linux-kernel - Re: [RFC PATCH 0/4] Implement a PSCI SYSTEM

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Date:   Tue, 25 Jul 2023 13:27:14 -0700
From:   Elliot Berman <quic_eberman@...cinc.com>
To:     Florian Fainelli <florian.fainelli@...adcom.com>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        "Sebastian Reichel" <sre@...nel.org>
CC:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <kernel@...cinc.com>,
        "Satya Durga Srinivasu Prabhala" <quic_satyap@...cinc.com>,
        Melody Olvera <quic_molvera@...cinc.com>,
        Prasad Sodagudi <quic_psodagud@...cinc.com>
Subject: Re: [RFC PATCH 0/4] Implement a PSCI SYSTEM_RESET2 reboot-mode driver



On 7/25/2023 12:12 PM, Florian Fainelli wrote:
> Hello,
> 
> On 7/24/23 15:30, Elliot Berman wrote:
>> PSCI implements a restart notifier for architectural defined resets.
>> The SYSTEM_RESET2 call allows vendor firmware to define additional reset
>> types which could be mapped to the reboot reason.
>>
>> Implement a driver to wire the reboot-mode framework to make vendor
>> SYSTEM_RESET2 calls on reboot.
>>
>> This is a continuation from 
>> https://lore.kernel.org/all/4a679542-b48d-7e11-f33a-63535a5c68cb@quicinc.com/
> 
> Would appreciate being CC'd on a the non-RFC postings of this patch. 
> FWIW, my use case is better described with this earlier submission:
> 
> https://lore.kernel.org/lkml/20220122035421.4086618-1-f.fainelli@gmail.com/T/#m74e4243c1af3a8d896e19b573b58f562fa09961d
> 
> It would be neat if I could leverage your driver in order to implement 
> this custom "reboot powercycle" implementation. Towards that goal, we 
> would likely need to specify the desired reboot "sub" operation 
> alongside its PSCI SYSTEM_RESET2 reboot type argument?
> 
> Thanks!

I think you you want to describe the PSCI vendor reset under a warm 
reboot with command "powercycle"? In other words, my series only lets DT 
describe either reboot_mode (warm) or cmd (powercycle) but not both 
simultaneously?

Please correct me if I got it wrong! Otherwise, I can incorporate way to 
describe vendor reset type matching both reboot_mode and cmd in the DT.

- Elliot