On Sun, Sep 20, 2020 at 07:09:40PM +0100, Paul Barker wrote:
> 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>
> Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
Applied.
Thanks,
Guenter
> ---
> .../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>;
> + };
