linux-kernel - Re: [PATCH v8 3/5] arm64: dts: qcom: sc7180: Enable SoC sleep stats

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Date:   Mon, 31 May 2021 12:57:03 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Maulik Shah <mkshah@...eaurora.org>, evgreen@...omium.org,
        mka@...omium.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, agross@...nel.org,
        dianders@...omium.org, linux@...ck-us.net, rnayak@...eaurora.org,
        lsrao@...eaurora.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v8 3/5] arm64: dts: qcom: sc7180: Enable SoC sleep stats

On Wed 26 May 18:30 CDT 2021, Stephen Boyd wrote:

> Quoting Maulik Shah (2021-05-21 04:26:09)
> > Add device node for SoC sleep stats driver which provides various
> > low power mode stats.
> >
> > Also update the reg size of aoss_qmp device to 0x400.
> >
> > Cc: devicetree@...r.kernel.org
> > Signed-off-by: Maulik Shah <mkshah@...eaurora.org>
> > Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > ---
> >  arch/arm64/boot/dts/qcom/sc7180.dtsi | 7 ++++++-
> >  1 file changed, 6 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> > index 6228ba2..889d04d 100644
> > --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> > @@ -3215,7 +3215,7 @@
> >
> >                 aoss_qmp: power-controller@...0000 {
> >                         compatible = "qcom,sc7180-aoss-qmp";
> > -                       reg = <0 0x0c300000 0 0x100000>;
> > +                       reg = <0 0x0c300000 0 0x400>;
> >                         interrupts = <GIC_SPI 389 IRQ_TYPE_EDGE_RISING>;
> >                         mboxes = <&apss_shared 0>;
> >
> > @@ -3223,6 +3223,11 @@
> >                         #power-domain-cells = <1>;
> >                 };
> >
> > +               rpmh-sleep-stats@...0000 {
> > +                       compatible = "qcom,rpmh-sleep-stats";
> > +                       reg = <0 0x0c3f0000 0 0x400>;
> > +               };
> > +
> 
> Does this need to be in DT? Can the sc7180-aoss-qmp driver use the
> aux-bus and stick the sleep stats device on there?
> 

The AOSS memory space has N chunks of "message ram", one is used for the
QMP protocol (presumably the APSS specific one), a different one is used
for the sleep stats.

I presume we could have come up with a binding for the entire AOSS/AOP
and then describe (either implicit or explicitly) the QMP and
debug-stats under that.

But we'd also have to come up with the same container-device for the RPM
case.

Regards,
Bjorn

> >                 spmi_bus: spmi@...0000 {
> >                         compatible = "qcom,spmi-pmic-arb";
> >                         reg = <0 0x0c440000 0 0x1100>,