linux-kernel - Re: [PATCH v3 2/5] arm64: dts: rockchip: enable automatic active cooling on Rock 5B

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Date: Thu, 29 Feb 2024 22:25:10 +0100
From: Dragan Simic <dsimic@...jaro.org>
To: Alexey Charkov <alchark@...il.com>
Cc: Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
 Heiko Stuebner <heiko@...ech.de>, Daniel Lezcano
 <daniel.lezcano@...aro.org>, Viresh Kumar <viresh.kumar@...aro.org>, Chen-Yu
 Tsai <wens@...nel.org>, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/5] arm64: dts: rockchip: enable automatic active
 cooling on Rock 5B

Hello Alexey,

On 2024-02-29 20:26, Alexey Charkov wrote:
> This links the PWM fan on Radxa Rock 5B as an active cooling device
> managed automatically by the thermal subsystem, with a target SoC
> temperature of 65C and a minimum-spin interval from 55C to 65C to
> ensure airflow when the system gets warm

I'd suggest that you replace "automatic active cooling" with "active
cooling" in the patch subject.  I know, it may seem like more of the
unnecessary nitpicking, :) but I hope you'll agree that "automatic"
is actually redundant there.  It would also make the patch subject
a bit shorter.

Another option would be to replace "automatic active cooling" with
"automatic fan control", which may actually be a better choice.
I'd be happy with whichever one you prefer. :)

Otherwise, please feel free to add:

Reviewed-by: Dragan Simic <dsimic@...jaro.org>

> Signed-off-by: Alexey Charkov <alchark@...il.com>
> ---
>  arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts | 30 
> ++++++++++++++++++++++++-
>  1 file changed, 29 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
> b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
> index a0e303c3a1dc..3f7fb055c4dc 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
> @@ -52,7 +52,7 @@ led_rgb_b {
> 
>  	fan: pwm-fan {
>  		compatible = "pwm-fan";
> -		cooling-levels = <0 95 145 195 255>;
> +		cooling-levels = <0 120 150 180 210 240 255>;
>  		fan-supply = <&vcc5v0_sys>;
>  		pwms = <&pwm1 0 50000 0>;
>  		#cooling-cells = <2>;
> @@ -173,6 +173,34 @@ &cpu_l3 {
>  	cpu-supply = <&vdd_cpu_lit_s0>;
>  };
> 
> +&package_thermal {
> +	polling-delay = <1000>;
> +
> +	trips {
> +		package_fan0: package-fan0 {
> +			temperature = <55000>;
> +			hysteresis = <2000>;
> +			type = "active";
> +		};
> +		package_fan1: package-fan1 {
> +			temperature = <65000>;
> +			hysteresis = <2000>;
> +			type = "active";
> +		};
> +	};
> +
> +	cooling-maps {
> +		map1 {
> +			trip = <&package_fan0>;
> +			cooling-device = <&fan THERMAL_NO_LIMIT 1>;
> +		};
> +		map2 {
> +			trip = <&package_fan1>;
> +			cooling-device = <&fan 2 THERMAL_NO_LIMIT>;
> +		};
> +	};
> +};
> +
>  &i2c0 {
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&i2c0m2_xfer>;