This adds the tachometer interrupt to the pwm-fan binding, which is necessary for RPM support.
Signed-off-by: Stefan Wahren <[email protected]> --- Documentation/devicetree/bindings/hwmon/pwm-fan.txt | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt index 49ca5d8..7d09623 100644 --- a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt +++ b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt @@ -8,6 +8,14 @@ Required properties: Optional properties: - 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. +- interrupt-ratio : defines the ratio interrupts per fan revolution as an + integer (default is 2 interrupts per revolution) Example: fan0: pwm-fan { @@ -38,3 +46,14 @@ Example: }; }; }; + +Example 2: + fan0: pwm-fan { + fan0: pwm-fan { + compatible = "pwm-fan"; + pwms = <&pwm 0 40000 0>; + fan-supply = <®_fan>; + interrupt-parent = <&gpio5>; + interrupts = <1 IRQ_TYPE_EDGE_FALLING>; + interrupt-ratio = <2>; + }; -- 2.7.4
