linux-kernel - Re: [PATCH V3 3/3] arm64: dts: imx8mp: Add thermal zones support

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Date:   Thu, 2 Apr 2020 16:10:03 +0530
From:   Amit Kucheria <amit.kucheria@...durent.com>
To:     Anson Huang <Anson.Huang@....com>
Cc:     Zhang Rui <rui.zhang@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>, kernel@...gutronix.de,
        Fabio Estevam <festevam@...il.com>, horia.geanta@....com,
        peng.fan@....com, Linux PM list <linux-pm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        lakml <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>, Linux-imx@....com
Subject: Re: [PATCH V3 3/3] arm64: dts: imx8mp: Add thermal zones support

On Mon, Mar 23, 2020 at 6:05 PM Anson Huang <Anson.Huang@....com> wrote:
>
> i.MX8MP has a TMU inside which supports two thermal zones, add support
> for them.
>
> Signed-off-by: Anson Huang <Anson.Huang@....com>


[snip]

>
> +       thermal-zones {
> +               cpu-thermal {
> +                       polling-delay-passive = <250>;
> +                       polling-delay = <2000>;
> +                       thermal-sensors = <&tmu 0x0>;

No need for 0x0, just use 0

> +                       trips {
> +                               cpu_alert0: trip0 {
> +                                       temperature = <85000>;
> +                                       hysteresis = <2000>;
> +                                       type = "passive";
> +                               };
> +
> +                               cpu_crit0: trip1 {
> +                                       temperature = <95000>;
> +                                       hysteresis = <2000>;
> +                                       type = "critical";
> +                               };
> +                       };
> +
> +                       cooling-maps {
> +                               map0 {
> +                                       trip = <&cpu_alert0>;
> +                                       cooling-device =
> +                                               <&A53_0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +                                               <&A53_1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +                                               <&A53_2 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +                                               <&A53_3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
> +                               };
> +                       };
> +               };
> +
> +               soc-thermal {
> +                       polling-delay-passive = <250>;
> +                       polling-delay = <2000>;
> +                       thermal-sensors = <&tmu 0x1>;

No need for 0x1, just use 1

> +                       trips {
> +                               soc_alert0: trip0 {
> +                                       temperature = <85000>;
> +                                       hysteresis = <2000>;
> +                                       type = "passive";
> +                               };
> +
> +                               soc_crit0: trip1 {
> +                                       temperature = <95000>;
> +                                       hysteresis = <2000>;
> +                                       type = "critical";
> +                               };
> +                       };

You need a cooling-map here since you have a passive trip point.


> +               };
> +       };
> +
>         timer {
>                 compatible = "arm,armv8-timer";
>                 interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(6) | IRQ_TYPE_LEVEL_LOW)>,
> @@ -215,6 +271,13 @@
>                                 gpio-ranges = <&iomuxc 0 114 30>;
>                         };
>
> +                       tmu: tmu@...60000 {
> +                               compatible = "fsl,imx8mp-tmu";
> +                               reg = <0x30260000 0x10000>;
> +                               clocks = <&clk IMX8MP_CLK_TSENSOR_ROOT>;
> +                               #thermal-sensor-cells = <1>;
> +                       };
> +
>                         wdog1: watchdog@...80000 {
>                                 compatible = "fsl,imx8mp-wdt", "fsl,imx21-wdt";
>                                 reg = <0x30280000 0x10000>;
> --
> 2.7.4
>