[PATCH] arm64: dts: mt8183-kukui: Add trip points to each thermal zone

[Chen-Yu Tsai]

On Thu, Aug 8, 2024 at 5:09 PM Hsin-Te Yuan <yuanhsinte at chromium.org> wrote:
>
> Add trip points to the tboard1 and tboard2 thermal zones to ensure they
> are registered successfully.

The position of tboard_thermistor2 is different between end devices.
And both sensors are outside of the SoC. Having such a high trip point
probably doesn't help with keeping the device or user safe.

The SoC itself also has internal sensors which would be more suited for
this.

So I think it makes more sense to have the kernel not require trip points
for thermal zones, matching what the thermal binding says. I resurrected
an old patch for this [1].


ChenYu

[1] https://lore.kernel.org/linux-arm-kernel/20240809070822.2835371-1-wenst@chromium.org/

> Signed-off-by: Hsin-Te Yuan <yuanhsinte at chromium.org>
> ---
>  arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi b/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
> index 6345e969efae..1593ea14f81f 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
> @@ -978,12 +978,38 @@ tboard1 {
>                 polling-delay = <1000>; /* milliseconds */
>                 polling-delay-passive = <0>; /* milliseconds */
>                 thermal-sensors = <&tboard_thermistor1>;
> +               trips {
> +                       tboard1_alert: trip-alert {
> +                               temperature = <85000>;
> +                               hysteresis = <2000>;
> +                               type = "passive";
> +                       };
> +
> +                       tboard1_crit: trip-crit {
> +                               temperature = <100000>;
> +                               hysteresis = <2000>;
> +                               type = "critical";
> +                       };
> +               };
>         };
>
>         tboard2 {
>                 polling-delay = <1000>; /* milliseconds */
>                 polling-delay-passive = <0>; /* milliseconds */
>                 thermal-sensors = <&tboard_thermistor2>;
> +               trips {
> +                       tboard2_alert: trip-alert {
> +                               temperature = <85000>;
> +                               hysteresis = <2000>;
> +                               type = "passive";
> +                       };
> +
> +                       tboard2_crit: trip-crit {
> +                               temperature = <100000>;
> +                               hysteresis = <2000>;
> +                               type = "critical";
> +                       };
> +               };
>         };
>  };
>
>
> ---
> base-commit: 21b136cc63d2a9ddd60d4699552b69c214b32964
> change-id: 20240801-kukui_trip-6625c0a54c50
>
> Best regards,
> --
> Hsin-Te Yuan <yuanhsinte at chromium.org>
>
>