linux-kernel - Re: [PATCH 1/4] arm64: dts: qcom: sa8775p: pmic: remove the PON modes

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Message-ID: <a17c21b7-9c0a-2458-735c-ac3b16ed337f@linaro.org>
Date:   Tue, 18 Apr 2023 11:43:56 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Shazad Hussain <quic_shazhuss@...cinc.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Sebastian Reichel <sre@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>
Cc:     linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Parikshit Pareek <quic_ppareek@...cinc.com>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH 1/4] arm64: dts: qcom: sa8775p: pmic: remove the PON modes



On 18.04.2023 06:39, Shazad Hussain wrote:
> 
> 
> On 4/13/2023 9:42 PM, Krzysztof Kozlowski wrote:
>> On 13/04/2023 15:17, Bartosz Golaszewski wrote:
>>> From: Parikshit Pareek <quic_ppareek@...cinc.com>
>>>
>>> Remove the power on reasons with reboot from the pmm8654au_0_pon.
>>> Instead, the PoN reaons should be part of different sdam_0 mode, to
>>
>> typo: reasons
>>
>>> be interoduced.
>>
>> introduced
>>
>> Anyway it does not say why. Are these power reasons not correct?
>>
> 
> Hi Krzysztof,
> Since sm8350 the PMIC PON peripheral was split into PON_HLOS and PON_PBS
> to avoid security concerns with HLOS APPS being able to trigger a PMIC
> WARM_RESET unilaterally. When the split occurred, the spare registers
> ended up in PON_PBS, not PON_HLOS. Thus at that time, we moved to using
> an SDAM register for Linux “reboot reason” configuration. And bootloader
> also SDAM register to get these reboot region data to get into
> bootloader/edl, so to have this working we need to use SDAM.
> 
Does that imply all PMICs following the PMK8350 scheme (separate HLOS and
PBS) should direct reboot mode writes to SDAM?

Konrad
>>>
>>> Signed-off-by: Parikshit Pareek <quic_ppareek@...cinc.com>
>>> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
>>> ---
>>
>> Best regards,
>> Krzysztof
>>
> 
> -Shazad