On Mon, Mar 23, 2015 at 02:39:39PM -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@xxxxxx> Acked-by: Eduardo Valentin <edubezval@xxxxxxxxx> > --- > Changes since V1: > - slight change in omap4-cpu-thermal for usage in am57xx-dtsi > - Not carrying forward ack due to change > > V1: http://marc.info/?t=142688102700004&r=1&w=2 > > arch/arm/boot/dts/am57xx-beagle-x15.dts | 49 ++++++++++++++++++++++++++++++ > arch/arm/boot/dts/omap4-cpu-thermal.dtsi | 4 +-- > 2 files changed, 51 insertions(+), 2 deletions(-) > > 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>; > + }; > + }; > + }; > +}; > diff --git a/arch/arm/boot/dts/omap4-cpu-thermal.dtsi b/arch/arm/boot/dts/omap4-cpu-thermal.dtsi > index cb9458feb2e3..ab7f87ae96f0 100644 > --- a/arch/arm/boot/dts/omap4-cpu-thermal.dtsi > +++ b/arch/arm/boot/dts/omap4-cpu-thermal.dtsi > @@ -18,7 +18,7 @@ cpu_thermal: cpu_thermal { > /* sensor ID */ > thermal-sensors = <&bandgap 0>; > > - trips { > + cpu_trips: trips { > cpu_alert0: cpu_alert { > temperature = <100000>; /* millicelsius */ > hysteresis = <2000>; /* millicelsius */ > @@ -31,7 +31,7 @@ cpu_thermal: cpu_thermal { > }; > }; > > - cooling-maps { > + cpu_cooling_maps: cooling-maps { > map0 { > trip = <&cpu_alert0>; > cooling-device = > -- > 1.7.9.5 >
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