linux-kernel - Re: [PATCH] arm64: dts: meson: Enable active coling using gpio-fan on Odroid N2/N2+

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Date:   Wed, 19 Oct 2022 12:45:10 +0200
From:   Alexander Stein <alexander.stein@...tq-group.com>
To:     Anand Moon <linux.amoon@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Anand Moon <linux.amoon@...il.com>
Subject: Re: [PATCH] arm64: dts: meson: Enable active coling using gpio-fan on Odroid
 N2/N2+

Am Dienstag, 18. Oktober 2022, 21:51:19 CEST schrieb Anand Moon:
> Odroid N2/N2+ support active cooling via gpio-fan controller.
> Add fan controls and tip point for cpu and ddr thermal sensor
> on this boards.
> 
> Signed-off-by: Anand Moon <linux.amoon@...il.com>
> ---
>  .../dts/amlogic/meson-g12b-odroid-n2.dtsi     | 42 +++++++++++++++++++
>  1 file changed, 42 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dtsi
> b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dtsi index
> fd3fa82e4c33..e61a4285a910 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dtsi
> +++ b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dtsi
> @@ -39,6 +39,14 @@ emmc_pwrseq: emmc-pwrseq {
>  		reset-gpios = <&gpio BOOT_12 GPIO_ACTIVE_LOW>;
>  	};
> 
> +	fan: gpio-fan {
> +		compatible = "gpio-fan";
> +		gpios = <&gpio_ao GPIOAO_10 GPIO_ACTIVE_HIGH>;
> +		/* Using Dummy Speed */
> +		gpio-fan,speed-map = <0 0>, <1 1>;
> +		#cooling-cells = <2>;
> +	};
> +
>  	leds {
>  		compatible = "gpio-leds";
> 
> @@ -410,6 +418,40 @@ &cpu103 {
>  	clock-latency = <50000>;
>  };
> 
> +&cpu_thermal {
> +	trips {
> +		cpu_active: cpu-active {
> +			temperature = <60000>; /* millicelsius */
> +			hysteresis = <2000>; /* millicelsius */
> +			type = "active";
> +		};
> +	};
> +
> +	cooling-maps {
> +		map {
> +			trip = <&cpu_active>;
> +			cooling-device = <&fan THERMAL_NO_LIMIT 
THERMAL_NO_LIMIT>;
> +		};
> +	};
> +};
> +
> +&ddr_thermal {
> +	trips {
> +		ddr_active: cpu-active {

I suspect this node name shall be 'ddr-active', not 'cpu-active'.

Best regards,
Alexander

> +			temperature = <60000>; /* millicelsius */
> +			hysteresis = <2000>; /* millicelsius */
> +			type = "active";
> +		};
> +	};
> +
> +	cooling-maps {
> +		map {
> +			trip = <&ddr_active>;
> +			cooling-device = <&fan THERMAL_NO_LIMIT 
THERMAL_NO_LIMIT>;
> +		};
> +	};
> +};
> +
>  &ext_mdio {
>  	external_phy: ethernet-phy@0 {
>  		/* Realtek RTL8211F (0x001cc916) */
> 
> base-commit: aae703b02f92bde9264366c545e87cec451de471