Document and give an example of how to define multiple fan tachometer
inputs for the pwm-fan driver.
Signed-off-by: Paul Barker <pbarker@xxxxxxxxxxxx>
---
.../devicetree/bindings/hwmon/pwm-fan.txt | 28 +++++++++++++------
1 file changed, 19 insertions(+), 9 deletions(-)
diff --git a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt
index 41b76762953a..4509e688623a 100644
--- a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt
+++ b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt
@@ -8,15 +8,16 @@ 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.
-- 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.
+- interrupts : This contains an interrupt specifier for each fan
+ tachometer output connected to 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 number of pulses per fan revolution for
+ each tachometer input as an integer (default is 2
+ interrupts per revolution). The value must be
+ greater than zero.
Example:
fan0: pwm-fan {
@@ -55,3 +56,12 @@ Example 2:
interrupts = <1 IRQ_TYPE_EDGE_FALLING>;
pulses-per-revolution = <2>;
};
+
+Example 3:
+ fan0: pwm-fan {
+ compatible = "pwm-fan";
+ pwms = <&pwm1 0 25000 0>;
+ interrupts-extended = <&gpio1 1 IRQ_TYPE_EDGE_FALLING>,
+ <&gpio2 5 IRQ_TYPE_EDGE_FALLING>;
+ pulses-per-revolution = <2>, <1>;
+ };
--
2.28.0
