linux-kernel - Re: [PATCH] arm64: dts: ti: am62-phyboard-lyra: Add overlay to enable a GPIO fan

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Message-ID: <ynrdlauwefl6ckabxtk5qykeffcyisi6wivlforzbij3sga6uo@xdgewvanjgug>
Date: Thu, 8 Feb 2024 11:32:30 +0530
From: Jai Luthra <j-luthra@...com>
To: Nathan Morrisson <nmorrisson@...tec.com>
CC: <nm@...com>, <vigneshr@...com>, <kristo@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <upstream@...ts.phytec.de>,
        <w.egorov@...tec.de>
Subject: Re: [PATCH] arm64: dts: ti: am62-phyboard-lyra: Add overlay to
 enable a GPIO fan

Hi Nathan,

Thanks for the patch.

On Feb 07, 2024 at 09:28:20 -0800, Nathan Morrisson wrote:
> The phyBOARD-Lyra has a GPIO fan header. This overlay enables the fan
> header and sets the fan to turn on at 65C.
> 
> Signed-off-by: Nathan Morrisson <nmorrisson@...tec.com>
> ---
>  arch/arm64/boot/dts/ti/Makefile               |  1 +
>  .../ti/k3-am62-phyboard-lyra-gpio-fan.dtso    | 51 +++++++++++++++++++
>  2 files changed, 52 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/ti/k3-am62-phyboard-lyra-gpio-fan.dtso
> 
> diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
> index 52c1dc910308..379fb4f31a1f 100644
> --- a/arch/arm64/boot/dts/ti/Makefile
> +++ b/arch/arm64/boot/dts/ti/Makefile
> @@ -23,6 +23,7 @@ dtb-$(CONFIG_ARCH_K3) += k3-am625-verdin-wifi-dev.dtb
>  dtb-$(CONFIG_ARCH_K3) += k3-am625-verdin-wifi-mallow.dtb
>  dtb-$(CONFIG_ARCH_K3) += k3-am625-verdin-wifi-yavia.dtb
>  dtb-$(CONFIG_ARCH_K3) += k3-am62-lp-sk.dtb
> +dtb-$(CONFIG_ARCH_K3) += k3-am62-phyboard-lyra-gpio-fan.dtbo

You can also add a compile time test, to check if this applies cleanly 
on your phyboard base DTB.

Please see the "Build time test only, enabled by CONFIG_OF_ALL_DTBS" 
section below in this file.

>  
>  # Boards with AM62Ax SoC
>  dtb-$(CONFIG_ARCH_K3) += k3-am62a7-sk.dtb
> diff --git a/arch/arm64/boot/dts/ti/k3-am62-phyboard-lyra-gpio-fan.dtso b/arch/arm64/boot/dts/ti/k3-am62-phyboard-lyra-gpio-fan.dtso
> new file mode 100644
> index 000000000000..9c05748bdd9d
> --- /dev/null
> +++ b/arch/arm64/boot/dts/ti/k3-am62-phyboard-lyra-gpio-fan.dtso
> @@ -0,0 +1,51 @@
> +// SPDX-License-Identifier: GPL-2.0-only OR MIT
> +/*
> + * Copyright (C) 2024 PHYTEC America LLC
> + * Author: Garrett Giordano <ggiordano@...tec.com>
> + */
> +
> +/dts-v1/;
> +/plugin/;
> +
> +#include <dt-bindings/gpio/gpio.h>
> +#include <dt-bindings/thermal/thermal.h>
> +#include "k3-pinctrl.h"
> +
> +&{/} {
> +	fan: gpio-fan {
> +		compatible = "gpio-fan";
> +		gpio-fan,speed-map = <0 0 8600 1>;
> +		gpios = <&main_gpio0 40 GPIO_ACTIVE_LOW>;
> +		#cooling-cells = <2>;
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&gpio_fan_pins_default>;
> +		status = "okay";
> +	};
> +};
> +
> +&main_pmx0 {
> +	gpio_fan_pins_default: gpio-fan-default-pins {
> +		pinctrl-single,pins = <
> +			AM62X_IOPAD(0x0a4, PIN_OUTPUT, 7) /* (M22) GPMC0_DIR.GPIO0_40 */
> +		>;
> +	};
> +};
> +
> +&thermal_zones {
> +	main0_thermal: main0-thermal {
> +		trips {
> +			main0_thermal_trip0: main0-thermal-trip {
> +				temperature = <65000>;  /* millicelsius */
> +				hysteresis = <2000>;    /* millicelsius */
> +				type = "active";
> +			};
> +		};
> +
> +		cooling-maps {
> +			map0 {
> +				trip = <&main0_thermal_trip0>;
> +				cooling-device = <&fan THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
> +			};
> +		};
> +	};
> +};
> -- 
> 2.25.1
> 

-- 
Thanks,
Jai

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