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SubjectRe: [PATCH RFC 1/3] dt-bindings: hwmon: Add tachometer interrupt to pwm-fan
On Wed, Jan 30, 2019 at 04:07:05PM +0100, Stefan Wahren wrote:
> 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>
> ---
> Documentation/devicetree/bindings/hwmon/pwm-fan.txt | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt
> index 49ca5d8..7f69b0b 100644
> --- a/Documentation/devicetree/bindings/hwmon/pwm-fan.txt
> +++ b/Documentation/devicetree/bindings/hwmon/pwm-fan.txt
> @@ -8,6 +8,9 @@ Required properties:
>
> Optional properties:
> - fan-supply : phandle to the regulator that provides power to the fan
> +- interrupts : contains a single interrupt specifier which describes the
> + tachometer pin output of a 2 pulse-per-revolution fan.
> + See interrupt-controller/interrupts.txt for the format.

So a hypothetical {1,4} pulse-per-revolution fan would explicitly not be
supported ? Why ?

Guenter

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