linux-kernel - Re: [PATCH v2 1/1] arm64: dts: qcom: sc7180: Add device node support for TSENS in SC7180

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Date:   Thu, 12 Dec 2019 08:59:55 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Amit Kucheria <amit.kucheria@...durent.com>
Cc:     Rajeshwari <rkambl@...eaurora.org>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        sivaa@...eaurora.org, sanm@...eaurora.org
Subject: Re: [PATCH v2 1/1] arm64: dts: qcom: sc7180: Add device node support
 for TSENS in SC7180

Hi,

On Thu, Dec 12, 2019 at 8:56 AM Amit Kucheria
<amit.kucheria@...durent.com> wrote:
>
> On Thu, Dec 12, 2019 at 9:39 PM Doug Anderson <dianders@...omium.org> wrote:
> >
> > Hi,
> >
> > On Thu, Dec 12, 2019 at 3:00 AM Amit Kucheria
> > <amit.kucheria@...durent.com> wrote:
> > >
> > > Hi Rajeshwari,
> > >
> > > On Thu, Nov 28, 2019 at 3:25 PM Rajeshwari <rkambl@...eaurora.org> wrote:
> > > >
> > > > Add TSENS node and user thermal zone for TSENS sensors in SC7180.
> > > >
> > > > Signed-off-by: Rajeshwari <rkambl@...eaurora.org>
> > > > ---
> > > >  arch/arm64/boot/dts/qcom/sc7180.dtsi | 527 +++++++++++++++++++++++++++++++++++
> > > >  1 file changed, 527 insertions(+)
> > > >
> > > > diff --git a/arch/arm64/boot/dts/qcom/sc7180.dtsi b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> > > > index 666e9b9..6656ffc 100644
> > > > --- a/arch/arm64/boot/dts/qcom/sc7180.dtsi
> > > > +++ b/arch/arm64/boot/dts/qcom/sc7180.dtsi
> > > > @@ -911,6 +911,26 @@
> > > >                         status = "disabled";
> > > >                 };
> > > >
> > > > +               tsens0: thermal-sensor@...3000 {
> > > > +                       compatible = "qcom,sc7180-tsens","qcom,tsens-v2";
> > > > +                       reg = <0 0x0c263000 0 0x1ff>, /* TM */
> > > > +                               <0 0x0c222000 0 0x1ff>; /* SROT */
> > > > +                       #qcom,sensors = <15>;
> > > > +                       interrupts = <GIC_SPI 506 IRQ_TYPE_LEVEL_HIGH>;
> > > > +                       interrupt-names = "uplow";
> > > > +                       #thermal-sensor-cells = <1>;
> > > > +               };
> > > > +
> > > > +               tsens1: thermal-sensor@...5000 {
> > > > +                       compatible = "qcom,sc7180-tsens","qcom,tsens-v2";
> > > > +                       reg = <0 0x0c265000 0 0x1ff>, /* TM */
> > > > +                               <0 0x0c223000 0 0x1ff>; /* SROT */
> > > > +                       #qcom,sensors = <10>;
> > > > +                       interrupts = <GIC_SPI 507 IRQ_TYPE_LEVEL_HIGH>;
> > > > +                       interrupt-names = "uplow";
> > > > +                       #thermal-sensor-cells = <1>;
> > > > +               };
> > > > +
> > > >                 spmi_bus: spmi@...0000 {
> > > >                         compatible = "qcom,spmi-pmic-arb";
> > > >                         reg = <0 0x0c440000 0 0x1100>,
> > > > @@ -1121,6 +1141,513 @@
> > > >                 };
> > > >         };
> > > >
> > > > +       thermal-zones {
> > > > +               cpu0-thermal {
> > > > +                       polling-delay-passive = <250>;
> > > > +                       polling-delay = <1000>;
> > > > +
> > > > +                       thermal-sensors = <&tsens0 1>;
> > > > +
> > > > +                       trips {
> > > > +                               cpu0_alert0: trip-point0 {
> > > > +                                       temperature = <90000>;
> > > > +                                       hysteresis = <2000>;
> > > > +                                       type = "passive";
> > > > +                               };
> > > > +
> > > > +                               cpu0_alert1: trip-point1 {
> > > > +                                       temperature = <95000>;
> > > > +                                       hysteresis = <2000>;
> > > > +                                       type = "passive";
> > > > +                               };
> > > > +
> > > > +                               cpu0_crit: cpu_crit {
> > > > +                                       temperature = <110000>;
> > > > +                                       hysteresis = <1000>;
> > > > +                                       type = "critical";
> > > > +                               };
> > >
> > > Where are the cooling maps for all the cpu thermal zones? A passive
> > > trip point w/o a cooling map is not of much use. If you are waiting
> > > for cpufreq support to land before adding them, then remove the
> > > passive trip points for now and add them along with the cooling maps
> > > when you have cooling devices.
> >
> > I will note that cpufreq support has landed in the qcom tree::
> >
> > https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux.git/commit/?h=for-next&id=86899d8235ea0d3d7c293404fb43a6fabff866e6
> >
> > ...so I guess the right thing is to send a patch adding the cooling
> > maps for the cpu thermal zones?
>
> Great, then the cooling maps should be added to this patch itself.

Well, except that this patch itself has also landed:

https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux.git/commit/?h=for-next&id=82bdc93972bf293c3407cb7fdac163aadfbb2c12

...so I think my advice is still correct: the right thing is to send a
patch adding the cooling maps for the cpu thermal zones

-Doug