linux-kernel - Re: [PATCH 3/3] ARM: dts: am57xx-beagle-x15: Add thermal map

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Date:	Fri, 20 Mar 2015 17:50:22 -0400
From:	Eduardo Valentin <edubezval@...il.com>
To:	Nishanth Menon <nm@...com>
Cc:	Tony Lindgren <tony@...mide.com>,
	Benoît Cousson <bcousson@...libre.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-omap@...r.kernel.org,
	Keerthy <j-keerthy@...com>, Tero Kristo <t-kristo@...com>
Subject: Re: [PATCH 3/3] ARM: dts: am57xx-beagle-x15: Add thermal map

On Fri, Mar 20, 2015 at 02:47:41PM -0500, Nishanth Menon wrote:
> BeagleBoard-X15 has capability for a fan and has an onboard TMP102
> temperature sensor as well. This allows us to create a new thermal
> zone (called, un-imaginatively "board"), and allows us to use some
> active cooling as temperatures start edge upward in the system by
> creating a new alert temperature (emperically 50C) for cpu.
> 
> NOTE: Fan is NOT mounted by default on the platform, in such a case,
> all we end up doing is switch on a regulator and leak very minimal
> current.
> 
> Signed-off-by: Nishanth Menon <nm@...com>

Acked-by: Eduardo Valentin <edubezval@...il.com>

> ---
>  arch/arm/boot/dts/am57xx-beagle-x15.dts |   49 +++++++++++++++++++++++++++++++
>  1 file changed, 49 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/am57xx-beagle-x15.dts b/arch/arm/boot/dts/am57xx-beagle-x15.dts
> index 41642fe770a1..6a3621c23017 100644
> --- a/arch/arm/boot/dts/am57xx-beagle-x15.dts
> +++ b/arch/arm/boot/dts/am57xx-beagle-x15.dts
> @@ -86,6 +86,7 @@
>  		gpios =  <&tps659038_gpio 1 GPIO_ACTIVE_HIGH>;
>  		gpio-fan,speed-map = <0     0>,
>  				     <13000 1>;
> +		#cooling-cells = <2>;
>  	};
>  
>  	extcon_usb1: extcon_usb1 {
> @@ -441,6 +442,7 @@
>  		pinctrl-0 = <&tmp102_pins_default>;
>  		interrupt-parent = <&gpio7>;
>  		interrupts = <16 IRQ_TYPE_LEVEL_LOW>;
> +		#thermal-sensor-cells = <1>;
>  	};
>  };
>  
> @@ -559,3 +561,50 @@
>  &usb2 {
>  	dr_mode = "peripheral";
>  };
> +
> +&cpu_trips {
> +	cpu_alert1: cpu_alert1 {
> +		temperature = <50000>; /* millicelsius */
> +		hysteresis = <2000>; /* millicelsius */
> +		type = "active";
> +	};
> +};
> +
> +&cpu_cooling_maps {
> +	map1 {
> +		trip = <&cpu_alert1>;
> +		cooling-device = <&gpio_fan THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
> +	};
> +};
> +
> +&thermal_zones {
> +	board_thermal: board_thermal {
> +		polling-delay-passive = <1250>; /* milliseconds */
> +		polling-delay = <1500>; /* milliseconds */
> +
> +				/* sensor       ID */
> +		thermal-sensors = <&tmp102     0>;
> +
> +		board_trips: trips {
> +			board_alert0: board_alert {
> +				temperature = <40000>; /* millicelsius */
> +				hysteresis = <2000>; /* millicelsius */
> +				type = "active";
> +			};
> +
> +			board_crit: board_crit {
> +				temperature = <105000>; /* millicelsius */
> +				hysteresis = <0>; /* millicelsius */
> +				type = "critical";
> +			};
> +		};
> +
> +		board_cooling_maps: cooling-maps {
> +			map0 {
> +				trip = <&board_alert0>;
> +				cooling-device =
> +				  <&gpio_fan THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
> +			};
> +		};
> +       };
> +};
> -- 
> 1.7.9.5
> 

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