diff options
| author | Paul Barker <pbarker@konsulko.com> | 2020-09-20 19:09:40 +0100 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2020-12-02 17:42:23 -0800 |
| commit | 09c7188be3a6b8c141bdf24d31fba9fb078325c3 (patch) | |
| tree | 58157bee5d92811f23cdd40bcf99aec95c8214d4 | |
| parent | bde58ca86df9b4974dddd651a54f0793007d4fac (diff) | |
dt-bindings: hwmon: pwm-fan: Support multiple fan tachometer inputs
Document and give an example of how to define multiple fan tachometer
inputs for the pwm-fan driver.
Signed-off-by: Paul Barker <pbarker@konsulko.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200920180943.352526-2-pbarker@konsulko.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
| -rw-r--r-- | Documentation/devicetree/bindings/hwmon/pwm-fan.txt | 28 |
1 files 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>; + }; |