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

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Date:   Wed, 11 Jul 2018 11:44:13 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Amit Kucheria <amit.kucheria@...aro.org>
Cc:     LKML <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>,
        devicetree@...r.kernel.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v6 7/7] arm64: dts: sdm845: Add tsens nodes

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 {

> +                       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???

-Doug