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thermal: max77620: Add DT binding doc for thermal driver 

Maxim Semiconductor MAX77620 supports alarm interrupts when
its die temperature crosses 120C and 140C. These threshold
temperatures are not configurable.

Add DT binding document to details out the DT property related
to MAX77620 thermal functionality.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
This commit is contained in:
Laxman Dewangan 2016-08-23 13:50:26 +05:30 committed by Zhang Rui
parent 9dfe1a2f9a
commit 94c2004ef5
1 changed files with 70 additions and 0 deletions
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Documentation/devicetree/bindings/thermal/max77620_thermal.txt Normal file
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Thermal driver for MAX77620 Power management IC from Maxim Semiconductor.
Maxim Semiconductor MAX77620 supports alarm interrupts when its
die temperature crosses 120C and 140C. These threshold temperatures
are not configurable. Device does not provide the real temperature
of die other than just indicating whether temperature is above or
below threshold level.
Required properties:
-------------------
#thermal-sensor-cells: Please refer <devicetree/bindings/thermal/thermal.txt>
for more details.
The value must be 0.
For more details, please refer generic thermal DT binding document
<devicetree/bindings/thermal/thermal.txt>.
Please refer <devicetree/bindings/mfd/max77620.txt> for mfd DT binding
document for the MAX77620.
Example:
--------
#include <dt-bindings/mfd/max77620.h>
#include <dt-bindings/thermal/thermal.h>
...
i2c@7000d000 {
spmic: max77620@3c {
compatible = "maxim,max77620";
:::::
#thermal-sensor-cells = <0>;
:::
};
};
cool_dev: cool-dev {
compatible = "cooling-dev";
#cooling-cells = <2>;
};
thermal-zones {
PMIC-Die {
polling-delay = <0>;
polling-delay-passive = <0>;
thermal-sensors = <&spmic>;
trips {
pmic_die_warn_temp_thresh: hot-die {
temperature = <120000>;
type = "hot";
hysteresis = <0>;
};
pmic_die_cirt_temp_thresh: cirtical-die {
temperature = <140000>;
type = "critical";
hysteresis = <0>;
};
};
cooling-maps {
map0 {
trip = <&pmic_die_warn_temp_thresh>;
cooling-device = <&cool_dev THERMAL_NO_LIMIT
THERMAL_NO_LIMIT>;
contribution = <100>;
};
};
};
};