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Message-ID: <120a2b2e-abb9-4476-a175-10f83a322434@linaro.org>
Date: Thu, 6 Jun 2024 11:07:37 +0200
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From: Neil Armstrong <neil.armstrong@linaro.org>
Reply-To: neil.armstrong@linaro.org
Subject: Re: [PATCH v2] arm64: dts: meson: radxa-zero2: add pwm-fan support
To: Christian Hewitt <christianshewitt@gmail.com>,
 Rob Herring <robh+dt@kernel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
 Conor Dooley <conor+dt@kernel.org>, Kevin Hilman <khilman@baylibre.com>,
 Jerome Brunet <jbrunet@baylibre.com>,
 Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
 devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
 linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org
Cc: Yuntian Zhang <yt@radxa.com>
References: <20240606090615.3946433-1-christianshewitt@gmail.com>
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In-Reply-To: <20240606090615.3946433-1-christianshewitt@gmail.com>
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On 06/06/2024 11:06, Christian Hewitt wrote:
> The A311D on Zero2 needs active cooling and the board includes a header to
> connect a simple fan. Add pwm-fan support with basic thermal properties so
> the fan runs when connected.
> 
> Suggested-by: Yuntian Zhang <yt@radxa.com>
> Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
> ---
> Changes since v1: [0]
> - Drop min/max state to comply with bindings
> - Drop ddr_thermal node
> - Add cpu_thermal trips
> - Use cooling map2 to avoid clashing with dtsi inherited maps
> 
> [0] https://patchwork.kernel.org/project/linux-amlogic/patch/20231028075445.3515664-1-christianshewitt@gmail.com/
> 
>   .../dts/amlogic/meson-g12b-radxa-zero2.dts    | 24 +++++++++++++++++++
>   1 file changed, 24 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b-radxa-zero2.dts b/arch/arm64/boot/dts/amlogic/meson-g12b-radxa-zero2.dts
> index 890f5bfebb03..8445701100d0 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-g12b-radxa-zero2.dts
> +++ b/arch/arm64/boot/dts/amlogic/meson-g12b-radxa-zero2.dts
> @@ -33,6 +33,13 @@ memory@0 {
>   		reg = <0x0 0x0 0x0 0x80000000>;
>   	};
>   
> +	fan0: pwm-fan {
> +		compatible = "pwm-fan";
> +		#cooling-cells = <2>;
> +		cooling-levels = <0 64 128 192 255>;
> +		pwms = <&pwm_AO_ab 0 40000 0>;
> +	};
> +
>   	gpio-keys-polled {
>   		compatible = "gpio-keys-polled";
>   		poll-interval = <100>;
> @@ -286,6 +293,23 @@ &cpu103 {
>   	clock-latency = <50000>;
>   };
>   
> +&cpu_thermal {
> +	trips {
> +		cpu_active: cpu-active {
> +			temperature = <70000>; /* millicelsius */
> +			hysteresis = <2000>; /* millicelsius */
> +			type = "active";
> +		};
> +	};
> +
> +	cooling-maps {
> +		map2 {
> +			trip = <&cpu_active>;
> +			cooling-device = <&fan0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
> +		};
> +	};
> +};
> +
>   &frddr_a {
>   	status = "okay";
>   };

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>