linux-kernel - Re: [PATCH 2/2] arm64: dts: rockchip: rk3588-rock-5b: Add pwm-fan

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Message-ID: <642b134c.4a0a0220.1d01a.5990@mx.google.com>
Date:   Mon, 3 Apr 2023 12:56:26 -0500
From:   Chris Morgan <macroalpha82@...il.com>
To:     Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
Cc:     Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>, linux-hwmon@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH 2/2] arm64: dts: rockchip: rk3588-rock-5b: Add pwm-fan

On Mon, Apr 03, 2023 at 01:50:52PM +0300, Cristian Ciocaltea wrote:
> Add the necessary DT changes for the Rock 5B board to enable support for
> the PWM controlled heat sink fan.

Honest question, but should we be adding this to the board file if not
every device has a PWM fan (they all have the socket for the fan, but
not the fan)? For example I have a passively cooled case that doesn't
include a fan.

Thank you,
Chris Morgan.

> 
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
> ---
>  arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
> index 95805cb0adfa..bd74d9da2c17 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
> @@ -17,6 +17,14 @@ chosen {
>  		stdout-path = "serial2:1500000n8";
>  	};
>  
> +	fan: pwm-fan {
> +		compatible = "pwm-fan";
> +		cooling-levels = <0 95 145 195 255>;
> +		fan-supply = <&vcc5v0_sys>;
> +		pwms = <&pwm1 0 50000 0>;
> +		#cooling-cells = <2>;
> +	};
> +
>  	vcc5v0_sys: vcc5v0-sys-regulator {
>  		compatible = "regulator-fixed";
>  		regulator-name = "vcc5v0_sys";
> @@ -27,6 +35,10 @@ vcc5v0_sys: vcc5v0-sys-regulator {
>  	};
>  };
>  
> +&pwm1 {
> +	status = "okay";
> +};
> +
>  &sdhci {
>  	bus-width = <8>;
>  	no-sdio;
> -- 
> 2.40.0
>