linux-kernel - Re: [PATCH 09/19] arm: dts: qcom: sdx55/sdx65: Fix CPU power-domain-names

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Message-ID: <66f8d957-f7a5-4aec-b8e7-5bcc7ff7f569@oss.qualcomm.com>
Date: Wed, 9 Apr 2025 20:35:29 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Ulf Hansson <ulf.hansson@...aro.org>,
        Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: "Rob Herring (Arm)" <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        "Rafael J. Wysocki"
 <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Liviu Dudau <liviu.dudau@....com>, Sudeep Holla <sudeep.holla@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
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 <nicolas.ferre@...rochip.com>,
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Subject: Re: [PATCH 09/19] arm: dts: qcom: sdx55/sdx65: Fix CPU
 power-domain-names

On 4/7/25 6:27 PM, Ulf Hansson wrote:
> On Fri, 4 Apr 2025 at 22:41, Konrad Dybcio
> <konrad.dybcio@....qualcomm.com> wrote:
>>
>> On 4/4/25 4:59 AM, Rob Herring (Arm) wrote:
>>> "rpmhpd" is not documented nor used anywhere. As the enable-method is
>>> "psci" use "psci" for the power-domain name.
>>>
>>> Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
>>> ---
>>
>> "psci" is what we want here, but these platforms require some more
>> massaging..
> 
> So this isn't for CPU performance scaling?

Nope!

> 
>>
>> These SoCs don't seem to have any PSCI idle states (deeper than WFI)
>> described, which is no bueno, as they support some..
> 
> If PSCI PC mode is the only supported CPU suspend mode, we don't need
> the power-domain topology to be described in DT as it's optional to
> use.
> 
> Is this a PC or OSI based platform?
Unfortunately it seems like only PC mode is implemented.

Konrad