linux-kernel - Re: [PATCH v6 7/7] arm64: dts: sdm845: Add tsens nodes

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Message-ID: <CAP245DV1sYDFHekvVmYq-4vuorO6zSQTz8gPHwfCEPzPyVKPTw@mail.gmail.com>
Date:   Thu, 12 Jul 2018 11:06:04 +0530
From:   Amit Kucheria <amit.kucheria@...aro.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     mka@...omium.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Eduardo Valentin <edubezval@...il.com>,
        smohanad@...eaurora.org,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-soc@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        Lists LAKML <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v6 7/7] arm64: dts: sdm845: Add tsens nodes

On Thu, Jul 12, 2018 at 3:30 AM Doug Anderson <dianders@...omium.org> wrote:
>
> Hi Matthias,
>
> On Wed, Jul 11, 2018 at 2:51 PM, Matthias Kaehlcke <mka@...omium.org> wrote:
> > On Wed, Jul 11, 2018 at 11:44:13AM -0700, Doug Anderson wrote:
> >> Hi,
> >>
> >> On Mon, Jul 9, 2018 at 4:43 AM, Amit Kucheria <amit.kucheria@...aro.org> wrote:
> >> > SDM845 has two tsens blocks, one with 13 sensors and the other with 8
> >> > sensors. It uses version 2 of the TSENS IP, so use the fallback property to
> >> > allow more common code.
> >> >
> >> > Signed-off-by: Amit Kucheria <amit.kucheria@...aro.org>
> >> > ---
> >> >  arch/arm64/boot/dts/qcom/sdm845.dtsi | 16 ++++++++++++++++
> >> >  1 file changed, 16 insertions(+)
> >> >
> >> > diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> >> > index cdaabeb..ba2899c 100644
> >> > --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> >> > +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> >> > @@ -221,6 +221,22 @@
> >> >                         #interrupt-cells = <2>;
> >> >                 };
> >> >
> >> > +               tsens0: tsens@...3000 {
> >>
> >> As per my comments in the bindings, nit that this should probably be
> >> "thermal-sensor" not "tsens", AKA:
> >>
> >> tsens0: thermal-sensor@...3000 {

Fixed.

> >> > +                       compatible = "qcom,sdm845-tsens", "qcom,tsens-v2";
> >> > +                       reg = <0xc263000 0x1ff>, /* TM */
> >> > +                             <0xc222000 0x1ff>; /* SROT */
> >> > +                       #qcom,sensors = <13>;
> >>
> >> As per my comment in the bindings and the code, I'm confused about the
> >> whole "#qcom,sensors" bit.  It's not documented and doesn't seem
> >> hooked up in the code either.
> >>
> >> ...but if people have tested this, perhaps I'm confused.  How can
> >> things work if num_sensors is 0???
> >
> > The mystery is resolved by:
> >
> > commit 6d7c70d1cd6526dc79e3d3b3faae1c40c1681168
> > Author: Bjorn Andersson <bjorn.andersson@...aro.org>
> > Date:   Mon May 7 16:53:39 2018 -0700
> >
> >     thermal: qcom: tsens: Allow number of sensors to come from DT
> >
> >     For platforms that has multiple copies of the TSENS hardware block it's
> >     necessary to be able to specify the number of sensors per block in DeviceTree.
> >
> >     Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> >     Reviewed-by: Amit Kucheria <amit.kucheria@...aro.org>
> >     Reviewed-by: Rob Herring <robh@...nel.org>
> >     Signed-off-by: Eduardo Valentin <edubezval@...il.com>
> >
> >
> > I bumped into this during testing ;-)

I think this was merged in 4.17, so you didn't see it in your tree :-)

> Ah, now it makes sense to me!  Serves me right for assuming it would
> be in the same series and not checking if it was something that had
> already landed.  Thanks.  Please ignore the parts of my comments
> related to the "#qcom,sensors" property.  I guess Rob must have
> thought that the "#" in the name was fine and he's the one in charge
> not me.

Thanks for your review, Doug. I'll test this and post a v7 today. I'd
really like to get this accepted for 4.19 so I can post interrupt
support and some more cleanups.

Regards,
Amit