[PATCH v6 4/7] arm64: dts: meson: g12: Add minimal thermal zone

Amit Kucheria amit.kucheria at linaro.org
Mon Sep 30 02:44:07 PDT 2019


On Sat, Sep 28, 2019 at 12:14 AM Guillaume La Roque
<glaroque at baylibre.com> wrote:
>
> Add minimal thermal zone for two temperature sensor
> One is located close to the DDR and the other one is
> located close to the PLLs (between the CPU and GPU)
>
> Acked-by: Martin Blumenstingl <martin.blumenstingl at googlemail.com>
> Tested-by: Christian Hewitt <christianshewitt at gmail.com>
> Tested-by: Kevin Hilman <khilman at baylibre.com>
> Signed-off-by: Guillaume La Roque <glaroque at baylibre.com>
> ---
>  .../boot/dts/amlogic/meson-g12-common.dtsi    | 46 +++++++++++++++++++
>  1 file changed, 46 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi b/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
> index 0660d9ef6a86..f98171949fcb 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
> +++ b/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
> @@ -12,6 +12,7 @@
>  #include <dt-bindings/interrupt-controller/arm-gic.h>
>  #include <dt-bindings/reset/amlogic,meson-axg-audio-arb.h>
>  #include <dt-bindings/reset/amlogic,meson-g12a-reset.h>
> +#include <dt-bindings/thermal/thermal.h>
>
>  / {
>         interrupt-parent = <&gic>;
> @@ -94,6 +95,50 @@
>                 #size-cells = <2>;
>                 ranges;
>
> +               thermal-zones {
> +                       cpu_thermal: cpu-thermal {
> +                               polling-delay = <1000>;
> +                               polling-delay-passive = <100>;
> +                               thermal-sensors = <&cpu_temp>;
> +
> +                               trips {
> +                                       cpu_passive: cpu-passive {
> +                                               temperature = <85000>; /* millicelsius */
> +                                               hysteresis = <2000>; /* millicelsius */
> +                                               type = "passive";
> +                                       };
> +
> +                                       cpu_hot: cpu-hot {
> +                                               temperature = <95000>; /* millicelsius */
> +                                               hysteresis = <2000>; /* millicelsius */
> +                                               type = "hot";

critical instead of hot? What is the SoC's critical shutdown temperature?

Typically, you would use 'hot' at the beginning of at up trend e.g. at
75000, 'passive' to start throttling and 'critical' for shutdown
temperature.

> +                                       };
> +
> +                               };
> +                       };
> +
> +                       ddr_thermal: ddr-thermal {
> +                               polling-delay = <1000>;
> +                               polling-delay-passive = <100>;
> +                               thermal-sensors = <&ddr_temp>;
> +
> +                               trips {
> +                                       ddr_passive: ddr-passive {
> +                                               temperature = <85000>; /* millicelsius */
> +                                               hysteresis = <2000>; /* millicelsius */
> +                                               type = "passive";
> +                                       };
> +                               };
> +
> +                               cooling-maps {
> +                                       map {
> +                                               trip = <&ddr_passive>;
> +                                               cooling-device = <&mali THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
> +                                       };
> +                               };
> +                       };
> +               };
> +
>                 ethmac: ethernet at ff3f0000 {
>                         compatible = "amlogic,meson-axg-dwmac",
>                                      "snps,dwmac-3.70a",
> @@ -2412,6 +2457,7 @@
>                         assigned-clock-rates = <0>, /* Do Nothing */
>                                                <800000000>,
>                                                <0>; /* Do Nothing */
> +                       #cooling-cells = <2>;
>                 };
>         };
>
> --
> 2.17.1
>



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