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author | Stefan Wahren <stefan.wahren@i2se.com> | 2019-04-11 15:30:09 +0200 |
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committer | Guenter Roeck <linux@roeck-us.net> | 2019-04-15 17:19:53 -0700 |
commit | c7366e951469b542fa16ca94ac6d09ac2206d11a (patch) | |
tree | a4b6b7f4dcb89060f1f539147b7e06c60de1f44d | |
parent | c112d75840fb23e481f3d0db5c8e830391664078 (diff) | |
download | linux-c7366e951469b542fa16ca94ac6d09ac2206d11a.tar.bz2 |
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>
-rw-r--r-- | Documentation/devicetree/bindings/hwmon/pwm-fan.txt | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt index 49ca5d83ed13..6ced829b0e58 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 = <®_fan>; + interrupt-parent = <&gpio5>; + interrupts = <1 IRQ_TYPE_EDGE_FALLING>; + pulses-per-revolution = <2>; + }; |