 19:08, Heiko Stübner wrote:
> Am Donnerstag, 6. März 2025, 17:55:16 MEZ schrieb Jonas Karlman:
>> Hi Chukun,
>>
>> On 2025-03-06 13:38, Chukun Pan wrote:
>>> The Quality-of-Service (QsS) node stores/restores specific
>>> register contents when the power domains is turned off/on.
>>> Add QoS node so that they can connect to the power domain.
>>>
>>> Signed-off-by: Chukun Pan <amadeus@....edu.cn>
>>> ---
>>>  arch/arm64/boot/dts/rockchip/rk3528.dtsi | 160 +++++++++++++++++++++++
>>>  1 file changed, 160 insertions(+)
>>>
> 
>>
>> These QoS node are typically referenced from power domains so that the
>> PMU driver know what QoS to save/restore when a power domain is power
>> cycled.
>>
>> Vendor kernel only reference the two qos_gpu nodes in it's power domains,
>> do you have any documentation or knowledge about what power domain the
>> remaining QoS are related to?
> 
> I think the GPU actually is the _only_ fully switchable power-domain on the
> rk3528. The other powerdomains seem to be always on, but can do this
> idle-request thing.
> 
> At least that is what I'm reading from the pm-domain definitions in the
> vendor-kernel, combined with a look at the pmu section of the rk3528 TRM.

Thanks for this information.

Regards,
Jonas

> 
> 
> Heiko
> 
>