[PATCH V4 1/3] dt-bindings: hwmon: Add tachometer interrupt to pwm-fan

[Stefan Wahren]

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

Signed-off-by: Stefan Wahren <stefan.wah...@i2se.com>
Reviewed-by: Rob Herring <r...@kernel.org>
---
 Documentation/devicetree/bindings/hwmon/pwm-fan.txt | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt 
b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt
index 49ca5d8..6ced829b 100644
--- a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt
+++ b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt
@@ -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>;
+       };
-- 
2.7.4