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dt-bindings: hwmon: (pwm-fan) Add tachometer interrupt 

This adds the tachometer interrupt to the pwm-fan binding, which is
necessary for RPM support.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
hifive-unleashed-5.2
Stefan Wahren 2019-04-11 15:30:09 +02:00 committed by Guenter Roeck
parent c112d75840
commit c7366e9514
1 changed files with 20 additions and 1 deletions
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21
Documentation/devicetree/bindings/hwmon/pwm-fan.txt
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@ -7,7 +7,16 @@ Required properties:
which correspond to thermal cooling states
Optional properties:
- fan-supply : phandle to the regulator that provides power to the fan
- fan-supply : phandle to the regulator that provides power to the fan
- interrupts : This contains a single interrupt specifier which
describes the tachometer output of the fan as an
interrupt source. The output signal must generate a
defined number of interrupts per fan revolution, which
require that it must be self resetting edge interrupts.
See interrupt-controller/interrupts.txt for the format.
- pulses-per-revolution : define the tachometer pulses per fan revolution as
an integer (default is 2 interrupts per revolution).
The value must be greater than zero.
Example:
fan0: pwm-fan {
@ -38,3 +47,13 @@ Example:
};
};
};
Example 2:
fan0: pwm-fan {
compatible = "pwm-fan";
pwms = <&pwm 0 40000 0>;
fan-supply = <&reg_fan>;
interrupt-parent = <&gpio5>;
interrupts = <1 IRQ_TYPE_EDGE_FALLING>;
pulses-per-revolution = <2>;
};