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

[Shazad Hussain]

On 4/18/2023 3:13 PM, Konrad Dybcio wrote:
> 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@xxxxxxxxxxx>
> > > >
> > > > 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

Yes, that's what the expectation is with bootloader using SDAM as well.

> > > > Signed-off-by: Parikshit Pareek <quic_ppareek@xxxxxxxxxxx>
> > > > Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
> > > > ---
> > >
> > > Best regards,
> > > Krzysztof
> >
> > -Shazad

-Shazad