linux-kernel - Re: [PATCH v13 07/10] firmware: psci: Implement vendor-specific resets as reboot-mode

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Message-ID: <2a39c0ab-edd4-402c-95a0-a6286f03102a@kernel.org>
Date: Mon, 28 Jul 2025 14:23:14 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Shivendra Pratap <shivendra.pratap@....qualcomm.com>,
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
 Bjorn Andersson <andersson@...nel.org>, Sebastian Reichel <sre@...nel.org>,
 Rob Herring <robh@...nel.org>, Sudeep Holla <sudeep.holla@....com>,
 Souvik Chakravarty <Souvik.Chakravarty@....com>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Andy Yan <andy.yan@...k-chips.com>,
 Mark Rutland <mark.rutland@....com>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>, Arnd Bergmann <arnd@...db.de>,
 Konrad Dybcio <konradybcio@...nel.org>, cros-qcom-dts-watchers@...omium.org,
 Vinod Koul <vkoul@...nel.org>, Catalin Marinas <catalin.marinas@....com>,
 Will Deacon <will@...nel.org>,
 Florian Fainelli <florian.fainelli@...adcom.com>,
 Mukesh Ojha <mukesh.ojha@....qualcomm.com>,
 Stephen Boyd <swboyd@...omium.org>, Andre Draszik
 <andre.draszik@...aro.org>, linux-pm@...r.kernel.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
 Elliot Berman <quic_eberman@...cinc.com>,
 Srinivas Kandagatla <srini@...nel.org>
Subject: Re: [PATCH v13 07/10] firmware: psci: Implement vendor-specific
 resets as reboot-mode

On 28/07/2025 14:03, Dmitry Baryshkov wrote:
>>
>>> and the reboot-mode is defined in the
>>> previous patch. So, I'd assume, the path is defined.
>>
>> As I said, path is not. only psci/reboot-mode is.
> 
> Do we have an _actual_ use case where PSCI node is not at at root node? 

Yes, many cases, because it belongs as well to firmware node.

> If not, it's obviously a deficiency of the schema. Could you please 
> provide suggestions on how to describe that in DT schema?

I do not see deficiency. There is no ABI that psci must be root node, so
there is no issue to fix there.

If you want to add such ABI, I will answer: no, don't, because we do not
want paths or node names to be the ABI.

Compatible is the ABI.

Best regards,
Krzysztof