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 <n...@ti.com>
Acked-by: Eduardo Valentin <edubez...@gmail.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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