[PATCH] rockchip: rockpro64: Set cooling levels for pwm-fan

[Peter Robinson]

On Thu, May 28, 2020 at 8:32 PM Kurt Miller <kurt at intricatesoftware.com> wrote:
>
> The cooling levels are tuned to the fan that comes with the rockpro64 NAS
> case. A gpu_thermal zone was not added because having two active cooling
> maps control one physical fan causes them to compete for the fan speed
> which results in erratic fan behavior.

Is there any reason this shouldn't go to the linux kernel first and
then be synced back to the standard rk3399-rockpro64.dtsi?

> Signed-off-by: Kurt Miller <kurt at intricatesoftware.com>
> ---
>
>  arch/arm/dts/rk3399-rockpro64-u-boot.dtsi | 43 +++++++++++++++++++++++
>  1 file changed, 43 insertions(+)
>
> diff --git a/arch/arm/dts/rk3399-rockpro64-u-boot.dtsi b/arch/arm/dts/rk3399-rockpro64-u-boot.dtsi
> index deaa3efd39..c0e0396758 100644
> --- a/arch/arm/dts/rk3399-rockpro64-u-boot.dtsi
> +++ b/arch/arm/dts/rk3399-rockpro64-u-boot.dtsi
> @@ -13,6 +13,49 @@
>         chosen {
>                 u-boot,spl-boot-order = "same-as-spl", &sdmmc, &sdhci;
>         };
> +
> +       fan: pwm-fan {
> +               cooling-levels = <0 40 80 255>;
> +       };
> +};
> +
> +&cpu_thermal {
> +       trips {
> +               cpu_warm: cpu_warm {
> +                       temperature = <50000>;
> +                       hysteresis = <2000>;
> +                       type = "active";
> +               };
> +
> +               cpu_med: cpu_med {
> +                       temperature = <60000>;
> +                       hysteresis = <2000>;
> +                       type = "active";
> +               };
> +
> +               cpu_hot: cpu_hot {
> +                       temperature = <65000>;
> +                       hysteresis = <2000>;
> +                       type = "active";
> +               };
> +       };
> +
> +       cooling-maps {
> +               map2 {
> +                       trip = <&cpu_warm>;
> +                       cooling-device = <&fan THERMAL_NO_LIMIT 1>;
> +               };
> +
> +               map3 {
> +                       trip = <&cpu_med>;
> +                       cooling-device = <&fan THERMAL_NO_LIMIT 2>;
> +               };
> +
> +               map4 {
> +                       trip = <&cpu_hot>;
> +                       cooling-device = <&fan 2 THERMAL_NO_LIMIT>;
> +               };
> +       };
>  };
>
>  &vdd_center {
> --
> 2.26.2
>